A Sensitive Fluorescent Sensor for 4-nitrophenol in Aqueous Solution Based on a Cobalt（Ⅱ） Complex
作者单位：College of ChemistryChemical Engineering and Materials ScienceSoochow University
会议名称：《中国化学会第九届全国无机化学学术会议》
会议日期：2015年
学科分类：081704[工学-应用化学] 07[理学] 080202[工学-机械电子工程] 08[工学] 0817[工学-化学工程与技术] 070302[理学-分析化学] 0703[理学-化学] 0802[工学-机械工程]
关 键 词：Cobalt(Ⅱ) complex 4-nitrophenol flourescent sensor luminescent quenching
摘 要：Detection of nitroaromatic compounds is important for national homeland security,military applications,forensic investigations,and environmental *** detection methods rely on trained sniffer dogs or sophisticated *** approaches need very expensive instruments and they are not easily accessible in most *** coordination polymers（CPs）or metal organic frameworks（MOFs）have proved to be attractive candidates for the detection of trace amounts of nitroaromatics.[1,2]This is mainly because can be efficiently modulated by both analyte–metal and analyte–ligand interactions and displays fast,highly sensitive,and reversible nitro-explosives sensing compared with other methods.[3]In this paper,we selected1,3,5-tri（4-vinylpyridyl）-benzene（tvpb）as a ligand to react with Co（NO3）2·6H2O and 2,2’-biphenyldicarboxylic acid（2,2’-H2bpdc）,producing one three-dimensional polymer[Co（tvpb）（2,2’-H2bpdc）]n（1）.In 1,each Co is coordinated by three O atoms from two bpdc ligands and three N atoms from three tvpb ligands（Fig.1a）.The average Co–O and Co–N bond lengths are 2.172（3）Aand 2.157（3）*** Co center and each tvpb ligand can be viewed as a 5-connected node and a 3-connected node,***,the structure of 1 can be simplified into a 3D（3,5）-connected topology（Fig.1b）.A finely ground sample of 1（2 mg）was suspended in 2 m L of water,sonicated for 1 h and exhibited an emission at 412 nm when excited at 291 *** 1 is very stable in water.A dispersed suspension of 1 in H2O also displays strong fluorescence emission and exhibits good selectivity and sensitivity toward nitroaromatic（Fig.1c）.