Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

Study of Laser Desorption-Ionization of [Co(H2O)6](NO3)2, [Co(H2O)7]SO4, [Co(NH3)5Cl]Cl2, [Co(NH3)4CO3]NO3, [Fe(H2O)6]SO4 and [Fe(H2O)7](NO3)3 Complexes by Time of Flight Mass Spectrometry

Document Type : Research Article

Authors
Seyed Hamid Khansari Zadeh
Hossein Farrokhpour
Mahmoud Tabrizchi
Ali Hossein Kianfar
Chemistry Department, Isfahan University of Technology, Isfahan, I.R. IRAN
Abstract
The time of flight mass spectrometry is an efficient technique for the identification and characterization of chemical materials. In this method, the ions produced by the interaction of laser radiation with the sample, are accelerated in the ionization region and after obtaining enough kinetic energy are separated from each other in the absence of an electrical field based on their mass to charge ratio in a flight tube and then, reach to the detector at different times. In this work, the time of flight mass spectra of several inorganic complexes such as [Co(H2O)6](NO3)2, [Co(H2O)7]SO4, [Co(NH3)5Cl]Cl2, [Co(NH3)4CO3]NO3, [Fe(H2O)6]SO4 and [Fe(H2O)7](NO3)3 were recorded using the desorption-ionization (LDI) of sample on the aluminum plate. The laser light with a wavelength of 1064 nm (infrared region) was used for the LDI. Comparison of the recorded mass spectra of Co complexes with H2O ligands with those of Co complexes with NH3 ligands showed that the metal-oxygen bond is stronger than the metal-nitrogen bond because the different ionic species containing the metal-oxygen bonds are seen in the mass spectra of complexes containing H2O as a ligand. The absence of the peak related to the intact complex in the recorded mass spectra showed that these complexes have not stability against the laser radiation. Also, the effect of different counterions on the mass spectra of complexes with the same metal and ligands was investigated and it was found that the mass spectra are independent of the kind of counterion.
Keywords
Time of flight mass spectrometry
Laser desorption-ionization (LDI)
Inorganic complexes
Laser

Subjects

[1] Tabrizchi M., Farrokhpour H., Abyar F., Azad H., Mirian M., and ILbeigi V., Design, Construction and Calibration of a Laser Ionization Time-of-Flight Mass Spectrometer, Physical Chemistry Research, 2: 202-216, (2014).
 [2]  Märk T. D., Dunn G. H., "Electron Impact Ionization": Springer Science & Business Media, (2013).
[3] Fenn J. B., Mann M., Meng C. K., Wong S. F., Whitehouse C. M., Electrospray Ionization–Principles and Practice, Mass Spectrometry Reviews, 9: 37-70, (1990).
[4] Cha S., "Laser Desorption/Ionization Mass Spectrometry for Direct Profiling and Imaging of Small Molecules from Raw Biological Materials",  Iowa State University, (2008).
[5] Dreisewerd K., Berkenkamp S., Leisner A., Rohlfing A., Menzel C., Fundamentals of Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry with Pulsed Infrared Lasers, International Journal of Mass Spectrometry, 226: 189-209, (2003).
[6] Van Bramer S. E., "An Introduction to mass Spectrometry," Widener University, Department of Chemistry, One University Place, Chester,PA, 19013, (1997).
[7] Bhaskar G., Prabhakar S., Raju N. P., Ramanjaneyulu G., Matrix-Assisted Laser Desorption/Ionization Studies on Transition Metal Complexes of Benzimidazole Thiosemicarbazones, European Journal of Mass Spectrometry, 13: 135-145, (2007).
[8] Vujačić A., Bugarčić Ž. D., Schiller J., Vasić V., Petković M., Matrix-Assisted Laser Desorption and Ionisation Time-of-Flight Mass Spectrometry of Pt (II) and Pd (II) Complexes, Polyhedron, 28: 2905-2912, (2009).
[9] Petković M., Petrović B., Savić J., Bugarčić Ž. D., Dimitrić-Marković J., Momić T., et al., Flavonoids as Matrices for MALDI-TOF Mass Spectrometric Analysis of Transition Metal Complexes, International Journal of Mass Spectrometry, 290: 39-46, (2010).
[10] Hsu N.-Y., Tseng S. Y., Wu C.-Y., Ren C.-T., Lee Y.-C., Wong C.-H., et al., Desorption Ionization of Biomolecules on Metals, Analytical Chemistry, 80: 5203-5210, (2008).
[11] Dopke N. C., Treichel P. M., Vestling M. M., Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS) of Rhenium (III) Halides: A Characterization Tool for Metal Atom Clusters, Inorganic Chemistry, 37: 1272-1277, (1998).
[12] م. تبریزچی, "ساخت طیف سنج جرمی زمان پرواز با منبع یونش لیزری," 73361, (1391).