Synthesis and structure of tetra-p-tolylantimony complexes [(4-MeC6H4)4Sb] 2 + [Hg2I6]2−, [(4-MeC6H4)4Sb] 2 + [HgI4]2−, [(4-MeC6H4)4Sb] 3 + [Sb3I12]2−, and [(4-MeC6H4)4Sb]+[ReO4

Abstract

Complexes [(4-MeC6H4)4Sb]2+[Hg2I6]2− (I), [(4-MeC6H4)4Sb]2+[HgI4]2− (II), [(4-MeC6H4)4Sb]3+[Sb3I12]2− (III), were synthesized by reactions of tetra-p-tolylantimony iodide with mercury iodide and antimony iodide, respectively. Tetra-p-tolylantimony perrhenate [(4-MeC6H4)4Sb]+[ReO4]− (IV) was prepared from tetra-p-tolylantimony chloride and sodium perrhenate in acetone. Crystal structures of complexes I, II, and IV were determined by X-ray crystallography. Mercury and rhenium atoms have tetrahedral coordinations in these complexes. The Hg-I and Re-O distances in the structures of I, II, and IV vary within 2.7719(13)–2.7908(12)A, 2.7028(3)–2.9163(3) A, and 1.693(3)–1.744(3) A, respectively. Antimony atoms in two crystallographically independent trinuclear centrosymmetric [Sb3I12]2− anions of complex III have an octahedral environment. Each terminal SbI3 fragment (Sb-It, 2.8265(9)–2.8333(10)A) is bound to the central atom through tree bridging iodine atoms (Sb(2)-Ibr, 3.2275(9)–3.3620(10)A). The distances between the central Sb atom and bridging iodine atoms are much shorter (Sb(1)-Ibr, 3.0153(6)–3.0316(6) A; Sb(3)-Ibr, 2.9926(6)–3.0074(6) A).