title: Mechanochemical and Conventional Synthesis of Zn(II)/Cd(II) Luminescent Coordination Polymers: Dual Sensing Probe for Selective Detection of Chromate Anions and TNP in Aqueous Phase.
abstract: Isostructural Zn(II)/Cd(II) mixed ligand coordination polymers (CPs) {[M(IPA)(L)]}n(CP1 and CP2) built from isophthalic acid (H2IPA) and 3-pyridylcarboxaldehyde nicotinoylhydrazone (L) were prepared using versatile synthetic routes: viz., diffusion of precursor solutions, conventional reflux methods, and green mechanochemical (grinding) reactions. Both robust CPs synthesized by different routes were characterized by various analytical methods, and their thermal and chemical stability as well as the phase purity was established. Crystallographic studies revealed that CP1 and CP2 are isostructural frameworks and feature a double-lined two-dimensional network composed of Zn2+/Cd2+nodes connected through IPA and pillared by the Schiff base ligand L with a double-walled edge. The photoluminescent (PL) properties of CP1 and CP2 have been exploited as dual detection fluorosensors for hexavalent chromate anions (CrO42-/Cr2O72-) and 2,4,6-trinitrophenol (TNP) because it was observed that the emission intensity of aqueous suspensions of CPs selectively quenches by chromate anions or TNP among large pools of different anions or nitro compounds, respectively. Competitive experiments in the presence of interfering anions/other nitro compounds also revealed no major effect in the quenching efficiency, suggesting the selective detection of hexavalent chromate anions as well as TNP by the LCPs. The limits of detection by CP1 for CrO42-/Cr2O72-and TNP are 4 ppm/4 ppm and 28 ppb, respectively, whereas the limits of detection by CP2 for the same analytes are 1 ppm/1 ppm and 14 ppb, respectively. A probable mechanism for the quenching phenomena is also discussed.
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR), CSIR-Central Salt and Marine Chemicals Research Institute , G. B. Marg, Bhavnagar 364 002, Gujarat, India.|Analytical Division and Centralized Instrument Facility, CSIR-Central Salt and Marine Chemicals Research Institute , G. B. Marg, Bhavnagar 364 002, Gujarat, India.
authors.forename: Bhavesh
authors.identifier: http://orcid.org/0000-0003-4263-7635
authors.initials: B
authors.lastname: Parmar
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR), CSIR-Central Salt and Marine Chemicals Research Institute , G. B. Marg, Bhavnagar 364 002, Gujarat, India.|Analytical Division and Centralized Instrument Facility, CSIR-Central Salt and Marine Chemicals Research Institute , G. B. Marg, Bhavnagar 364 002, Gujarat, India.
authors.forename: Yadagiri
authors.identifier: http://orcid.org/0000-0003-2979-2876
authors.initials: Y
authors.lastname: Rachuri
authors.affiliation: Department of Chemistry, RCU Government Post Graduate College , Uttarkashi 249193, Uttarakhand India.
authors.forename: Kamal Kumar
authors.identifier: http://orcid.org/0000-0003-0987-6765
authors.initials: KK
authors.lastname: Bisht
authors.affiliation: Analytical Division and Centralized Instrument Facility, CSIR-Central Salt and Marine Chemicals Research Institute , G. B. Marg, Bhavnagar 364 002, Gujarat, India.
authors.forename: Ridhdhi
authors.identifier: http://orcid.org/0000-0001-9468-6485
authors.initials: R
authors.lastname: Laiya
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR), CSIR-Central Salt and Marine Chemicals Research Institute , G. B. Marg, Bhavnagar 364 002, Gujarat, India.|Analytical Division and Centralized Instrument Facility, CSIR-Central Salt and Marine Chemicals Research Institute , G. B. Marg, Bhavnagar 364 002, Gujarat, India.
authors.forename: Eringathodi
authors.identifier: http://orcid.org/0000-0002-1934-6832
authors.initials: E
authors.lastname: Suresh