Coordination polymers based on Mn(II) and BPNO with selective and recyclable sensing of nitroaromatics

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Detection of nitroaromatic compounds as both potential explosives and environmental pollutants is important for national homeland security, environmental protection or military applications. Current detection methods are based on some sophisticated instruments including energy dispersive X-ray diffraction, gas chromatography coupled with mass spectrometry, nuclear quadrupole resonance, surface enhanced Raman spectroscopy, neutron activation analysis, electron capture detection, and cyclic voltammetry. These instruments are very expensive and not easily accessible in most conditions. As a simpler, quicker and less expensive method, the sensitive optical detection could potentially be widely employed. The coordination polymers (CPs) could be efficiently modulated by both analyte-metal and analyte-ligand interactions. Thus the CP-based fluorescent detection of nitro-explosives displays fast, sensitive and reversible compared with other methods. It is necessary to rationally design and synthesize appropriate ligands to prepare the stable and bifunctional CPs. In this work, three Mn(II) coordination polymers [Mn2(1,4-NDC)2(BPNO)2(H2O)6·(BPNO)3] n ( 1 , 1,4-H2NDC=1,4-naphthalenedicarboxylic acid, BPNO=1,2-Bis(4-pyridyl)- N , N ′-dioxide), [Mn2(BPNO)(1,4-NDC)2·