Abstract
AbstractTwo new isostructural luminescent metal‐organic frameworks (LMOFs); {[M(BDC)(L)].xG}n, comprising Zn2+ (1) or Cd2+ (2) nodes, 4‐pyridyl carboxaldehyde isonicotinoylhydrazone (L), Benzene‐1,4‐dicarboxylic acid (H2BDC) 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 × 104 M−1 and 1.35 × 104 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.
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