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- W2037269802 abstract "Es wird uber ESR-Untersuchungen an V(N⌢N)3 und Co(N⌢N)2 (N⌢N: Benzil-bis-N-phenylimin) berichtet. Die ESR-Parameter — g, AV — zeigen fur V(N⌢N)3 eine schwach gestorte trigonale Koordinationsgeometrie (D3) an. Ihre Interpretation im Rahmen der Ligandenfeldtheorie fur eine Niedrigspin-d5-Elektronenkonfiguration ergibt fur den Grundzustand des ungepaarten Elektrons einen 2A1-Bahnsingulett-Zustand und einen grosen Wert fur den trigonalen Ligandenfeldparameter K. Das ESR-Spektrum von Co(N⌢N)2 konnte nur bei 4,2 K erhalten werden. Seine rhombische Symmetrie und das Fehlen von Hyperfeinstrukturwechselwirkungen mit den Kernen 59Co und 14N ist auf der Basis einer rhombisch verzerrten, gestauchten Tetraedersymmetrie (D2) fur Co(N⌢N)2 erklarbar. Ausgehend von den Parametern des Spin-Hamiltonoperators wird der Charakter der Metall-Ligand-Bindung und das Elektronenspektrum diskutiert.Interaction of Hetero-π-Systems with Central Metal Atoms in Low Oxidation States. ESR Investigations on Structure and Bonding in Low Spin d5-(S = 1/2)-Tris(benzil-bis-N-phenylimine)vanadium(0) and Bis(benzil-bis-N-phenylimine)cobalt(0)ESR investigations on V(N⌢N)3 and Co(N⌢N)2(N⌢N: Benzil-bis-N-phenylimine) are reported. The ESR parameters — g, AV — indicate trigonal coordination geometry (D3) for V(N⌢N)3 disturbed by a small lower-symmetric ligand-field component. Interpretation of these parameters in terms of a ligand-field model for a low-spin d5 electronic configuration shows the electronic ground state to be 2A1 and yields a large value for the trigonal field splitting parameter K. The ESR spectrum of Co(N⌢N)2 could be obtained at 4.2 K only. Its rhombic symmetry and the absence of hyperfine interactions with the nuclei 59Co and 14N is consistent with a rhombically distorted, compressed tetrahedral symmetry (D2) for Co(N⌢N)2. The spin-Hamiltonian parameters are discussed in terms of the metal-ligand bond character and the electronic spectrum." @default.
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- W2037269802 title "Wechselwirkungen von Hetero-?-Systemen mit Zentralmetallatomen in niedrigen Oxydationsstufen. ESR-Untersuchungen zur Struktur und Bindung an Niedrig-spin-d5-(S = 1/2)-Tris(benzil-bis-N-phenylimin)vanadium(0) und Bis(benzil-bis-N-phenylimin)cobalt(0)" @default.
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- W2037269802 doi "https://doi.org/10.1002/zaac.19834960116" @default.
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