[2,6-{O(CH2CH2)2NCH2}2C6H3]SbCl2 - A NEW PINCER LIGAND-CONTAINING ORGANOANTIMONY(III) COMPOUND. MOLECULAR STRUCTURE AND SUPRAMOLECULAR ASPECTS

The monoorganoantimony(III) dichloride [2,6-{O(CH2CH2)(2)NCH2}(2) C6H3]SbCl2 (2) was prepared by reacting [2,6-{O(CH2CH2)(2)NCH2}(2) C6H3]Li, obtained in situ from 2,6-[O(CH2CH2)(2)NCH2](2)C6H3Br (1) and nBuLi in hexane, with SbCl3 in Et2O, in 1:1 molar ratio. The crystal and molecular structure of the 2(.)CHCl(3) was established by single-crystal X-ray diffraction. A substitutional Cl/Br disorder was identified in the crystal of 2, with average site occupancy factors of 87:13. In the molecule of 2 the organic group acts as an NCN-pincer ligand; both nitrogen atoms are strongly coordinated to the metal center [N-Sb 2.471(3), 2.480(3) angstrom] in trans to each other [N-Sb-N 151.07(9)degrees], thus leading to a distorted square pyramidal (NCN)SbX2 geometry, with a T-shape arrangement of the primary bonds of the CSbX2 core [Cl-Sb-Cl 171.65(12)degrees; Br-Sb-Br 170.1(4)degrees]. Intermolecular interactions, i.e. (OH)-H-.... and (ClH)-H-. . . (residual Br atoms are neglected), were found in the solid state resulting in a 3D supramolecular architecture.