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- W2134945961 abstract "Isotropic and frozen-solution ESR spectra in CH2Cl2–ClCH2CH2Cl have been recorded for the five-co-ordinate, formally cobalt(IV) complexes [Co(S2C2R2)2L][R = CN, L = PEt3; R = CF3or Ph, L = PPh3or P(OPh)3; R = C6H4Me-4, L = PPh3or PEt3; R = C6H4OMe-4, L = PPh3]. The spectra can be described by approximately axial g and 59Co hyperfine matrices with g∥=gx≈ 1.99, g⊥≈ 2.03 and A∥=Ay≈ 61 × 10–4cm –1, A⊥≈ 7 × 10–4cm–1 These parameters are interpreted to show that the cobalt electronic structure is best regarded as low-spin d5, formally CoIV, but the singly occupied molecular orbital is extensively delocalized with only about 25% cobalt 3dxzcharacter. The g and A principal axes are displaced in the xy plane by the angle α which varies from 2 to 31°, increasing with the steric bulk of R and L. This angle is related to the degree of dxz/dyz, hybridization resulting from molecular distortion from C2v, symmetry. The structures of [Co{S2C2(CF3)2}2L][L = P(OPh)3 or PPh3] were determined by X-ray diffraction methods Both complexes are approximately square pyramidal, but for L = P(OPh)3(diamagnetic in the solid state) the molecules are packed in the crystal as face-to-face pairs (Co ⋯ Co 4.11 Å). Extended-Hückel molecular-orbital calculations performed for [Co{S2C2-(CF3)2}2{P(OH)3}] support the interpretation of the ESR results." @default.
- W2134945961 created "2016-06-24" @default.
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- W2134945961 date "1994-01-01" @default.
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- W2134945961 title "Dithiolenes revisited: an electron spin resonance study of some five-co-ordinate cobalt complexes and the crystal structures of [Co{S2C2(CF3)2}2{P(OPh)3] and [Co{S2C2(CF3)}2(PPh3)]" @default.
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- W2134945961 doi "https://doi.org/10.1039/dt9940002903" @default.
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