Effect of solvent on the architectures of six Ag(I) coordination polymers based on flexible and quasi-flexible organic nitrogen donor ligands.

The present work describes the synthesis, full characterization and architectural diversity of six new bioactive silver–organic networks, namely the coordination polymers [Ag(bpa) 2 (CF 3 SO 3 )(H 2 O)] n ( 1 ), {[Ag 2 (PPh 3 ) 2 (bpa) 2 ](CF 3 SO 3 )} n ( 2 ), [Ag(bpe)(CF 3 SO 3 )] n ( 3 ), [Ag(bpe)(CF 3 SO 3 )(CH 3 CN)] n ( 4 ), {[Ag(PPh 3 )(μ-bpe)] 1.5 (BF 4 )} n ( 5 ) and [Ag(bpp)(CF 3 SO 3 )(CH 3 CN) 2 ] n ( 6 ), which are generated via a mixed-ligand strategy using 1,2-bis(4-pyridyl)ethane (bpa), 1,2-bis(4-pyridyl)ethene (bpe) or 1,3-bis(4-pyridyl)propane (bpp) as the main building block and triphenylphosphine (PPh 3 ) as an ancillary ligand source. Complexes 1 – 6 were well characterized by IR, 1 H and 31 P NMR spectroscopy, elemental analysis, fluorescence, THz spectroscopy and single-crystal X-ray crystallography. The complexes 1 , 2 and 4 – 6 have a topological network structure. The type and coordination modes of the bipyridine derivatives and the choice of solvent play a key role in defining the dimensionality as well as the structural and topological features of the resulting networks. Analysis of structures revealed that complex 1 possesses a (5 4 , 6 2 ) topological network structure connected through the bridging ligand bpa. Complex 2 has a dinuclear structure and displays a topologically promising architecture connected through hydrogen bonds between the C H groups of aromatic ring and anions. Complexes 3 and 4 possess different 1D infinite chains which are linked by the bridging ligand bpe, and complex 4 can be simplified as having a three-dimensional mesh topology. Complex 5 has a (9 3 , 3 3 ) topological network structure connected through the bridging ligand bpe. Like complex 4 , complex 6 possesses 1D infinite chains through the bridging ligand bpp, which are linked by hydrogen bonds to form a 3D topological network. Complexes 2 and 4 are generated from CH 2 Cl 2 /CH 3 OH (5:5) and CH 3 CN respectively, while the other complexes are obtained from CH 3 CN/H 2 O (5:5). In addition, complexes 1 – 6 exhibit interesting fluorescence in the solid state at room temperature. [ABSTRACT FROM AUTHOR]