Photochemical reactions of metal carbonyls [M(CO)6 (M = Cr, Mo, W), Re(CO)5Br, Mn(CO)3Cp] with 3,5-dimethyl-tetrahydro-2H-1,3,5-thiadiazine-2-thione (DTTT) and the crystal structure of [W(CO)5(DTTT)]

Five new complexes, [M(CO)5(DTTT)] [M = Cr; 1, Mo; 2, W; 3], [Re(CO)4Br(DTTT)] (4) and [Mn(CO)2Cp(DTTT) (5) have been synthesized by the photochemical reaction of metal carbonyls [M(CO)6] (M = Cr, Mo and W), [Re(CO)5Br], and [Mn(CO)3Cp] with 3,5-dimethyl-tetrahydro-2H-1,3,5-thiadiazine-2-thione (DTTT). The complexes have been characterized by elemental analysis, mass spectrometry, FTIR, 1H and 13C{1H} NMR spectroscopy. The spectroscopic studies show that DTTT behaves as a monodentate ligand coordinating via the sulfur (C=S) donor atom in 1-5. An X-ray diffraction study of [W(CO)5(DTTT)] (3) confirms that the tungsten adopts a distorted octahedral geometry with local C4v symmetry. © 2003 Elsevier Science Ltd. All rights reserved.We thank BP (Turkey) for the provision of photochemical apparatus and Research Foundation of Ege University and Istanbul University for funds. We thank TUBITAK for allocation of time at the NMR, Mass Spectra and Elemental Analyses. We thank Dr. Arthur J. Carty for allowing use of the x-ray facilities at the National Research Council of Canada. -