Cyclopentadienyl nitrosyl compounds of chromium: Aqueous solution chemistry, π bonding and nitric oxide loss

Peter Legzdins, Steven J. Rettig, Kevin M. Smith, Vicki Tong, Victor G. Young

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The complex [Cr(η-C5H5)(NO)2(CF3SO 3)] 1 was synthesised in order to explore the relationship between π-donor ligands and nitrosyl lability and to investigate the aqueous chemistry of the [Cr(η-C5H5)(NO)2]+ fragment. Treatment of 1 with σ-donor ligands gave [Cr(η-C5H5)(NO)2(L)][CF3SO 3] salts. Potentiometric titrations and 1H NMR spectroscopic studies of 1 provided evidence for the existence of [Cr(η-C5H5)(NO)2(H2O)] + and [Cr(η-C5H5)(NO)2(OH)] in aqueous solution. When generated in situ, [Cr(η-C5H5)(NO)2(OH)] reacted with acetylacetone, pyridinecarboxylic acid, or salicylaldehyde to form paramagnetic, mononitrosyl complexes, which were independently synthesised from the mononitrosyl precursor [Cr(η-C5H5)(NO)(μ-I)]2. The solid-state molecular structures of [Cr(η-C5Me5)(NO)2(CF3SO 3)] 2, [Cr(η-C5H5)(NO)2(N2C 5H7)] 9 and [Cr(η-C5H5)(NO)(O2C5H 7)] 10 were determined by X-ray crystallography. Crystals of 2 are monoclinic, a = 8.575(1), b = 8.642(1), c = 21.8626(9) Å, β = 91.760(7)°, Z = 4, space group P21/n; crystals of 9 are monoclinic, a = 18.3382(4), b = 11.1774(3), c = 12.9102(1) Å, β = 121.386(1)°, Z = 8, space group C2/c; and those of 10 are orthorhombic, a = 17.373(2), b = 8.833(1), c = 6.926(2) Å, Z = 4, space group Pnma.

Original languageEnglish (US)
Pages (from-to)3269-3276
Number of pages8
JournalJournal of the Chemical Society - Dalton Transactions
Issue number18
DOIs
StatePublished - Sep 21 1997

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