ZEKE SPECTROSCOPY OF METAL COMPLEXES WITH A MULTIDENTATE LIGAND: $M(H_{2}NCH_{2}CH_{2}NH_{2})$ (M = Al, Ga, In)
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Date
2003
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Publisher
Ohio State University
Abstract
Metal coordination to an ethylenediamine ligand may form a chain-like or a cyclic structure. The complex is expected to be a chain if the metal atom is bound to a single nitrogen atom or a five-member ring if the metal is attached to both nitrogen atoms. ZEKE (zero-electron-kinetic-energy) spectra show that $M(H_{2}NCH_{2}CH_{2}NH_{2})$ and $M^{+}(H_{2}NCH_{2}CH_{2}NH_{2})$ (M = Al, Ga, In) complexes have a cyclic conformation. These cyclic complexes have significantly lower adiabatic ionization potentials (AIPs) and metal-nitrogen stretching frequencies than simple metal-primary amines. For example, the AIP of $Ga(H_{2}NCH_{2}CH_{2}NH_{2})$ was determined to be $33322 cm^{-1}, 6008 cm^{-1}$ less than that of $Ga(H_{2}NCH_{3})$. The $Ga^{+}-N$ stretching frequency was measured to be $204 cm^{-1}$ in gallium-ethylenediamine and $299 cm^{-1}$ in gallium-methylamine.$^{a}$
Description
$^{a}$S. Li, G. K. Rothschopf, D. Pillai, B. R. Sohnlein, B. M. Wilson, D. -S. Yang, J. Chem. Phys. 115, 7968 (2001)
Author Institution: Department of Chemistry, University of Kentucky
Author Institution: Department of Chemistry, University of Kentucky