Spectra of 4′-[4-(3-Pyridyl)Phenyl]-2,2′:6′,2"-Terpyridine and Its Metal Complexes

Multitopic ligand,4′-[4-(3-pyridy)phenyl]-2,2′:6′,2-terpyridine(L) was prepared.The UV-visible absorption and the fluorescence emission spectra of ligand L with transition metals(Zn2+,Cu2+ and Co2+) were investigated.The results indicated that the absorption peak of ligand L lie at 295nm in 95% ethanol solution and a new peak of the metal complexes appeard at 330nm.Compared with L,an enhancement in fluorescence was detected upon the addition of Zn2+ in ethanol solution and a distinct red shift was observed.However,its fluorescence was efficiently quenched by the addition of Cu2+ and Co2+,respectively.As a result,the multitopic ligand of L could not only act as linkers for the metal-directed building blocks,but also act as potential flourescent materials.