Publications

Setifi, F.; Setifi, Z.; Geiger, D. K.; Al-Douh, M. H.; Addala, A. “catena-Poly[[(8-aminoquinoline)cobalt(II)]-di-μ-azido].” IUCrData 2024, 9, x240849.

Merabet, L.; Setifi, Z.; Ferjani, H.; Geiger, D. K.; Glidewell, D. K.; Kanmazalp, S. D.; Setifi, F.; Kaboul, L.  "Dinuclear Azide-Bridged Copper(II) Polymer With Azido···π(pyridiyl) Interaction: Synthesis, Crystal Structure and Hirshfeld Surface Analysis." J Chem Crystallogr 53, 209-216 (2023). https://doi.org/10.1007/s10870-022-00960-2

Saadallah, Y., Setifi, Z., Geiger, D. K., Al-Douh, M. H., Satour, A. & Setifi, F. “trans-Bis(2,2′-di­pyridyl­amine-κ²N,N′)­bis­(1,1,3,3-tetra­cyano-2-eth­oxy­propenido-κN)copper(II).” IUCrData 2022, 7, x221180.

Setifi, Z.; Bern`es, S.;  Geiger, David K.; Setifi, Fatima;  Reedijk, J.  "Concomitant dimorphism in poly[di-μ-azido-(5,5 -dimethyl-2,2 -bipyridine)iron(II)]." Acta Cryst. 2022, C78, 449-454.

Benamara, N.; Setifi, Z.; Yang, C.-I; Bernès, S.; Geiger, D.K.; Kürkçüo ˘glu, G.S.; Setifi, F.; Reedijk, J. “Coexistence of Spin Canting and Metamagnetism in a One-Dimensional Mn(II) Compound Bridged by Alternating Double End-to-End and Double End-On Azido Ligands and the Analog Co(II) Compound.” Magnetochemistry 2021, 7, 50. https://www.mdpi.com/2312-7481/7/4/50

Singh, V. P.; Dowarah, J., Lalhruaizela, Geiger, D. K. "Structural and Non-Covalent Interactions Study of 2-Pyridone Based Flexible Unsymmetrical Dimer." Cryst. Res. & Technol. 2019 https://doi.org/10.1002/crat.201900136.

Prajina, O. K.; Bouacida, S.; Geiger, D. K.; Merazig, H.; Muthiah, P. T. “Crystal structure and supramolecular architectures of uranyl organic hybrid material with 3-chlorothiophene-2-carboxylic acid.” Proceedings of the International Conference on Advanced Materials AIP Conference Proceedings 2162, 020059 (2019); https://doi.org/10.1063/1.5130269.

Addala, A; Geiger, D. K.; Setifi, Z.; Setifi, F. “Hydrogen bonding and π–π interactions in the cocrystal salt [Fe(bpe)₂(H₂O)₄](TCEP)₂·2(bpe) [bpe is trans-1,2-bis(pyridin-4-yl)ethene and TCEP is 1,1,3,3-tetracyano-2-ethoxypropenide].” Acta Cryst. 2019, C75, 348-353.

Powers, K. A.; Geiger, D. K. “Hydrogen bonding in two benzene-1,2-diaminium pyridine-2-carboxylate salts and a cocrystal of benzene-1,2-diamine and benzoic acid.” Acta Cryst. 2019, C75, 329-335.

Geiger, D. K.; Geiger, H. C.; Moore, S. M. "Intermolecular interactions in a phenol-substituted benzimidazole."  Acta Cryst. 2019, E75, 272-276.

Zick, P. L.; Geiger, D. K. "Charge-assisted hydrogen bonding in three diaminobenzene salts."  Acta Cryst. 2018, C74, 1725-1731.

Setifi, Z.; Geiger, D.; Jelsch, C.; Maris, T.; Glidewell, C.; Mirzaei, M.; Arefian, M.; Setifi, F. "The first Fe(II) complex bearing end-to-end dicyanamide as a double bridging ligand:  Crystallography study and Hirschfeld surface analysis; completed with a CSD survey." J. Mol. Struct. 2018, 1173, 697-706.

Seye, D.; Diop, C. A. K.; Diop, L.; Geiger, D. K. “[Crystal and molecular structure of] diisopropylammonium benzenesulfonate.” IUCRData 2018, 3, x180876.

Seye, D.; Diop, L.; Diop, C. A. K.; Geiger, D. K. "[Crystal and molecular structure of] diisopropylammonium hydrogen phthalate." IUCrData 2018, 3, x180704.

Geiger, D. K.; Geiger, H. C.; Morell, D. L. "An exploration of O—H...O and C—H...π interactions in a long-chain-ester-substituted phenylphenol: methyl 10-[4-(4-hydroxyphenyl)phenoxy]decanoate."  Acta Cryst. 2018, E74, 594-599.

Geiger, H. C.; Geiger, D. K.; Roberts, W. R.; Morell, D. L.; Huttunen, P.; Schulman, J. L.; Tran, M.; Farthing, D. "Non-steroidal biphenyl gelators:  Correlation of xerogel structure with solid-state structure and circular dichroism spectroscopy." Gels 2018, 4, 34. doi:10.3390/gels4020034

DeStefano, M. R.; Geiger, D. K. CCDC 1486767: CSD Communication, 2017.

Geiger, D. K.; DeStefano, M. R.; Lewis, Robert A. "Structural characterization of two solvates of a luminescent copper(II) bis(pyridine)-substituted benzimidazole complex."  Acta Cryst. 2017, E73, 1616-1621.

Geiger, D. K.; Geiger, H. C.; Moore, S. M.; Roberts, W. R. "Structural characterization, gelation ability, and energy-framework analysis of two bis(long-chain ester)-substituted 4,4'-biphenyl compounds." Acta Cryst. 2017, C73, 791-796.

DeStefano, M. R.; Geiger, D. K. "A luminescent bis(pyridyl)-substituted benzimidazole platinum(II) complex exhibiting an intermolecular anagostic interaction." Acta Cryst. 2017, C73, 697-702.

Geiger, H. C.; Zick, P. L.; Roberts, W. R.; Geiger, D. K. “Synthesis and characterization of a novel long-alkyl-chain ester-substituted benzimidazole gelator and its octan-1-ol solvate.”  Acta Cryst. 2017, C73, 350-356.

Martens, S. J.; Geiger, D. K. "Structural characterization of two tetrachloridozincate salts of 4-carboxy-1H-imidazol-3-ium:  a salt hydrate and a co-crystal salt hydrate."  Acta Cryst. 2017, E73, 162-167.

Geiger, D. K.; Parsons, D. E.; Pagano, B. A. "Two cadmium coordination polymers with bridging acetate and phenylenediamine ligands that exhibit two-dimensional layered structures."  Acta Cryst. 2016, E72, 1718-1723.

Geiger, D. K.; DeStefano, M. R. “Conformational differences and intermolecular C—H···N interactions in three polymorphs of a bis(pyridinyl)-substituted benzimidazole.” Acta Cryst. 2016, C72, 867-874.

Prajina, O.; Thomas Muthiah, P.; Geiger, D. K. "Supramolecular interactions in the 1:2 co-crystal of 4,4'-bipyridine and 3-chlorothiophene-2-carboxylic acid." Acta Cryst. 2016, E72, 1362-1365.

Zick, P. L.; Geiger, D. K. “Structural characterization of two benzene-1,2-di­amine complexes of zinc chloride: a mol­ecular compound and a co-crystal salt.”  Acta Cryst. 2016, E72, 1037-1042.

DeStefano, M. R.; Geiger, D. K. "Structural and spectroscopic characterization of two new blue luminescent pyridylbenzimidazole zinc(II) complexes." Acta Cryst. 2016, C72, 491-497.

Setifi, F.; Geiger, D. K.; Razak, I. A.; Setifi, Z. "Multiple N—H· · ·NC, C—H· · ·NC and nitrile· · ·π interactions in 4,4-bipyridine-1,1-diium bis(1,1,3,3-tetracyano-2-ethoxypropenide): structure determination and DFT calculations of anion· · ·π cation interaction energies." Acta Cryst. 2015, C71, 658-663.

Geiger, D. K.; Parsons, D. E.; Zick, P. L. "Crystal structures of three lead(II) acetate-bridged diaminobenzene coordination polymers.” Acta Cryst. 2014, E70, 566-572.

Geiger, D. K.; Geiger, H. C.; Deck, J. M. "Structure determination of three furan-substituted benzimidazoles and calculation of π^…π and C-H^…π interaction energies." Acta Cryst. 2014, C70, 1125-1132.

Geiger, D. K.; Parsons, D. E. "Hydrogen bonding in 4-nitrobenzene-1,2-diamine and two hydrohalide salts." Acta Cryst. 2014, C70, 681-688.

Geiger, D. K.; Parsons, D. E. "[The crystal and molecular structure of] Poly[[tris(κ²-acetato-κ²-O:O)(4-chlorobenzene-1,2-diamine-κN)(κ³-hydroxido)dizinc] ethanol monosolvate]." Acta Cryst. 2014, E70, m247-m248.

Geiger, D. K.; Isaac, A. L. “[The crystal and molecular structure of] 5,6-Dimethyl-2-(5-methylthiophen-2-yl)-1-[(5-methylthiophen-2-yl)methyl]-1H-benzimidazole,” Acta Cryst. 2014, E70, o488-0489.

Geiger, H. C.; Donohoe, J. S.; Geiger, D. K. “[The crystal and molecular structure of] 4-Bromo-2-(5-bromothiophen-2-yl)-1-[(5-bromothiophen-2-yl)methyl]-5,6-dimethyl-1H-benzimidazole,” Acta Cryst. 2014, E70, o486-o487.

Geiger, D. K.; DeStefano, M. R. "[The crystal and molecular structure of] 5,6-Dimethyl-2-(pyridin-2-yl)-1-[(pyridin-2-yl)methyl]-1H-benzimidazole,” Acta Cryst. 2014, E70, o365.

Geiger, D. K.; Nellist, M. R. "[The Crystal and Molecular Structure of] 5-Chloro-2-(thiophen-2-yl)-1-(thiophen-2-ylmethyl)-1H-benzimidazole--6-Chloro-2-(thiophen-2-yl)-1-(thiophen-2-ylmethyl)-1H-benzimidazole (0.94:0.06)," Acta Cryst. 2013, E69, o1539-o1540.

Geiger, D. K.; Geiger, H. C.; Szczesniak, L. M. "[The crystal and molecular structure of] Thiophene-2-carbaldehyde azine." Acta Cryst. 2013, E69, o916.

Geiger, D. K.; Bond, C. J. "[The crystal and molecular structure of] 2-(Pyridin-4-yl)-1H-benzimidazole." Acta Cryst. 2013, E69, o869.

Geiger, D. K.; Nellist, M. R. "[The Crystal and Molecular Structure of] 6-Chloro-2-(thiophen-2-yl)-1-(thiophen-2-ylmethyl)-1H-benzimidazole," Acta Cryst. 2013, E69, o807.

Geiger, D. K.; Parsons, D. E. "An orthorhomic form of 3,4-diaminobenzonitrile," Acta Cryst. 2013, E69, o658.

Geiger, D. K.; Parsons, D. E. "[The Crystal and Molecular Structure of] 3,4-diaminobenzonitrile," Acta Cryst. 2013, E69, o452.

Geiger, D. K.; DeStefano, M. R. "[The Crystal and Molecular Structure of] 5-Bromo-2-(thiophen-2-yl)-1-(thiophen-2-ylmethyl)-1H-benzimidazole," Acta Cryst. 2012, E68, o3123.

Geiger, D. K.; Geiger, H. C.; Deck, J. S. "[The Crystal and Molecular Structure of] 2-(Furan-2-yl)-1,3-bis(furan-2-ylmethyl)-1H-benzimidazol-3-ium chloride monohydrate," Acta Cryst. 2012, E68, o3006-o3007.

Geiger, D. K.; Geiger, H. C.; Donohoe, J. S. "[The Crystal and Molecular Structure of] 2-Amino-5-nitro-N-[(E)-thiophen-2-ylmethylidene]aniline]," Acta Cryst. 2012, 6E8, o2867.

Geiger, D. K. "[The Crystal and Molecular Structure of] bis(acetato-κO)bis(4,5-dimethylbenzene-1,2-diamine-κN)zinc," Acta Cryst. 2012, E68, m1040.

Geiger, D. K.; Geiger, H. C.; Williams, L.; Noll, B. C. “[The Crystal and Molecular Structure of] 2-(Thiophen-2-yl)-1-(thiophen-2-ylmethyl)-1H-benzimidazole,” Acta Cryst. 2012, E68, o420.

Geiger, H. C.; Geiger, D. K.; Baldwin, C. "Synthesis, Photophysical Characterization, and Gelation Studies of a Stilbene-Cholesterol Derivative: An Advanced Physical Organic Chemistry Laboratory," J. Chem. Ed. 2006, 83, 106-109.

Streit, B. R.; Geiger, D. K. "Structure and Bonding in Group 14 Congeners of Ethene: DFT Calculations in the Inorganic Chemistry Laboratory," J. Chem. Ed. 2005, 82, 111-115.

Huynh, M. H. V.; Smyth, J.; Wetzler, M.; Mort, B.; Gong, P. K.; Witham, L. M.; Jameson, D. L.; Geiger, D. K.; Lasker, J. M.; Charepoo, M.; Gornikiewicz, M.; Cintron J. M.; Imahori, G.; Sanchez, R. R.; Marschilok, A. C.; Krajikowski, L. M.; Churchill, D. G.; Churchill, M. R.; Takeuchi, K. J. "Remarkable Rate Enhancement of Ligand Substitution Promoted by Geometrical Arrangement of Tridentate ‘Spectator' Ligands," Angew. Chem. Int. Ed. 2001, 40, 4469-4473.

Hissler, M; McGarrah, J. E.; Connick, W. B.; Geiger, D. K.; Cummings, S. D.; Eisenberg, R. "Platinum Diimine Complexes: Toward A Molecular Photochemical Device." Coord. Chem. Rev. 2000, 208, 115-137.

Hissler, M. Connick, W. B.; Geiger, D. K.; McGarrah, J. E.; Lipa, D.; Lachicotte, R. J.; Eisenberg, R. "Platinum Diimine Bis(acetylide) Complexes: Synthesis, Characterization and Luminescence Properties," Inorg. Chem. 2000, 39, 447-457.

Connick, W. B.; Geiger, D. K.; Eisenberg, R. "Excited-State Self-Quenching Reactions of Square Planar Platinum(II) Diimine Complexes in Room-Temperature Fluid Solution." Inorg. Chem. 1999, 38, 3264-3265 .

Geiger, D. K. "Chromium--1996 Review." Coord. Chem. Rev. 1998, 172, 157-180.

Paw, W.; Cummings, S. D.; Monsour, M. A.; Connick, W. B.; Geiger, D. K.; Eisenberg, R. "Luminescent Platinum Complexes: Tuning and Using the Excited State." Coord. Chem. Rev. 1998, 171, 125-150.

Geiger, D. K. "Chromium--1995 Review." Coord. Chem. Rev. 1997, 164, 261-288.

Geiger, D. K. "Chromium--1994 Review." Coord. Chem. Rev. 1996, 152, 359-392.

Scheidt, W. R.; Geiger, D. K.; Lee, Y. J.; Gans, P.; Marchon, J-C. "Two Salts of Bis­(ethanol)­(meso-tetraphenyl­porphinato)iron(III). Molecular Structures and Magnetic Susceptibility." Inorg. Chem. 1992, 31, 2660-2663.

Geiger, D. K.; Schmidt, R. G. "The Synthesis of Water-Soluble Hemiporphyrazine Analogues." Inorg. Chim. Acta 1992, 197, 203-207.

Geiger, D. K. "Axial Ligand Effects on the Spin State and Electrochemistry of Iron Porphyrins: An Advanced Laboratory Experiment." J. Chem. Ed. 1991, 68, 340-342.

Geiger, D. K.; Pavlak. E. J.; Kass, L. T. "The Determination of Axial Ligand Binding Constants for Iron Porphyrins by Cyclic Voltammetry." J. Chem. Ed. 1991, 68, 337-339.

Povlock, S. L.; Dennis, L. A.; Geiger, D. K. "The Effect of Mixed Phthalocyanine-Porphyrin Aggregation on the Photoreduction of Manganese Porphyrins." Inorg. Chim. Acta 1990, 176, 295-298.

Povlock, S. L.; Geiger, D. K. "Mixed Porphyrin-Phthalocyanine Aggregates." Proc. 4th Nat. Conf. Undergrad. Res. 1990, 1, 330-335.

Geiger, D. K.; Dennis, L. A.; Boiani, J. A. "Photochemistry of Mixed Porphyrin-Phthalocyanine Aggregates." J. Inorg. Biochem. 1989, 36, 236.

Geiger, D. K.; Kelly C. A. "Mixed Aggregates of Phthalocyanines and Porphyrins Bearing Oppositely Charged Substituents." Inorg. Chim. Acta. 1988, 154, 137-140.

Scheidt, W. R.; Geiger, D. K.; Lee, Y. J.; Reed, C. A.; Lang, G. "On the Preparation of Five-Coordinate Mono(3-chloropyridine)porphinatoiron(III) Complexes." Inorg. Chem. 1987, 26, 1039-1045.

Gupta, G. P.; Lang, G.; Scheidt, W. R.; Geiger, D. K.; Reed, C. A. "Susceptibility and Mossbauer Study of Coupled Admixed-Spin State in [Fe(OEP)(3-ClPy)]⁺ Dimers." J. Chem. Phys. 1986, 25, 5212-5220.

Geiger, D. K.; Ferraudi, G. J. "Reductive Addition of OH Radicals to Macrocyclic Complexes." Inorg. Chim. Acta 1986, 117, 139-144.

Frink, M. E.; Geiger, D. K.; Ferraudi, G. J. "Excimer Formation from Triplet-Triplet Annihilation Reactions of the Lowest-Lying Triplet Excited State in Aluminum(III), Silicon(IV), and Metal-Free Phthalocyanines: Medium and Magnetic Field Effects on the Rate of Reaction." J. Phys. Chem. 1986, 90, 1924-1927.

Geiger, D. K.; Chunplang, V.; Scheidt, W. R. "Control of Spin State in (Porphinato)iron(III) Complexes. A new Crystalline Phase of (Isothiocyanato)-(pyridine)(meso-tetraphenylporphin­ato)iron(III) with Two Magnetically Distinct Sites." Inorg. Chem. 1985, 24, 4736-4741.

Kutal, C.; Weber, M. A.; Ferraudi, G.; Geiger, D. K. "A Mechanistic Investigation of the Photoinduced Reduction of Carbon Dioxide Mediated by Tricarbonyl(2,2'-bipyridine)­rhenium(I)." Organometallics 1985, 4, 2161-2166.

Gupta, G. P.; Lang, G.; Scheidt, W. R.; Geiger, D. K.; Reed, C. A. "Mossbauer and Susceptibility Study of Inter-heme Coupling in [Fe(OEP)(2-MeHIm)]+ Dimers." J. Chem. Phys., 1985, 83, 5945-5952.

Scheidt, W. R.; Geiger, D. K.; Lee, Y. J.; Lang, G.; Reed, C. A. "The Characterization of Five-Coordinate Monoimidazole(Porphinato)iron(III) Complexes." J. Am. Chem. Soc. 1985, 107, 5693-5699.

Geiger, D. K.; Ferraudi, G.; Madden, K.; Granifo, J.; Rillema, D. P. "Redox Reactivity of Transition Metal Phthalocyanines: Ligand Radical Formation vs Metal Center Oxidation." J. Phys. Chem. 1985, 89,3890-3894.

Geiger, D. K.; Ferraudi, G. "Photochemistry of Cu-Olefin Complexes: A Flash Photochemical Investigation of the Reactivity of Cu(ethylene)⁺ and Cu(cis,cis-1,5-cyclooctadiene)²⁺." Inorg. Chim. Acta 1985, 101, 197-201.

Geiger, D. K.; Lee, Y. J.; Scheidt, W. R. "Control of Spin State in (Porphinato)iron(III) Complexes. An Axial Ligand Effect on the Spin State in Bis(2-methylimidazole)­(octaethylporphinato)iron(III) Perchlorate." J. Am. Chem. Soc. 1984, 106, 6339-6343.

Geiger, D. K.; Scheidt, W. R. "Control of Spin State in (Porphinato)iron(III) Complexes. Effect of the Porphyrin Ligand." Inorg. Chem. 1984, 23, 1970-1972.

Scheidt, W. R.; Geiger, D. K.; Hayes, R. G.; Lang, G. "Control of Spin State in Porphinatoiron(III) Complexes. An Axial Ligand Orientation Effect Leading to an Intermediate Spin Complex. Molecular Structure and Physical Characterization of the Monoclinic form of Bis(3-chloropyridine)(octaethylporphinato)iron(III) Perchlorate." J. Am. Chem. Soc. 1983, 105, 2625-2632.

Scheidt, W. R.; Lee, Y. J.; Geiger, D. K.; Taylor, K.; Hatano, K. "Preparation and Molecular Stereochemistry of Six-Coordinate Isothiocyanato(meso-tetraphenyl­porphinato)­(pyridine)­iron(III), A Low-Spin Complex with a Nonlinear Fe-N-C-S Group, and Isothiocyanato­(octa­ethyl­porphin­ato)(pyridine)iron(III), A High-Spin Complex with Nonequivalent Axial Ligands." J. Am. Chem. Soc. 1982, 104, 3367-3374.

Scheidt, W. R.; Geiger, D. K. "Molecular Stereochemistry of a Low-Spin Five-Coordinate Iron(II) Porphyrinate. (Thiocarbonyl)(octaethylporphinato)iron(II)." Inorg. Chem. 1982, 21, 1208-1211.

Scheidt, W. R.; Geiger, D. K.; Haller, K. J. "Structural Characterization of a Variable Spin (Porphinato)iron(III) Complex. Molecular Stereochemistry of Bis(3-chloropyridine)­(octaethyl­porphinato)iron(III) Perchlorate at 98 K (S = 1/2) and 293 K (S = 1/2, S = 5/2)." J. Am. Chem. Soc. 1982, 104, 495-499.

Scheidt, W. R.; Geiger, D. K.; Haller, K. J. "Iron(III) Porphyrin Structural Changes Accompanying the Low-Spin to High-Spin Transition." in "Electron Transport and Oxygen Utilization," Ho, C. et al., Eds.; Elsevier/North Holland: New York, 1981.

Scheidt, W. R.; Geiger, D. K. "Molecular Stereochemistry and Crystal Structure of a 'Spin-Equilibrium' (S = 1/2, S = 5/2) Heamichrome Salt: Bis(3-chloropyridine)(octaethylpor­phin­ato)­iron(III) Perchlorate." J. Chem. Soc., Chem. Commun. 1979, 1154-1155.

Papers Presented

Powers, K.; Geiger, D. K. “Salt formation vs. co-crystallization: an exploration of the ΔpK_a rule for a series of aromatic acids and bases.” 255th ACS National Meeting and Exposition, March 18-22, 2018, New Orleans, LA.

Prajina, O. K.; Muthiah, P. T.; Bouacida, S.; Geiger, D. K.; Merazig, H. “Supramolecular interactions in (acridinium) tris(3-chlorothiophene-2-carboxylato)dioxidouranate(VI) monohydrate.”  International Conference on Chemical and Environmental Research (ICCER), Jamal Mohamed College, Tiruchirappalli, Tamil Nadu, India, January 7, 2017.

Zick, P. L; Geiger, D. K. “Structural Characterization of the Reaction Products of Zinc Chloride and Two Phenylenediamines.”  251^st ACS National Meeting and Exposition, March 14-17, 2016, San Diego, CA.

Geiger, D. K.; Geiger, H. C. “Crystallographic characterization of three furan-substituted benzimidazoles and calculation of C-H/π and π/π interaction energies.”  249^th ACS National Meeting, March 22-26, 2015, Denver, CO.

Prajina, O. K.; Muthiah, P. T.; Geiger, D. K. “Synthesis, spectral studies and structural characterization of a 5,5’-dimethyl-2,2’-bipyridine complex with thorium(IV).”  National Symposium on X-ray Diffraction and Recent Advances in Crystallography (XDRAC-2015), February 27-28, 2015, Tamil Nadu, INDIA.

Geiger, H. C.; Geiger, D. K. “Synthesis and Spectroscopic Characterization of Chiral Biphenyl-Cholesterol Gels.” 26th International CHIRALITY Conference, July 27-30, 2014, Prague, Czech Republic.

Parsons, D. E.; Geiger, D. K. “Structural characterization of novel acetato-bridged (benzene-1,2-diamine-kN)lead(II) complexes.”  247th ACS National Meeting & Exposition, March 16-21, 2014, Dallas, TX

Destefano, M. R.; Nellist, M. R.; Geiger, D. K. "Synthesis and structural characterization of new benzimidazole derivatives," 245th National Meeting of the American Chemical Society, New Orleans, LA, April 7-11, 2013.

Nellist, M. R.; Geiger, D. K. "Crystal and molecular structures of two novel chloro-substituted benzimidazole derivatives," Northeastern Regional Meeting of the American Chemical Society, Rochester, NY, October 1-3, 2012.

Destefano, M. R.; Geiger, D. K. "Synthesis and characterization of new di-substituted benzimidazole derivatives,"   Northeastern Regional Meeting of the American Chemicl Society, Rochester, NY, October 1-3, 2012.

Ludwig, K.; Geiger, D. K. "Use of Job's plots to explore the formation of bridged iron porphyrins," Northeastern Regional Meeting of the American Chemicl Society, Rochester, NY, October 1-3, 2012.

Nellist, M. R.; Yarmosh, D.; Bernhardt, C.; Albucher, J.; Geiger, D. K. "Chemical analysis of soil samples from an ancient Mayan site in the Yucatan Peninsula," Northeastern Regional Meeting of the American Chemicl Society, Rochester, NY, October 1-3, 2012.

Geiger, D. K. "DFT Calculations in the Undergraduate Curriculum: Project Oriented Assignments," 243rd National Meeting of the American Chemical Society, San Diego, CA, March 25-29, 2012.

Geiger, D. K. "DFT Calculations in the Undergraduate Laboratory: Structure and Bonding in Group 14 Congeners of Ethene," 229th National Meeting of the American Chemical Society, San Diego, CA, March 13-17, 2005.

Geiger, D. K. "DFT Calculations in the Undergraduate Laboratory: Structure and Bonding in Group 14 Congeners of Ethene," 32nd Northeastern Meeting of the American Chemical Society, Rochester, NY, October 31-November 3, 2004.

Streit, B.; Meidenbauer, J.; Geiger, D. K. "Fabrication of Deuterium-Rich Accelerator Targets," Division of Nuclear Physics, American Physical Society, East Lansing, MI, October 9-12, 2002.

Pogozelski, W. K.; Padalino, S. J.; Geiger, D. K.; McLean, J.; Fletcher, K. "Radiation Research with Undergraduates at SUNY Geneseo," American Chemical Society National Meeting, Chicago, IL, August 26-31, 2001.

McGarrah, J. E.; Eisenberg, R.; Connick, W. B.; Geiger, D. "Platinum diimine dithiolate complexes: A study in chromophore-acceptor electron transfer," 216th American Chemical Society National Meeting, Boston, MA, August 23-27, 1998.

Connick, W. B.; Paw, W.; Geiger, D. K.; Eisenberg, R. E. "Platinum(II) Diimine Complexes with Catecholate and Phenylacetylide Ligands," 12th International Symposium on Photochemistry & Photophysics of Coordination Compounds. Colchester, VT, June 28-July 3, 1997.

Seils, J.; Geiger, D. K. "An Examination of Metal Ion Incorporation into Hemiporphyrazine Analogues." 25th Northeastern Regional Meeting of the American Chemical Society. Rochester, NY, October 22-25, 1995.

Vergis, J. M.; LeBlanc, M. P.; Geiger, D. K. "Characterization of a Water-Soluble Iron(III) Hemiporphyrazine Analogue." 25th Northeastern Regional Meeting of the American Chemical Society. Rochester, NY, October 22-25, 1995.

Seils, J.; Geiger, D. K. "Synthesis of an Unsymmetrically Substituted Porphyrin." 9th National Conference on Undergraduate Research (NCUR 95), Union College, Schenectady, NY, April 20-22, 1995.

Hilt, H.; Vilardo, J. S.; Geiger, D. K. "Synthesis and Characterization of a New Water-Soluble Iron(III) Macrocycle." 8th National Conference on Undergraduate Research (NCUR94), Western Michigan University, Kalamazoo, MI, April 14-16, 1994.

Vilardo, J. S.; Hilt, H.; Geiger, D. K. "Synthesis of Soluble Hemiporphyrazine Derivatives." 8th National Conference on Undergraduate Research (NCUR94), Western Michigan University, Kalamazoo, MI, April 14-16, 1994.

Geiger, D. K.; Schmidt, R. G. "Soluble Hemiporphyrazine Analogues." 206th American Chemical Society National Meeting. Chicago, IL, August 22-27, 1993.

Geiger, D. K.; Schmidt, R. G. "Water-Soluble Hemiporphyrazine Analogues." 22nd North­eastern Regional Meeting of the American Chemical Society. Syracuse, NY, June 21-24, 1992.

Geiger, D. K.; Schmidt, R. G. "Synthesis of Hemiporphyrazine Analogues." 21st North­eastern Regional Meeting of the American Chemical Society. Amherst, MA, June 24-26, 1991.

Povlock, S. L.; Geiger, D. K. "Mixed Porphyrin-Phthalocyanine Aggregates." 4th National Conference on Undergraduate Research, Union College, Schenectady, NY, April 19-21, 1990.

Geiger, D. K.; Dennis, L. A.; Boiani, J. A. "Photochemistry of Mixed Aggregates of Porphyrins and Phthalocyanines." 4th International Conference on Bioinorganic Chemistry. Cambridge, MA, July 23-28, 1989.

Geiger, D. K.; Dennis, L. A.; Povlock, S. A.; Boiani, J. A. "Photochemistry of Porphyrin-Phthalocyanine Heterodimers." 19th Northeastern Regional Meeting of the American Chemical Society. Albany, NY, June 18-21, 1989.

Kelly, C. A.; Geiger, D. K. "Induced Aggregation of Water Soluble Metallophthalocyanines and Porphyrins." 17th Regional Meeting of the American Chemical Society. Rochester, NY, November 8-11, 1987.

Kelly, C. A.; Stoner, T. M.; Mead, G.; Smith, R. F.; Geiger, D. K. "A New Model for Proteins Containing Associated Tetrapyrrole Macrocycles." Rochester Academy of Science Fall Meeting. Geneseo, NY, November 7, 1987.

Kutal, C.; Weber, M.; Ferraudi, G.; Geiger, D. "Catalytic Photoreduction of Carbon Dioxide: A Mechanistic Study." 36th Southeastern Regional Meeting of the American Chemical Society. Raleigh, NC, October 24-26, 1984.

Scheidt, W. R.; Geiger, D. K.; Lee, Y. J. "Characterization of Five-Coordinate Imidazole-ligated Iron(III) Porphyrinates." 23rd International Conference on Coordination Chemistry. Boulder, CO. July-August, 1984.

Scheidt, W. R.; Lee, Y. J.; Geiger, D. K. "Control of Spin State in Porphinatoiron(III) Derivatives." 185th American Chemical Society National Meeting, Seattle, WA. March, 1983.

Geiger, D. K.; Scheidt, W. R. "Control of Spin State in Porphyrin Complexes." Presented at "Inorganic Chemistry: Toward the 21st Century," a symposium cosponsored by the Divisions of Inorganic Chemistry of the American Chemical Society, the Chemical Institute of Canada, and the Dalton Division of the Royal Society of Chemistry. Indiana University, Bloomington, IN, May, 1982.