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Title: Mixed-sandwich Cp*Cr complexes containing poly(methimazolyl)borates (Cp* = C5Me5) : syntheses and structural and electrochemical studies
Authors: Kuan, Seah Ling
Leong, Weng Kee
Webster, Richard David
Goh, Lai Yoong
Issue Date: 2011
Source: Kuan, S. L., Leong, W. K., Webster, R. D., & Goh, L. Y. (2011). Mixed-Sandwich Cp*Cr Complexes Containing Poly(methimazolyl)borates (Cp* = C5Me5): Syntheses and Structural and Electrochemical Studies. Organometallics, 31(1), 273–281.
Series/Report no.: Organometallics
Abstract: Reaction of the scorpionate salts K[HB(mt)3], Na[H2B(mt)2], and Li[HB(mt)2(pz)] with [Cp*CrBr2]2 (1) gave the 15-electron Cr(III) complexes [Cp*Cr{κ3-S,S′,S″-HB(mt)3}]Br (2), [Cp*Cr{κ2-S,S′-H2B(mt)2}Br] (3), and [Cp*Cr{κ2-S,S′-HB(mt)2(pz)}Br] (4) in moderate to high yields. These are the first examples of mixed-sandwich chromium(III) complexes containing poly(methimazolylborate) ligands. The tridentate coordination of the monoanionic ligands [H2B(mt)2] in 3 and [HB(mt)2(pz)] in 4 can be effected by using a silver salt to remove the Br coligand, thus yielding the complexes [Cp*Cr{κ3-H,S,S′-H2B(mt)2}]PF6 (6) and [Cp*Cr{κ3-N,S,S′-HB(mt)2(pz)}]PF6 (7). It was also found that, in the presence of acetonitrile, the reaction of 3 with AgPF6 afforded [Cp*Cr{κ2-S,S′-H2B(mt)2}(NCMe)]PF6 (5). The coordination geometries of all the complexes have been determined by X-ray diffraction analyses. Cyclic voltammetric studies of complexes 2, 4, and 7 showed that the oxidation and reduction processes are chemically reversible and that the reduced and oxidized states of complexes 3, 5, and 6 are very short-lived.
DOI: 10.1021/om2008666
Rights: © 2011 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by Organometallics, American Chemical Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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