Novel Polymeric Metal Complexes of 2,7-Bis[2-(2′-Pyridyl) Benzimidazole]- 9,9′-Dioctylfluorene with Cu(II)and Zn(II): Synthesis and Luminescence Properties

Abstract

A novel ligand, 2,7-bis[2-(2′-Pyridyl)benzimidazole]- 9,9′-dioctylfluorene (BPDOF) and its polymeric complexes with copper(II) and zinc(II) were successfully synthesized and characterized by 1H NMR, FT-IR, elemental analysis, UV-vis, conductivity measurements and gel permeation chromatography. The UV–vis absorption, fluorescence spectra, and thermal properties of these complexes were investigated at room temperature. The experimental results show that polymeric metal complexes BPDOF-Cu(II) and BPDOF-Zn(II) emit purple/green luminescence at 430 and 509 nm in DMF solution and emit green luminescence at 495 and 527 nm in the solid state. Thermal properties measurement and analysis show that they have good thermal stabilities. Synthesis route: 2,7-bis[2-(2′-Pyridyl) benzimidazole]- 9,9′-dioctylfluorene (BPDOF) was synthesized using 2-(2′-Pyridyl)benzimidazole and 2,7-dibromo-9,9′-dioctylfluorene by Ullmann condensation. Polymeric metal complexes of the corresponding were synthesized with CuCl2 · 2H2O, ZnCl2.