Crystal structure of (p-(2-hydroxy-5-methyIphenylazo)benzoato]triethyltin, C20H26N2O3Sn

Source of material: Prepared by stirring Et3SnBr with Na[p-(2-hydroxy-5-methylphenylazo)]benzoate in methanol solution for 2 h.Recrystallisation from a mixture of CHCI3 and petroleum ether (303-313 K) (4/1) gave orange blocks in 71 % yield; mp 379 K-380 K.The structure is polymeric owing to the presence of bidentate bridging carboxylate ligands which form disparate Sn-0(1) and Sn-0(2)' distances of 2.149(4) Â and 2.586(4) Â, respectively (symmetry operation: x, 0.5 -y, -1.5+z).The Sn atom is thus fivefold-coordinated, exisiting in a distorted trigonal bipyramidal geometry with the Sn atom lying 0.1963(5) Â out of the C3 plane in the direction of the 0(1) atom.The axial O-Sn-O angle is 173.8(2)°.The structure reported here resembles closely that found for the Me3Sn analogue (see réf. 1 ).Is is noted that the disparity in the Sn-O bond distances is greater in the Et3Sn species (i.e.0.437 Â cf.0.358 Â).Both structures conform to a common motif, i.e. trans-C3Sn02, found for similar compounds (see ref.2).Note, the H postion of the hydroxyl group was not located.C20H26N2O3Sn, monoclinic, P12]/cl (No. 14), a =8.526(4)Â, b =24.715(5)Â, c =10.698(3) Â, β =107.95(3)°,V =2144.6À 3 , Ζ =4, R(F) =0.045, R»(F) =0.042.

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