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

Abstract

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 (¹H, ¹³C and ¹¹⁹Sn) 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 μ₂-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⋯O hydrogen bonding interactions and C–H⋯π interactions. Weak C–H⋯O interactions were also found to be important for the formation of the 3-D structure for 3.

Keywords:

• Organotin complexes
• 2-(trifluoromethyl)benzeneseleninic acid
• tetranuclear 16-membered macrocycle
• polymeric chain
• helical double chain

Disclosure statement

No potential conflict of interest was reported by the authors.

Funding

This work was supported by the National Natural Science Foundation of China [grant number 21371087]; Natural Science Foundation of Shandong Province [grant number ZR2012BM019], [grant number ZR2015BL001].