Transesterification reactions of dimethoxycarbonylethyltin-pyrrolidinodithiocarbamate, [Sn(PDTC)2(CH2CH2COOCH3)2] – Spectroscopic and X-ray structural characterization of new estertin dithiocarbamate complexes – Part I

Abstract The reaction of [Cl 2 Sn(CH 2 CH 2 CO 2 Me) 2 ] with sodium pyrrolidinodithiocarbamate (NaPDTC) in CHCl 3 afforded [Sn(PDTC) 2 (CH 2 CH 2 CO 2 Me) 2 ], (1) . Transesterification reactions of (1) with different alcohols in the presence of dmso yielded [Sn(PDTC) 2 (CH 2 CH 2 CO 2 Et) 2 ], (2) , [Sn(PDTC) 2 (CH 2 CH 2 CO 2 Pr) 2 ], (3) , and [Sn(PDTC) 2 (CH 2 CH 2 CO 2 Bu) 2 ], (4) . All complexes were characterized by elemental analysis, FTIR, and 1 H, 13 C{ 1 H} and 119 Sn{ 1 H} NMR spectroscopy. In addition, the crystal structures of (1) , (2) and (4) , determined by single-crystal X-ray diffraction, confirmed the presence of two different ester groups in each product, namely a free C O group and a C O⋯Sn chelating system. For (1) , (2) and (4) , the Sn-C bonds occupy the apical positions of a distorted pentagonal bipyramid, whereas the five equatorial positions are taken by the S donor centres of the unsymmetrically bonded dithiocarbamate ligands and the C O⋯Sn contact. Complexes (1) and (4) display 1D chain networks, while (2) exhibits a 2D supramolecular structure. The supramolecular networks in all complexes are held by intermolecular C-H⋯O and C-H⋯S contacts.