Nitroaromatic explosives detection by a luminescent Cd(II) based metal organic framework

详细信息    查看全文

• 作者：Shibashis Halder^a ; Pritam Ghosh^b ; Corrado Rizzoli^c ; Priyabrata Banerjee^b ; ^d ; Partha Roy^a ; ^{proy@chemistry.jdvu.ac.in}
• 关键词：Cd-based MOF ; Nitroaromatics ; Fluorescence ; Quenching ; DFT
• 刊名：Polyhedron
• 出版年：2017
• 出版时间：17 February 2017
• 年：2017
• 卷：123
• 期：Complete
• 页码：217-225
• 全文大小：2361 K
• 卷排序：123

文摘

A Cd(II) based coordination polymer, [Cd(3-bpd)(N(CN)2)2]n (1), where 3-bpd is 1,4-bis(3-pyridyl)-2,3-diaza-1,3-butadiene, has been synthesized and characterized by standard methods including single crystal X-ray diffraction technique. Singly crystal X-ray diffraction analysis shows that it is a 3-dimensional metallo-organic framework. 1 exhibits strong emission intensity in dispersed acetonitrile at 430 nm when it is excited at 340 nm. Among different explosive and pollutant nitroaromatic compounds (epNACs), trinitrophenol (TNP) is able to quench emission intensity of 1 drastically making 1 as the turn-off chemosensor for TNP. Other epNACs, e.g. 2,4,6-trinitrotoluene (TNT), 2,6-dinitro toluene (2,6-DNT), nitrobenzene (NB), 1,3-dinitro benzene (1,3-DNB), 3,4-dinitrotoluene (3,4-DNT) and 4-nitrobenzoic acid (4-NBA) cannot quench the emission intensity of 1 significantly. The quenching constant value of 1 for TNP has been determined to be 7.16 × 104 M−1. Limit of detection of the complex towards TNP is 6 × 10−5 M. Resonance energy transfer (RET) is involved in the transfer of energy from the electronically excited donor, 1 to the acceptor, TNP thereby quenching the emission intensity. Some theoretical calculations have been performed to support the electronic transitions and the proposed mechanism.