PULSED-FIELD IONIZATION ELECTRON SPECTROSCOPY OF COPPER-PYRAZINE, -PYRIMIDINE, AND -PYRIDAZINE COMPLEXES
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Date
2006
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Ohio State University
Abstract
The copper complexes of pyrazine (1,4-C$_4$H$_4$N$_2$), pyrimidine (1,3-C$_4$H$_4$N$_2$), and pyridazine (1,2-C$_4$H$_4$N$_2$) are produced in laser-vaporization supersonic molecular beams and studied with pulsed field ionization zero electron kinetic energy spectroscopy and {\em ab initio} calculations. Adiabatic ionization energies of Cu-pyrazine, -pyrimidine and -pyridazine are measured to be 46038(7), 45332(7) and 43054(6) cm$^{-1}$, respectively. The metal-ligand stretching frequencies of Cu$^{+}$/Cu-pyrazine, -pyrimidine, and -pyrazine are 265/190, 270/189, and 273/192 cm$^{-1}$, and the metal-ligand bending frequencies of these complexes are 115/74, 161/151, and 131/123 cm$^{-1}$, respectively. In addition, a symmetric ring stretch of 906 cm$^{-1}$ is observed for the Cu$^{+}$-pyrazine ion. In all three complexes, Cu binds with one nitrogen atom and is located in the same plane as the ligand ring.
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Author Institution: Department of Chemistry, University of Kentucky, Lexington, KY 40605-0055