Synthesis and structural studies of dimethyltin(IV) 5-[(E)-2-(aryl)-1-diazenyl)quinolin-8-olates

A series of cis-bis{5-[(E)-2-(aryl)-1-diazenyl]quinolin-8-olato}dimethyltin(IV), Me2Sn(L)(2), and chloro-{5-[(E)-2-(aryl)-1-diazenyl]quinolin-8-olato}dimethyltin(IV), Me2SnCl(L), complexes have been synthesized by reacting the sodium salts of 5-[(E)-2-(aryl)-1-diazenyl)quinolin-8-ol (LH) and dimethyltin dichloride in 2:1 and 1:1 molar ratios, respectively. These complexes have been characterized by H-1, C-13, Sn-119 NMR in solution and by IR and Sn-119 Mossbauer spectroscopy in the solid state. The structures of two of the dimethyltin(IV) complexes, viz., Me2Sn(L-2)(2) (2) and Me2SnCl(L-3).C7H8 (6) (L-2 = 5-[(E)-2-(4-methoxyphenyl)-1-diazenyl)quinolin-8-olate, L-3 = 5-[(E)-2-(4-ethoxyphenyl)-1-diazenyl)quinolin-8-olate), were determined by single crystal X-ray diffraction. In general, the Me2Sn(L)(2) complexes were found to adopt a distorted cis-octahedral arrangement, while Me2SnCl(L) complexes have a distorted trigonal bipyramidal coordination geometry around the tin atom in solution and in the solid state.