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Title: Mixed-Sandwich (Cp*/(HMB))Ru complexes containing Bis(methimazolyl)(pyrazolyl)borate (Cp* = η5-C5Me5 , HMB = η6-C6Me6)
Authors: Kuan, Seah Ling
Leong, Weng Kee
Webster, Richard David
Goh, Lai Yoong
Keywords: DRNTU::Science::Chemistry
Issue Date: 2012
Source: Kuan, S. L., Leong, W. K., Webster, R. D., & Goh, L. Y. (2012). Mixed-Sandwich (Cp*/(HMB))Ru complexes containing Bis(methimazolyl)(pyrazolyl)borate (Cp* = η5-C5Me5 , HMB = η6-C6Me6). Organometallics, 31(14), 5159-5168.
Series/Report no.: Organometallics
Abstract: Reaction of the scorpionate salt Li[HB(mt)2(pz)] (mt = N-methyl-2-mercaptoimidazol-1-yl, pz = pyrazolyl) with the organometallic complexes [Cp*RuOMe]2 (Cp* = η5-C5Me5) (1) and [(HMB)RuCl2]2 (HMB = η6-C6Me6) (2) gave the 18-electron Ru(II) complexes [Cp*Ru(κ3-H,S,S′)-{HB(mt)2(pz)}] (3) and [(HMB)Ru(κ3-H,S,S′)-{HB(mt)2(pz)}](4B)PF6 in moderate yields. In the absence of the PF6– anion, [(HMB)Ru(κ2-S,S′-{HB(mt)2(pz)})(Cl)] [4C] was isolated as a coproduct with (4B)Cl. These complexes are the first examples of organoruthenium(II) complexes containing bis(methimazolyl)(pyrazolyl)borate ligands. Isomers of 4B were observed in solution, and the isomerization process was studied using variable-temperature 1H NMR spectroscopy. The reactivity of 3 toward O2 and CO was investigated, and in the process we isolated the first Ru(IV) peroxo complex containing a poly(methimazolyl)borate ligand, [Cp*Ru(κ2-S,S′-{HB(mt)2(pz)})(η2-O2)] (5), and a CO adduct, [Cp*Ru(κ2-S,S′-{HB(mt)2(pz)})(CO)] (6), respectively. The oxidation process was reversible, but treatment of 5 with CO converted it irreversibly to 6. All the new compounds were fully characterized, including by X-ray diffraction analyses. Cyclic voltammetric studies were also conducted for complexes 3, 5, and 6.
DOI: 10.1021/om300497p
Rights: © 2012 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
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