1,10-菲啰啉-四氰基乙烯配合物发光性质的研究

摘要

基于探针在近年来得到发展,制备光学性能更为良好的发光材料成为当前化学工作者的研究热点,该工作预制备光学性能更为优良的新型发光材料,以满足人们日常生活及医疗等方面的需求.该工作以四氰基乙烯(TCNE)为第一配体,以1,10-菲啰啉(phen)为第二配体,通过分子间的电荷转移,合成1,10-菲啰啉-四氰基乙烯的电荷转移络合物,并对此反应机理进行初步探索.运用紫外光谱法、荧光光谱法和拉曼光谱法对配合物进行表征及发光性质的研究.比较配合物和配体的紫外吸收峰发现,配合物的吸收均源于配体1,10-菲啰啉的吸收,说明TCNE与Phen形成了稳定的络合物.同时分析荧光光谱,发现配合物的发射峰与配体四氰基乙烯相似,可认为配合物的荧光来自于配体的π—π*电子跃迁.从拉曼图谱中可以看出,在1000~1600 cm -1处配合物的拉曼强度比TCNE配体有明显的增强.共振拉曼散射在1000~1600 cm -1处振动模式被强耦合,由于分子间的电荷转移使得这些共振拉曼峰被强烈增强.分析结果表明,在一定条件下,1,10-菲啰啉能与四氰基乙烯形成稳定的络合物,且光学性能显著增强.上述研究,合成并研究了1,10-菲啰啉-四氰基乙烯荷移络合物的光学性质,为设计、合成荧光性能良好的配合物提供了实验依据,并为探索和开发新的核酸探针做出了贡献.%Based on the development of probes in recent years,the preparation of luminescent materials with better optical properties has become a hotspot of current chemical workers.This work is intended to prepare a new type of luminescent material with better optical performance to meet people's daily life and medical de-mands.The complex of tetracynoethylene-1,10-phenanthroline was formed with tetracynoethylene(TCNE) and 1,10-phenanthroline(Phen)under specific conditions and characterized by UV-Vis spectrometry,Fluores-cence spectrometry and Raman scattering spectrometry.Then the reaction mechanism was explored prelimina-rily.The absorption peaks of complex was compared with the absorption peaks of ligands.It showed that the absorption of complexes was due to the absorption of ligand 1,10-phenanthroline,indicating that tetracynoeth-ylene and 1,10-phenanthroline formed stable complexes.At the same time,the fluorescence spectra were ana-lyzed.It was found that the emission peak of the complex was similar to that of the ligand tetracynoethylene, and the fluorescence of the complex was believed to be derived from the π—π*electron transition of the ligand. It can be seen from the Raman spectra that the Raman intensity of the complex at 1 000~1 600 cm-1was sig-nificantly enhanced compared with the Raman intensity of tetracynoethylene ligand.The resonant Raman scat-tering was strongly coupled at 1 000~1 600 cm -1,and these resonant Raman peaks were strongly enhanced due to the charge transfer between molecules.The results suggested that the ligand tetracynoethylene had co-ordinated successfully with ligand 1,10-Phenanthroline and the fluorescence intensity was significantly im-proved.At the same time,the absorption of complex mainly came from the ligands absorption.In the above study,the 1,10-Phenanthroline-tetracyanoethylene charge transfer complex was synthesized for the first time and its optical properties were studied.This study provided an experimental basis for the design and synthesis of complexes with superior luminescent properties,promoting the progress of the career of the optics and con-tributed the exploration and development of new nucleic acid probes.