Three Cd­(II) based coordination polymers (CPs) (1–3) are designed using 3-aminoquinoline and 5-aminoquinoline based Schiff base ligands and thiocyanate and dicyanamide as bridging ligands. Pseudohalide linkers play a crucial role in the architecture of the CPs. These compounds are prepared under an ambient condition with high yield. The I–V characteristics of the 1–3 based thin film devices (Al/complex interface) under dark and illumination conditions are nonlinear rectifying nature, which is the signature of a Schottky barrier diode (SBD). The rectification ratio (I on/I off) of the SBDs under dark condition at ±2 V has been obtained as 16.41, 15.48, and 14.73 and under illumination conditions; the same has been evaluated as 67.18, 46.23, and 37.69 for 1, 2, and 3, respectively. The photoresponsivity of the device is found to be 5.52, 2.89, and 2.54 for 1, 2, and 3 based SBDs, respectively. The enhancement of conductivity under photoilluminated conditions depends on π-electron donor capacity of Schiff base ligands and the length of pseudohalide linkers of 1–3. Again, depending on the binding fashion of the coordinating ligands, three CPs (1–3) exhibit different selectivity toward nitroaromatic sensing. In 2,4,6-trinitrophenol (TNP) sensing, CPs follow the order 3 > 2 > 1. CP 3 has the highest quenching constant among the other two CPs along with a prominent selectivity and lowest detection limit in response to TNP.

A newly designed multifunctional two-dimensional coordination polymer (2D CP) {[Cd­(suc)­(4-nvp)2]­·2H2O} n , (1), (H2suc = succinic acid and 4-nvp = 4-(1-naphthylvinyl)­pyridine) has been synthesized and characterized by X-ray crystallography. The solid-state structure of the compound 1 reveals the formation of three-dimensional supramolecular architecture via C–H···π and π···π stacking interactions. Interestingly, the supramolecular assembly of compound 1 exhibits electrical conductivity in the semiconducting nature. A deep insight into the electrical study of compound 1 carried out by dielectric characterization reveals the enhancement of conductivity upon light soaking. Thus, the compound has potential applicability in the fabrication optoelectronic devices. On the other hand, compound 1 shows sensing activity toward explosive nitroaromatic compounds (epNACs), which threatens devastating terror attacks ultimately responsible for massive loss of life. Besides, the nitroaromatic compound (NAC) 2,4,6-trinitrophenol (TNP) can enter inside the mammalian digestive cycle, wherein it gets metabolized into a mutagenic species, picramic acid, which causes health hazards. Compound 1 can detect TNP with the most acceptable fluorescence method. Together with its optoelectronic device fabrication and explosive sensing application, the synthesized material can be used as a potential candidate for sustainability.

Two luminescent MOFs, Mn@MOF and Cd@MOF, have been reported herein, which are capable of selectively detecting 2,4,6trinitrophenol (TNP), one of the potent organic water pollutants in the class of mutagenic explosive nitroaromatic compounds (epNACs). It is perceived that the d 10 -based Cd(II)-constituting MOF shows a better response in the realm of TNP-like nitroaromatic sensing in comparison to the d 5 -based Mn@MOF which may possess lower electron density over the conjugated building blocks. The sensing competences of these chemosensors have been explored by means of various spectroscopic experimentations, and it is observed that for both d 5 and d 10 -containing MOFs, the initial fluorescence intensity is significantly quenched in response to an aqueous solution of TNP. However, Cd@MOF is more selective and sensitive toward TNP over several other epNACs than Mn@ MOF. The high chemical stability of the MOF samples, as well as its amusing sensing efficiency of Cd@MOF, further instigated to investigate the sensing ability in various environmental specimens like soil and water culled from several zones of West Bengal, India.