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Murat Citir



Postdoctoral Research Fellow
   



Postdoctoral Research Fellow
Department of Chemistry
University of Utah
mcitir@chem.utah.edu
   
MSPIRE Research Interests

Citir’s MSPIRE research has used the free electron laser for infrared experiments (FELIX) facility at FOM ”Rijnhuizen” to measure infrared multiple photon dissociation (IRMPD) action spectra of two series of systems. First, he has studied metallated cysteine, an amino acid containing a sulfur side chain. Murat studied M+(Cys) complexes where M+ = Na+, K+, and Rb+ and has combined these results with previous work where M+ = Li+, Cs+, and Ba2+. Second, he has examined M+(His) complexes where M+ = H+, Li+, Na+, and Rb+ and will combine these data with previous work where M+ = K+ and Cs+. Comparison of these results to predictions from accurate quantum chemical calculations will allow identification of the conformations involved. For both amino acids, results suggest that the heavier metals exhibit multiple conformers, whereas the lighter metals have only a tridentate configuration.

Murat obtained his Ph.D. degree from the University of Massachusetts Amherst working with Prof. Ricardo Metz. His graduate studies involved the examination of photodisso-ciation spectroscopy of covalently bound transition metal cation complexes. At the University of Utah, Citir has been working primarily on transition metal clusters and their oxides. The objectives of this project are to obtain quantitative information regarding the thermodynamic properties of transition metal clusters, their binding energies to various ligands, and their reactivities. He has published work on the reactions of cobalt cluster cations with methane and is pursuing studies on the stabilities and reactivities of iron oxide cluster cations. These studies utilize a guided ion beam tandem mass spectrometer with a laser vaporization/supersonic expansion cluster source.

Dr. Citir has taken a faculty position at Abdullah Gül University, Melikgazi / Kayseri, Turkey, effective the spring of 2012.

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Figure. The spectrum of Li+(Cys) complex can be completely reproduced by the spectrum calculated for the tridentate structure shown in the upper right. As the metal ion gets heavier, new bands in the spectra grow in, indicating the presence of other structures, primarily that shown in the upper left, where the metal cation binds to both oxygens of the carboxylic acid group.


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MSPIRE Publications

1. Infrared Multiple Photon Dissociation Spectroscopy of Cationized Cysteine: Effects of Metal Cation Size on Gas-Phase Conformation, M. Citir, E.M.S. Stennett, J. Oomens, J.D. Steill, M.T. Rodgers, and P.B. Armentrout, Int. J. Mass Spectrom. (Special Issue: Ion Spectroscopy) 2010, 297, 9-17.
DOI:10.1016/j.ijms.2010.04.009

2. Infrared Multiple Photon Dissociation Spectroscopy of Cationized Histidine: Effects of Alkali-Metal Cation Size on Gas-Phase Conformation, M. Citir, C. S. Hinton, J. Oomens, J. D. Steill, and P. B. Armentrout, J. Phys. Chem. A 2012, 116, 1532-1541
DOI:10.1021/jp209636a

3. Infrared Multiple Photon Dissociation Spectroscopy of Protonated Histidine and 4-Phenyl Imidazole, M. Citir,C. S. Hinton, J. Oomens, J. D. Steill, P. B. Armentrout, Int. J. Mass Spectrom. 2012, 330-332, 6-15. DOI:10.1016/j.ijms.2012.06.002
































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