Nature of Cr—Cr “quadruple bond”. Photoelectron spectra of solid tetra-µ-acetatodichromium(II), solid and gaseous tetra-µ-trifluoroacetate-dichromium(II), and gaseous tetra-µ-{6-methyl-2-hydroxypyridine}-dichromium(II) and -dimolybdenum(II)
- 1 January 1979
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 75, 485-493
- https://doi.org/10.1039/f29797500485
Abstract
Photoelectron spectral data are reported for solid Cr2(O2CMe)4, solid and gaseous Cr2(O2CCF3)4 and gaseous Cr2(MHP)4 and Mo2(MHP)4(H{MHP}= 6-methyl-2-hydroxypyridine). For Cr2(O2CR)4(R = Me or CF3) the metals' valence electron ionizations are all contained within one broad low energy band, whereas for Cr2(MHP)4 and Mo2(MHP)4 the metal–metal bonding orbitals have ionization energies δ < π, σ. There is found to be a close correlation between bond length and quadruple bond character of the Cr—Cr bond. The assignment of the metal ionizations in Cr2(O2CR)4 is facilitated by the comparison between solid and gas phase spectra.Keywords
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