ESR SPECTRA OF $Ag_{3} (^{2}A_{1})$ IN AN $N_{2}$ MATRIX
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Date
1985
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Ohio State University
Abstract
ESR spectra assigned to $AG_{3}$ molecules have been produced by codepositing atomic silver with excess nitrogen at temperatures close to 4.2 K. The spectra are characterized by an axially symmetric spin Hamiltonian having $g_{//} = 1.9933(3)$ and $g_\bot = 1.9558(3)$ and, for $^{107} Ag_{3}, A_{//} = 310.8(6)$ G with $A_\bot (1) = 310.1(6)$ G and $A_{//}(2) = 76.0(2) G$ with $A_\bot(2) = 72.6(2)G$ for the apical(1) and basal(2) nuclei, respectively. The axial symmetry of the spectra is believed to imply that the trimer is rotating about one axis. There is no evidence for a pseudorotating trimer spectrum. The isotropic spin populations are $\rho_{5s}(1) = 0.51$ and $\rho_{5s}(2) = 0.12$ implying an acute angled geometry with ground state symmetry $^{2}A_{1}$. This is in sharp contrast to the obtuse angled isomer ($^{2}B_{2}$ ground state) found for $Ag_{3}$ in a $C_{6}D_{6}$ matrix. For $Ag_{3}(^{2}A_{1})$ there is little p-character on the apical atom but a 10-15% p-hybridization on each of the two basal nuclei.
Description
Author Institution: Department of Chemistry, City University of New York; Department of Chemistry, City University of New York; Department of Chemistry, City University of New York