abstract
Three coordination polymers (CPs 1-3) are prepared based on diverse electron-donating properties and coordination arrangements of conjugated ligands. Interestingly, this is also reflected in their photophysical properties. The distinguishable high emissive nature of the luminescent coordina-tion polymer shows its potentiality toward the detection of the perilous substance 2,4,6-trinitrophenol (TNP) or picric acid (PA). TNP has a higher propensity among explosive nitroaromatic compounds (epNACs) due to its significant pi center dot center dot center dot pi interaction with the free benzene moieties present in the CPs. Among CPs 1-3, 2 exhibits the highest sensitivity and selectivity toward TNP because of the most favorable pi-pi stacking with the conjugated organic linker. The calculated limit of detection (LOD) and corresponding quenching constant (KSV) from the Stern-Volmer (SV) plot for 1, 2, and 3 are found to be 0.68 mu M and 7.49 x 104 M-1, 0.41 mu M and 8.01 x 104 M-1, and 1.18 mu M and 8.1 x 104 M-1, respectively. The fluorescence quenching mechanism is also highly influenced by their structure and coordination arrangement.
keywords
METAL-ORGANIC FRAMEWORKS; CADMIUM(II) COMPLEXES SYNTHESIS; EFFECTIVE CORE POTENTIALS; CRYSTAL-STRUCTURES; SUPRAMOLECULAR INTERACTIONS; MOLECULAR CALCULATIONS; FLUORESCENCE DETECTION; LIGANDS SYNTHESES; LUMINESCENT; 2,4,6-TRINITROPHENOL
subject category
Chemistry
authors
Ghorai, P; Hazra, A; Mandal, J; Malik, S; Brandao, P; Banerjee, P; Saha, A
our authors
Paula Cristina Ferreira da Silva Brandão
Assistant Researcheracknowledgements
A.S. gratefully acknowledges the financial support of this work by the DST, India (Sanction no. SB/FT/CS-102/2014, dated-18.07.2015) , and RUSA 2.0, Government of India (Sanction no. R-11/262/19, dated March 08,2019) . P.G. heartily acknowledges the CSIR, Government of India for his fellowship (File no. 09/096 (1019) /2020-EMR-I) . A.H. is thankful to CSIR, India, for awarding a Senior Research Fellowship (Sanction no. 31/0019 (11449) /2021-EMR-I) .J.M. heartily acknowledges the UGC, Government of India, for his RGNF fellowship (Registration ID: RGNF-2017-18-SC-WES-33748) . S.M. heartily acknowledges the CSIR, Government of India, for his fellowship (File no. 09/0096 (11248) /2021-EMR-I) .