Iodostannates(II) with anionic (1)(infinity)[SnI3](-) chains - the transition from five to six-coordinated Sn-II

The iodostannates (Me4N)(infinity)(1)[SnI3] (1), [Et3N-(CH2)(4)-NEt3](infin ity)(1) [SnI3](2) (2), [EtMe2N-(CH2)(2)-NEtMe2] [SnI3](2) (3), [Me2HN-(CH2) (2)-NH-(CH2)(2)-NMe2H](infinity)(1) [SnI3](2) (4), [Et3N-(CH2)(6)-NEt3](inf inity)(1) [SnI3](2) (5) and [Pr3N-(CH2)(4)-NPr3](infinity)(1)[SnI3](2) 2 DM F (6) with the same composition of the anionic (1)(infinity)[SnI3](-) chain s show differences in the coordination of the Sn-II central atoms. Whereas the Sn atoms in 1 and 2 are coordinated in an approximately regular octahed ral fashion, in compounds 3-6 the continuous transition to coordination num ber five in (Pr4N)(infinity)(1)[SnI3] (7) or [Fe(dmf)(6)](infinity)(1)[SnI3 ](2) (8) can be observed. Together with the shortening of two or three Sn-I bonds, the bonds in Irans position are elongated. Thus weak, long-range Sn I interactions complete the distorted octahedral environment of SnI4 group s in 3 and 4 and SnI3 groups in 5 and 6. Obviously the shape, size and char ge of the counterions and the related cation-anion interactions are respons ible for the variants in structure and distortion.