Crystal and molecular structure of 1,2;3,4-di-µ-o-aminobenzoato-OO′-1,3-bis(o-aminobenzoato-O)-1,2,4;2,3,4-di-µ3-oxo-tetrakis[di-n-butyltin(IV)]

Abstract

The crystal structure of [{[SnBuⁿ₂(O₂CC₆H₄NH₂-o)]₂O}₂] has been determined by single-crystal X-ray diffraction (298 K); space group P, a= 17.278(9), b= 15.890(9), c= 14.154(8)Å, α= 71.80(9), β= 68.67(8), γ= 82.02(6)°, Z= 2, and R= 0.050 for 2 038 reflections [I > 3σ(I)]. This dimer incorporates two bridging, one effectively isobidentate, and one nearly unidentate carboxy groups. The Sn–O and C–O bond distances, OCO bond angles (non-bridging carboxy groups), ^119mSn Mössbauer, i.r., and n.m.r. (¹H, ¹³C, and ¹¹⁹Sn) spectral data reveal that one molecule, (I), in the dimer has one six-co-ordinate and one five-co-ordinate tin atom while the other, (II), has two six-co-ordinate tin atoms. This stannoxane is the first example of its kind so far reported.