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Syntheses and Structural Analyses of New 3D Isostructural Zn(II) and Cd(II) Luminescent MOFs and their Application Towards Detection of Nitroaromatics in Aqueous Media
Author(s) -
Parmar Bhavesh,
Rachuri Yadagiri,
Bisht Kamal Kumar,
Suresh Eringathodi
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201601134
Subject(s) - isostructural , luminescence , aqueous solution , chemistry , detection limit , metal organic framework , quenching (fluorescence) , nitro , benzene , crystal structure , fluorescence , materials science , crystallography , organic chemistry , chromatography , physics , alkyl , optoelectronics , adsorption , quantum mechanics
Two new isostructural luminescent metal‐organic frameworks (LMOFs); {[M( BDC )( L )].xG} n , comprising Zn 2+ ( 1 ) or Cd 2+ ( 2 ) nodes, 4‐pyridyl carboxaldehyde isonicotinoylhydrazone ( L ), Benzene‐1,4‐dicarboxylic acid (H 2 BDC ) and lattice guests (G) have been synthesized by diffusion, conventional and mechanochemical routes and thoroughly characterized. Single crystal structural analysis revealed doubly interpenetrating double pillared primitive cubic unit ( pcu ) structures with significant stability at ambient conditions and in water for 1 and 2 . Moreover, both structures showed good luminescent properties which are exploited for detection of nitro analytes. Fluorescence quenching experiments performed for a large pool of aromatic and aliphatic nitroanalytes showed that 1 and 2 selectively detect Trinitrophenol (TNP) in aqueous phase. The linear fitting of the SV plots for TNP offered quenching constants of 1.16 × 10 4 M −1 and 1.35 × 10 4 M −1 for 1 and 2 respectively indicating the high sensitivity of the sensing process. Remarkable sensitivity of synthesized materials towards aqueous phase TNP detection were further endorsed by the detection limits of 82 ppb (0.36 μM) and 33 ppb (0.15 μM) in case of 1 and 2 respectively. Thus, these new LMOFs owing to their high water stability and remarkable functional features are potential candidates which can be developed into selective and sensitive TNP detection devices.