Chun‐Wei Yeh, J. Chen, Ju-chun Wang
Dec 12, 2008
Citations
0
Influential Citations
27
Citations
Journal
Polyhedron
Abstract
Abstract The new dipyridyl ligands N,N′-(methylenedi-p-phenylene)bis(pyridine-4-carboxamide), L1, and N,N′-(methylenedi-p-phenylene)bis(pyridine-3-carboxamide), L2, incorporating amide spacers have been synthesized and reacted with metal salts to give complexes of the types [Cu(L1)2X2]∞ (X = Cl, 1 and X = Br, 2), {[Cu(L1)2(DMF)](NO3)2}∞, 3, {[Ag2(L1)2](SO4)}∞, 4, and {[Cu(L2)(DMSO)2(NO3)](NO3)}∞, 5. All compounds have been characterized by spectroscopic methods and their structures determined by X-ray crystallography. Complexes 1, 2 and 3 form 1-D double-stranded polymeric chains showing rhombic molecular squares with approximate dimensions of 16.95 × 19.13 A2 for 1, 17.03 × 19.06 A2 for 2 and 16.66 × 19.94 A2 for 3. Complex 4 forms infinite 1-D zigzag polymeric chains, which are interlinked through a series of Ag–O interactions to form wavy 1-D ladder like chains, and complex 5 forms 1-D sinusoidal chains. While the L1 ligands in complexes 1, 2 and 3 adopt the cis conformation and that in complex 4 adopts trans conformation, the L2 ligand in complex 5 adopts the trans-anti conformation. The ligand conformations also differ in the dihedral angles between the pyridyl and phenyl rings. All complexes exhibit emissions which may be tentatively assigned as intraligand (IL) π → π∗ transition.