2 : 1 adducts of halotris(p-tolyl)tin(IV) with 1,9-bis(4-oxopent-2-en-2-ylamino)-3,7-di-thianonane

The structures of (mu-5,15-diaza-8, 12-dithianonadeca-3,16-diene-2,18- dion e-O,O')bis[halotris(p-tolyl)tin] (halo is bromo, [Sn2Br2(C7H7)(6)(C17H30N2O 2S2)], iodo, [Sn-2-I-2(C7H7)(6)((C17H30NOS2)-O-2-S-2)], and chloro} have be en determined. The three compounds are isostructural, but the chlorine-cont aining structure is imprecise and its structure data are not reported. Of t he six potential coordination sites on the bridging dithianonane ligand, on ly the two carbonyl O atoms are bonded to Sn atoms [Sn-O = 2.30(1)-2.35(1) Angstrom for the bromine and iodine compounds]. The carbonyl O atoms also i nteract with amine N atoms through N-H ... O hydrogen bonds [N-O = 2.62 (2) -2.66(1) Angstrom]. The direction of greatest expansion [Delta c (space gro up Pna2(1)) = 0.598 (3) Angstrom at 296 K when Br is changed to I] is nearl y perpendicular [76(1)88(1)degrees] to the tin-halogen bonds.