One-pot synthesis of sulphur bridged dinuclear rhenium metallacycles via addition of S–S bond across Re–Re bond

Oxidative addition of diaryl disulphides RSSR to low-valent transition metal carbonyl Re2(CO)10 with monodendate pyridine ligands bring forth novel sulphur bridged neutral dinuclear rhenium metallacycles [L(CO)3Re(μ-SR)2Re(CO)3L] (1–9) (L = pyridine ligand, R = aryl group) under one pot reaction conditions. The Metallacycles 1–9 have been characterised by elemental analysis, NMR and IR and absorption spectral analysis. Molecular structures of 4, 8 and 9 were determined by crystallographic analysis and the structural studies reveal that pyridyl groups attached to metal centres exhibit cis conformation.

Oxidative addition of S–S bond and addition across the Re–Re bond in presence of monotopic N-donor ligands afforded the sulphur bridged dinuclear neutral metallacycles cis-[L(CO)3Re(μ–SR)2Re(CO)3L] (L = azine ligand, R = aryl group). In these metallacycles, the pyridyl groups bonded to metal centers adopt cis orientation due to π–π and CH-π soft interactionsFigure optionsDownload as PowerPoint slide