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- W1796685376 abstract "Differential pulse and current voltammetry for the cubane-like clusters [(η-C5R5)Cr(μ3-O)]4 (R = H, Me; R5 = H4Me) showed that [(η-C5H4Me)Cr(μ3-O)]4 and [(η-C5Me5)Cr(μ3-O)]4 were oxidized to {[(η-C5R5)Cr(μ3-O)]4}+ and then to {[(η-C5R5)Cr(μ3-O)]4}2+, but [(η-C5H5)Cr(μ3-O)]4 was oxidized only to {[(η-C5H5)Cr(μ3-O)]4}+. Oxidation of [(η-C5Me5)Cr(μ3-O)]4 (1) by AgBF4 or tcnq gave {[(η-C5Me5)Cr(μ3-O)]4}{BF4} (2) or {[(η-C5Me5)Cr(μ3-O)]4}{tcnq} (3). It was shown by X-ray diffraction that the average Cr−Cr, Cr−O, and Cr−Cp* distances in 2 and 3 were 0.034(2), 0.007(5), and 0.02(1) Å shorter than those in 1, respectively. Compounds 1, 2, and 3 were antiferromagnetic, with similar intracluster exchange coupling constants, J (−262(23), −211(34), and −266(46) cm-1, respectively). There was coupling between unpaired electrons on {[(η-C5Me5)Cr(μ3-O)]4}+ and {tcnq}- in 3 at temperatures below 110 K." @default.
- W1796685376 created "2016-06-24" @default.
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- W1796685376 date "2001-03-31" @default.
- W1796685376 modified "2023-09-23" @default.
- W1796685376 title "Organometallic Oxides: Oxidation of the Cubane [(η-C<sub>5</sub>R<sub>5</sub>)Cr(μ<sub>3</sub>-O)]<sub>4</sub> and the Structures and Magnetic Properties of the Salts {[(η-C<sub>5</sub>R<sub>5</sub>)Cr(μ<sub>3</sub>-O)]<sub>4</sub>}{tcnq} and {[(η-C<sub>5</sub>R<sub>5</sub>)Cr(μ<sub>3</sub>-O)]<sub>4</sub>}{BF<sub>4</sub>}" @default.
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- W1796685376 doi "https://doi.org/10.1021/om001067y" @default.
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