Syntheses and structural characterization of organotin complexes derived from 2-(trifluoromethyl)benzeneseleninic acid: tetranuclear macrocycle, 1-D polymeric chain, helical double-chain

Four organotin(IV) complexes based on 2-(trifluoromethyl) benzeneseleninic acid, [Me3Sn(O2SeC6H4-2-CF3)](4) (1), [Ph3Sn(O2SeC6H4-2-CF3)](n) (2), [R2Sn(O2SeC6H4-2-CF3)(2)](n) (R = Me 3; n-Bu 4), have been synthesized and characterized by X-ray diffraction, elemental analysis, infrared spectroscopy, and NMR (H-1, C-13 and Sn-119) spectroscopy. Single-crystal X-ray analyses show that 1 has a centrosymmetric tetranuclear triorganotin selenite with a tetranuclear 16-membered macrocycle formed by trimethyltin and ligand alternately linking; 2 exhibits a 1-D neutral infinite chain structure in which the [O2SeC6H4-2-CF3](-) is a mu(2)-bridging ligand; 3 and 4 are polymeric chain structures containing Sn2O4Se2 eight-membered rings where the areneseleninate groups are double bridges between the tin ions. Examination of the intermolecular contacts of 1 reveals the existence of the C-H center dot center dot center dot O hydrogen bonding interactions and C-H center dot center dot center dot pi interactions. Weak C-H center dot center dot center dot O interactions were also found to be important for the formation of the 3-D structure for 3. [GRAPHICS] .