1D helical Zn metal-organic polymers:Syntheses,structures and fluorescent properties

摘要

Hydrothermal reactions of l,l'-(1,5-pentanediyl)bis-1H-benzimidazole(pbbm)with ZnCl2 afford two 1D helical metal-organic polymers {[ZnCl2(pbbm)] centre dot(H2O)_(1/8)}_n(1)and {[Zn(pbbm)2] centre dot Cl2 centre dot(H2O)_(1/2)}_n(2).Polymer 1 features a 1D single helical architecture,whereas 2 possesses a 1D cationic double helical chain framework.Photoluminescence investigations reveal that both of them display strong emissions in the solid state at room temperature,which could originate from a ligand-to-ligand charge-transfer(LLCT)transition,as confirmed by the molecular orbital(MO)calculations.