Issue 33, 2006

Syntheses and reactivity studies of solvated dirhenium acetonitrile complexes

Abstract

Fully and partially solvated triply-bonded [Re2]4+ complexes have been synthesized and their X-ray structures are described. A fully solvated dirhenium salt with BArf [tetrakis(3,5-bis(trifluoromethyl)phenyl)borate] as the counter anion [Re2(CH3CN)10][BArf]4 (1) has been characterized. The solubility of the complex in CH2Cl2 and THF in addition to CH3CN offers the possibility of improved reactivity. The structure of [Re2(µ-O)(CH3CN)10][BF4]4 (2) that possesses a linear [ReIII–O–ReIII]4+ unit is reported. Protonation reactions of cis-Re2Cl2(dppm)2(O2CCH3)2 and trans-Re2Cl4(dppm)2 with HBF4·Et2O in acetonitrile afforded cis and trans [Re2(dppm)2(CH3CN)6][BF4]4 (3 and 4), respectively. Prolonging the reaction time, however, does not lead to fully solvated complex [Re2(CH3CN)10][BF4]4. The neutral nitrogen donor ligands pynp (2-(2-pyridyl)-1,8-naphthyridine) and tznp (2-(2-thiazolyl)-1,8-naphthyridine) react readily with [Re2(CH3CN)10][BF4]4 to provide trans-[Re2(pynp)2(CH3CN)4][BF4]4 and trans-[Re2(tznp)2(CH3CN)4][BF4]4. The X-ray structures trans-[Re2(pynp)2(CH3CN)4][BF4]4 (5) and trans-[Re2(tznp)2(CH3CN)4][BF4]3[PF6] (6) have been determined.

Graphical abstract: Syntheses and reactivity studies of solvated dirhenium acetonitrile complexes

Supplementary files

Article information

Article type
Paper
Submitted
31 Jan 2006
Accepted
19 May 2006
First published
01 Jun 2006

Dalton Trans., 2006, 4011-4019

Syntheses and reactivity studies of solvated dirhenium acetonitrile complexes

J. K. Bera, E. J. Schelter, S. K. Patra, J. Bacsa and K. R. Dunbar, Dalton Trans., 2006, 4011 DOI: 10.1039/B601463A

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