Crystal and molecular structure of 1,2 : 3,4-di-mu(2)-[2,6-dichlorophenyl)amino]benzeneacetato-O,O-1,3-bis [(2,6-dichlorophenyl)amino]benzeneacetato-O-1,2,4 : 2,3,4-di-mu(3)-oxo-tetrakis[di-n-butyltin(IV)]: {[nBu(2)Sn(O2CCH2C6H4N(H)C6H3Cl2)](2)O}(2)

The crystal and molecular structure of 1,2:3,4-di-mu(2)-[(2,6-dichloropheny l)amino]bezenecetato-O,O-1,3-bis-[(2, 6-dichlorophenyl)amino]benzeneacetato -O-1,2,4:2,3,4-di-mu(3)-oxo-tetrakis[di-n-butylin(IV)], {[nBu(2)Sn(O2CCH2C6 H4N(H)C6H3Cl2)](2)O}(2), C88H112Cl8N4O10Sn4, has been determined at room te mperature. The colorless crystals are monoclinic, space group C2/c with uni t cell dimensions a = 31.447(2) Angstrom, b = 11.27(4) Angstrom, c = 29.423 (4) Angstrom, beta = 114.479(6)degrees, Z = 4 and D-x = 1.501 Mg m(-3). The structure was solved by direct methods and refined by a full-matrix least- squares procedure to final R = 0.044 using 5742 reflections. The tetranucle ar structure, which has 2-fold symmetry, features a central Sn2O2 unit with two additional tin atoms linked at O. Pairs of tin atoms are bridged by bi dentate carboxylate ligands and the external tin atoms have their coordinat ion geometry completed by a monodentate carboxylate ligand. The tin atom ge ometries are similar and are based on a trigonal bipyramidal arrangement.