Influence of the counteranion on silver(I)–dithioether coordination polymers
摘要:
In order to rationalize the effect of the size and coordinating ability of counteranions upon the structure of Ag(I)-dithioether coordination polymers, a series of such polymers has been synthesized by the combination of the 1,3-bis(methylthio)propane building block and AgX silver salts (X = CIO4- (1), BF4- (2), CF3SO3- (3), SbF6- (4), C6H5COO- (5), CF3COO- (6), CF3CF2CF2COO- (7) and -OOCCF2CF2COO- (8)). Except in two cases, all complexes form 1D-coordination polymers.Coordination polymers 1 and 2 are isostructural with tubular cationic chains. Coordination polymers 3 and 4 have similar cationic chains, except that 3 incorporates in its crystal structure an additional acetone molecule. In 5, neighboring [(C6H5COO)Ag](2) dimers are linked via the oxygen atom of the benzoate group to build up a [(C6H5COO)Ag](infinity) 1D-dimensional coordination polymer. The chains are further interconnected by ligand molecules that bind two consecutive silver atoms.The short Ag center dot center dot center dot Ag contacts (2.920(1)-3.363(1)angstrom) in 5,7 and 8 may indicate the presence of weak silver-silver interactions. Coordination polymer 6 forms a neutral 2D-coordination network, in which the trifluoroacetate anions complete the coordination sphere of the metal center. In 7, the neutral 1D-coordination polymer is made up through unsupported silver-silver interactions. The structure of 8 is made up of the same chains of 7 that are connected to each other by the tetrafluorosuccinate anions, resulting in a 2D-supramolecular network. The stoichiometries of polymers 1 and 2 were found to depend on the metal-to-ligand ratio of the starting materials, contrary to the stoichiometries of the other coordination networks 3-8. (C) 2010 Elsevier Ltd. All rights reserved.