In Situ Oxidation of Pyridyl-Dihydrobenzoimidazoquinazoline and the Synthesis of a Highly Luminescent Cd(II) Coordination Polymer: A Promising Candidate for Mutagenic Nitroaromatic Detection and Device Fabrication.

Pyridyl-substituted imidazoquinoline, a potent fluorescent framework, is advantageous to architect multifunctional coordination networks for sensing and fabricating emergent electrical conductors. In this work, a Cd(II)-based one-dimensional (1D) coordination polymer (1D CP), [Cd(glu) ₂ ( pbiq ) ₂ (H ₂ O)] _n ( 1 ), [ H ₂ glu = glutaric acid and pbiq = 4-(6-(pyridin-4-yl)benzo[4,5]imidazo[1,2- c ]quinazoline)], has been structurally confirmed by single-crystal X-ray crystallography. The H-bonding and π···π interactions built a three-dimensional (3D) supramolecular structure that strongly emits at 416 nm in acetonitrile suspension. Potentially intrusive nitroaromatics (NAs) and trinitrophenol (TNP) selectively quench the strong emission of 1 , and the highest quenching is noted in the case of TNP. A detection limit (limit of detection (LOD)) of 1.51 × 10 ^-7 M for TNP is determined. The band gap (3.31 eV) of 1 recognizes semiconducting behavior, and an electronic device is fabricated. The correlation of current vs voltage ( I - V plot) reveals a substantial non-ohmic electrical conductivity of 1 (Λ: 1.10 × 10 ^-5 S m ^-1 ) along with a low energy barrier (Φ _B : 0.69), and the series resistance ( R _s ) becomes 6.21 kΩ.