The synthesis, structure and properties of the hitherto unreported triply bonded dirhenium(II,II) dithiocarbamato complexes have been reported.

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The four-membered ruthenium(II) organometallics Ru(η 2 -RL)(PPh 3 ) 2 (CO)(Cl) (1) where η 2 -RL = C 6 H 2 O-2-CHNHC 6 H 4 R(p)-3-Me-5 and R = CH 3 reacts with 2-(2-hydroxyphenyl)benzothiazole (Hhpbt) and 2-(2hydroxyphenyl)benzoxazole (Hhpbo) in re uxing ethanol to afford Ru(PPh 3 ) 2 (CO)(hpbt)Cl (2) and Ru(PPh 3 ) 2 (CO)(hpbo)Cl (3) respectively in excellent yield. In the course of these reactions the Ru-C(aryl) bond in 1 is cleaved and the RL ligand is no longer coordinated with the metal center in the products. The spectral (UV-vis, IR, 1 H NMR) and electrochemical data of the complexes are reported. The identity of complex 2 has been established by single-crystal X-ray structure determination. The electronic structure and the absorption spectra of the complexes are scrutinized by DFT and TD-DFT analyses.

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