Syntheses and Structural Characterizations of the Three-dimensional Polymers [(R₂Sn)₃{Co(CN)₆}₂·X] (R = Vinyl, Propyl, Butyl; X = Solvent)

Three coordination polymers with the general formula [(R 2 Sn) 3 {Co(CN) 6 } 2 ·X], R = vinyl( 1 ), butyl( 2 ), and propyl ( 3 ), were synthesized and structurally characterized. The three compounds are homologues with similar cell dimensions. They all crystallize in space group P 6 3 / mcm [ 1, a = 13.034(1) Å, c = 13.678(1) Å; 2, a = 13.741(1) Å, c = 13.363(1) Å; 3, a = 13.477(1) Å, c = 13.362(1) Å]. The structures are formed by linking R 2 Sn units with distorted octahedral Co(CN) 6 fragments. Each tin atom is coordinated by four Co(CN) 6 units and adopts an octahedral SnN 4 C 2 arrangement. Channels along the c axis are occupied by disordered alkyl groups. The channels have “bottlenecks” which in 1 prevent facile release of solvent molecules. No solvent molecules are found in 2 and 3, since the channel space is occupied by the alkyl groups.