Reactivity of a Cadmium-Terpyridine Complex:[Cd(L~1)(NO3)2(H2O)](L~1 =(4-(4-bromophenyl)-2,2':6',2''-terpyridine)

摘要

A novel pincer-type ligand L~2(4'-(4-(6-methoxypyridin-3-yl)phenyl)-2,2':6',2"-terpyridine),a terpyridine derivative,was prepared by Suzuki-Miyaura C-C coupling.Under heating conditions in ethanol,ligands L~1(4'-(4-bromophenyl)-2,2':6',2"-terpyridine)and L~2 reacted with Cd(NO3)2-4H2O to produce [Cd(L~1)(NO3)2(H2O)](1)and [Cd(L~2)(NO3)2(H2O)](H2O)(2),respectively.In complexes 1 and 2,the seven-coordinate cadmium metal is coordinated to one terpyridine ligand,two nitrato ligands,and an aqua ligand.Under heating conditions in acetonitrile at 120 °C,complex 1 was converted into a 1:1 mixture(3)of [Cd2L~2(NO3-κ~3O,O',O")(NO3-κ~2O,O')3](3a)and [CdL(NO3-κ~2O,O')2](3b).When complex 1 was treated with 4,4'-bipyridine(bpy)under hydrothermal conditions,a one-dimensional linear coordination polymer [[Cd(L~1)(bpy)(NO3)](NO3)(H2O)2]_∞(4)was produced.Complex 1 reacted with 4-((E)-2-(pyridin-4-yl)vinyl)pyridine(bpe)in ethanol under microwave-heating conditions to produce a dimeric complex [Cd2(L~1)2(bpe)(EtOH)2(NO3)2)](NO3)2(5).Solid-state photoluminescent spectra of all complexes displayed a ligand-based π-π* emission band.