A diamine ligand with long 鈥渁rms鈥?and its corresponding dinuclear rhenium(I) complex: Synthesis, characterization, photophysical property, and sensing activity towards molecular oxygen

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• 作者：Xiao-yong Xu^a ; ^b ; ^{dreamxxy01@163.com} ; Han-ning Xiao^b
• 关键词：Re(I) complex ; Alkyl chain ; Oxygen sensing ; Molecular sieve
• 刊名：Journal of Luminescence
• 出版年：2012
• 期刊代码：54_00222313
• 类别：ch
• 出版时间：September, 2012
• 卷：132
• 期：9
• 页码：2251-2258
• 文件大小：840 K

摘要

In this paper, we synthesize a novel diamine ligand of 4,7-dinonadecyl-1,10-phenanthroline (DN-Phen) with two long alkyl chain arms serving as a shield and its corresponding dinuclear Re(I) complex of Re₂(CO)₆(bpy)(DN-Phen)₂ (bpy=4,4鈥?bipyridine), aiming at an optical sensor immune to the surrounding interferences. Its geometric and electronic structures are investigated, which suggest that the introduced long alkyl chains act as a shield for the excited state of emissive center. The promising photophysical parameters of Re₂(CO)₆(bpy)(DN-Phen)₂, including the immunity of emission towards the surrounding interferences and long excited state lifetime, make itself a potential probe for oxygen detection. By doping Re₂(CO)₆(bpy)(DN-Phen)₂ into two silica matrixes of MCM-41 and SBA-15, oxygen sensing performances of the resulted composite materials are investigated. Finally, a high sensitivity of 20.1 is realized, with short response/recovery time of 8 s/42 s. Here, sensitivity is defined as the ratio of emission maximum under pure nitrogen to emission minimum under pure oxygen, response and recovery times are the times for a sample to lose (response time) or recover (recovery time) 95%of its emission maximum upon periodically changed atmosphere.