Chromone-Based Cd(II) Fluorescent Coordination Polymer Fabricated to Study Optoelectronic and Explosive Sensing Properties.

Here, electrical conductivity and explosive sensing properties of multifunctional chromone-Cd(II)-based coordination polymers (CPs) ( 1 - 4 ) have been explored. The presence of different pseudohalide linkers, thiocyanate ions, and dicyanamide ions resulted in 1D and 3D architecture in the CPs. Thin film devices developed from CPs 1 - 4 (complex-based Schottky devices, CSD1 , CSD2 , CSD3 , and CSD4 , respectively) showed semiconductor behavior. Their conductivity values increased under photo illumination (1.37 × 10 -5 , 1.85 × 10 -5 , 1.61 × 10 -5 , and 2.01 × 10 -5 S m -1 under dark conditions and 5.06 × 10 -5 , 8.78 × 10 -5 , 7.26 × 10 -5 , and 10.21 × 10 -5 S m -1 under light). The nature of the I - V plots of these thin film devices under light irradiation and dark are nonlinear rectifying, which has been observed in Schottky barrier diodes (SBDs). All four CPs ( 1 - 4 ) exhibited highly selective fluorescence quenching-based sensing properties toward well-known explosives, 2,4-dinitrophenol (DNP) and 2,4,6-trinitrophenol (TNP). The limit of detection (LOD) values are 55, 28, 27, and 31 μM for TNP and 78, 44, 32, and 41 μM for DNP for complexes 1 - 4 , respectively. A structure property correlation has been established to explain optoelectronic and explosive sensing properties.