Synthesis and Characterization of Diorganotin Compounds {[R2Sn（ON =CHC6H5）]2O}2 and Crystal Structure of {[（C6H5CH2）2Sn（ON=CHC6H5）]2O}2

Introduction Dimeric tetraorganodistannoxanes are a kind of in-teresting organotin oxo clusters and have attracted con-siderable attention during the last several decades, in view of their unique structural features1-5 as well as their applications as biocides6,7 and in homogenous cataly-sis.8,9 In the solid state, they contain characteristic Sn4O2X2Y2 structural motifts with staircase or ladder arrangements, a planar four-membered Sn2O2 ring and, generally, penta-coordination around the tin…

Synthesis and Characterization of Diorganotin Compounds {[R_2Sn(ON=CHC_6H_5)]_2O}_2 and Crystal Structure of {[(C_6H_5CH_2)_2Sn(ON=CHC_6H_5)]_2O}_2

Diorganotin compounds (R₂Sn(ON=CHC₆H₅)]₂O)₂ R=C₆H₅CH₂ (1), 2‐FC₆H₄CH₂ (2), 4‐FC₆H₄CH₂ (3), 2‐ClC₆H₄CH₂ (4), 4‐ClC₆H₄CH₂ (5)] were synthesized by the reaction of R₂SnO with HON=CHC₆H₅ in 1:1 molar ratio in refluxing anhydrous benzene or toluene. They were characterized by elemental analysis, IR, ¹H NMR and ¹¹⁹Sn NMR spectroscopy. And two sets of ¹¹⁹Sn chemical shifts were observed in the ¹¹⁹Sn NMR spectra of these compounds, indicating the presence of two types of environment around the tin atoms. The crystal structure of compound 1 was determined by X‐ray single crystal diffraction analysis. The results showed that the crystal of compound 1 belongs to a monoclinic system with space group P2₁/c and unit cell dimensions: α=1.0718(9) nm, b=1.9666(17) nm, c=2.0480(17) nm, β=96.4371(14)°, D_c=1.450 g/cm³, Z=2, F(000)=1888, V=4.290(6) nm³, μ=1.206 mm^?1, R₁=0.0405, wR₂=0.0786. The compound 1 belongs to centrosymmetric dimer structure mode with a four‐membered central endo‐cyclic Sn₂O₂ unit in which the bridging oxygen atoms are hi‐coordinated. Each bridging oxygen atom also connects with an em‐cyclic tin atom. The endo‐ and exo‐cyclic tin atoms are both five‐coordinated, and have coordination geometry of distorted trigonal bipyramid.