Syntheses of 4-benzyl-3,5-dimethylpyrazolylborato complexes of molybdenum and tungsten nitrosyls: Molecular structure of [Mo(CO)2(NO){HB(3,5-Me2-4-PhCH2C 3N2)3}], a complex with an 'inverted' bowl-like structure

John C. Jeffery, Stefan S. Kurek, Jon A. McCleverty*, Elefteria Psillakis, Rob M. Richardson, Michael D. Ward, Andrzej Wlodarczyk

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

22 Citations (Scopus)

Abstract

Reaction of [HB(bdmpz)3]-, obtained by reaction of 4-benzyl-3,5-dimethylpyrazole (Hbdmpz) with KBH4, with [M(CO)6] (M = Mo or W) and p-MeC6H4SO2N(NO)Me afforded [M(CO)2(NO)-{HB(bdmpz)3}] (M = Mo or W). The molybdenum carbonyl was converted into [Mo(NO)-{HB(bdmpz)3}X(Y)] (X = Y = Cl, I or OC6H4Me-p; X = Cl, Y = OMe or OC6H4Me-p) the spectral and electrochemical properties of which are virtually identical to those of [Mo(NO){HB(dmpz)3}X(Y)] (Hdmpz = 3,5-dimethylpyrazole), indicating that the addition of a benzyl group has no significant electronic effect in the new species. However, a crystal and molecular structure determination of [Mo(CO)2(NO){HB(bdmpz)3}] revealed that the molecule has a highly symmetrical structure, the CH2 groups of the benzyl groups in the tris(pyrazolyl)borate ligand being disposed in a star-shaped configuration where the phenyl rings adopt an 'inverted' bowl-like structure with the BH group inside and the Mo(CO)2(NO) group outside the bowl. The arrangement of the 4-benzyl groups with respect to the pyrazolyl rings and the H-B ⋯ Mo three-fold axis is strongly reminiscent of an inverted three-legged 'Isle of Man' symbol.

Original languageEnglish
Pages (from-to)2559-2564
Number of pages6
JournalJournal of the Chemical Society: Dalton Transactions
Issue number17
DOIs
Publication statusPublished - 1 Dec 1994

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