Crystal and molecular structure of the six-co-ordinate antimony(III) complex SbCl3,L, where L =N,N′-dimethyloxamide. Unusual O,O ligand binding leading to four-membered Sb(µ-O)2Sb ring formation
Abstract
Antimony trichloride reacts with N,N′-dimethyloxamide (L) to form SbCl3L. Crystals are triclinic, space group P, Z= 2, with a= 7.492(8), b= 8.954(11), c= 10.544(10)Å, α= 68.1(1), β= 111.0(1), and γ= 111.0(1)°. 1 617 Independent reflections above background were collected on a diffractometer and the structure refined to R 0.065. The unit cell contains two SbCl3 molecules together with two independent oxamide ligands both with an imposed centre of symmetry. The structure is polymeric with the ligands acting as bridges between SbCl3 cores. The antimony atom is strongly bonded to three chlorine atoms [2.400(3), 2.387(3), and 2.350(5)Å] and weakly bonded to three oxygen atoms [2.837(9), 2.722(13), and 2.838(8)Å].