Please use this identifier to cite or link to this item: https://doi.org/10.1021/om2008666
Title: Mixed-sandwich Cp*Cr complexes containing poly(methimazolyl)borates (Cp* = C 5Me 5): Syntheses and structural and electrochemical studies
Authors: Kuan, S.L. 
Leong, W.K.
Webster, R.D.
Goh, L.Y.
Issue Date: 9-Jan-2012
Citation: Kuan, S.L., Leong, W.K., Webster, R.D., Goh, L.Y. (2012-01-09). Mixed-sandwich Cp*Cr complexes containing poly(methimazolyl)borates (Cp* = C 5Me 5): Syntheses and structural and electrochemical studies. Organometallics 31 (1) : 273-281. ScholarBank@NUS Repository. https://doi.org/10.1021/om2008666
Abstract: Reaction of the scorpionate salts K[HB(mt) 3], Na[H 2B(mt) 2], and Li[HB(mt) 2(pz)] with [Cp*CrBr 2] 2 (1) gave the 15-electron Cr(III) complexes [Cp*Cr{κ 3-S,S′,S″-HB(mt) 3}]Br (2), [Cp*Cr{κ 2-S,S′-H 2B(mt) 2}Br] (3), and [Cp*Cr{κ 2-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 [H 2B(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{κ 3-H,S,S′-H 2B(mt) 2}]PF 6 (6) and [Cp*Cr{κ 3-N,S,S′-HB(mt) 2(pz)}]PF 6 (7). It was also found that, in the presence of acetonitrile, the reaction of 3 with AgPF 6 afforded [Cp*Cr{κ 2-S,S′-H 2B(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. © 2011 American Chemical Society.
Source Title: Organometallics
URI: http://scholarbank.nus.edu.sg/handle/10635/94286
ISSN: 02767333
DOI: 10.1021/om2008666
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