摘要:
Reaction of the oxa-thia macrocycle 1,10-dithia-4,7,13,16-tetraoxacyclooctadecane ([18]aneO(4)S(2)) in a 1:1:1 mol ratio with SbCl3 and SbCl5 in MeCN gave [SbCl2([18]aneO(4)S(2))][SbCl6] which contains an eight-coordinate cation. In the absence of SbCl5, the compounds [SbCl3([18]aneO(4)S(2))], and [SbCl2([18]-aneO(4)S(2))](2)[Sb3Cl11] form. Crystals of [SbCl2([18]-aneO(4)Se(2))](2)[Sb3Cl11] ([18]aneO(4)Se(2) = 1,10-diselena-4,7,13,16-tetraoxacyclooctadecane) were also obtained. The reaction of Sbl(3) with [18]aneO(4)S(2) gave [Sbl(2)([18]aneO(4)S(2))]]Sb2I7], which has a similar cation to the chloro-complexes. The smaller ring, 1,4-dithia-7,10,13-trioxacyclopentadecane ([15]aneO(3)S(2)) formed the discrete eight coordinate complex [SbCl3([15]aneO(3)S(2))]. However, the small macrocycle 1,4,-dithia-7-oxacyclononane ([9]aneOS(2)) gave [SbCl3([9]aneOS(2))] which is polymeric with a double chain structure involving exo-coordination of S-donors from two different ligands to the antimony and a long endo interaction (S-2) with a third macrocycle. The neutral SbF3 complexes, [SbF3([18]aneO4(S2))], [SbF3([18]aneO(4)Se(2))] and [SbF3([15]aneO(3)S(2))] are also described. X-ray crystal structures are reported for [SbCl2([18]aneO(4)S(2))][SbCl6], [SbCl2([18]aneO(4-)S(2))](2)[Sb3Cl11], [SbCl2([18]aneO(4)Se(2))](2)[Sb3Cl11. [SbI2([18]aneO(4)S(2))[Sb2.5I9.5], [SbCl3([15]aneO(3)S(2))], [SbF3([15]aneO(3)S(2))] and [SbCl3([9]aneOS(2))]. Comparisons are drawn with the Sb(III) complexes of crown-ethers and thia-macrocycles. (C) 2013 Elsevier Ltd. All rights reserved.