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Dihydrobis(methimazolyl)borato complexes of ruthenium and osmium

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Abstract

The reaction of Na[H2B(mt)2] (mt = 2-mercapto, 3-methylimidazol-1-yl, methimazolyl) with [Ru(X)Cl(CO)(PPh3)n] (n = 3 X = H; n = 2 BO2C6H4, SiCl3, SiMe3) affords the complexes [Ru(X)(CO)(PPh3){κ2-H,S,S′-H2B(mt)2}]. Evidence is presented to also support the transient formation of [Ru(X)(CO)(PPh3){κ2-H,S,S′-H2B(mt)2}] (X = CH[double bond, length as m-dash]CHPh, Ph) via a similar strategy, although these are unstable. The osmium complex [OsH(CO)(PPh3){κ2-H,S,S′-H2B(mt)2}] is similarly obtained from [OsHCl(CO)(PPh3)3] or [OsH(NCMe)2(CO)(PPh3)2]BF4. The reaction of [RuH(CO)(PPh3){κ2-H,S,S′-H2B(mt)2}] with chloroform or diphenyldiselenide provides [Ru(X)(CO)(PPh3){κ2-H,S,S′-H2B(mt)2}] (X = Cl, SePh), the latter reaction also providing traces of [Ru(SeH)(CO)(PPh3){κ2-H,S,S′-H2B(mt)2}]. Spectroscopic and structural data for the series [Ru(X)(CO)(PPh3){κ2-H,S,S′-H2B(mt)2}] are discussed in terms of perturbations on the B–H–Ru interaction by the trans-ligand X.

Graphical abstract: Dihydrobis(methimazolyl)borato complexes of ruthenium and osmium

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Publication details

The article was received on 05 Jul 2017, accepted on 27 Sep 2017 and first published on 04 Oct 2017


Article type: Paper
DOI: 10.1039/C7DT02420G
Citation: Dalton Trans., 2017, Advance Article
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    Dihydrobis(methimazolyl)borato complexes of ruthenium and osmium

    M. R. St.-J. Foreman, C. Ma, A. F. Hill, N. E. Otten, M. Sharma, N. Tshabang and J. S. Ward, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT02420G

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