Abstract
Three new organotin(IV) carboxylates of composition [(R)~2~Sn(O~2~CC~6~H~4~CβOC~6~H~4~CH~3~)~2~] 1, [(R)~2~Sn(O~2~CC~6~H~4~COC~6~H~4~βC~2~H~5~)~2~]~2~ 2, and R~3~SnO~2~ CC~6~H~4~COC~6~H~4~CH~3~ 3, were obtained by reactions of (R)~2~SnO [R = oβtolyl] with 2β(4βmethyl benzoyl) benzoic acid and 2β(4βethyl benzoyl) benzoic acid, and reaction of Cy~3~SnOH [Cy = cyclohexyl] with 2β(4βmethyl benzoyl) benzoic acid, respectively. The complexes 1, 2 and 3 have been characterized by elemental analysis, infrared (IR), ^1^HNMR, and Xβray crystallography diffraction analyses. The complex 1 has two folded symmetrical structure; the tin atom in 1 is found to adopt a distorted toward skewβtrapezoidal bipyramidal geometry. Molecular structure of the complex 2 is centrosymmetric, and the internal tin atom is fiveβcoordinated and is in distorted trigonal bipyramidal geometry. The crystal structure of the complex 3 is found to exhibit distorted tetrahedral geometry. Pilot studies have indicated that the complexes 1 and 2 have shown good antitumor activities. Β© 2010 Wiley Periodicals, Inc. Heteroatom Chem 21:304β313, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20614