A novel mixed ligand one-dimensional coordination polymer (1D CP), {[Cd2(adc)2(4-nvp)6]·(MeOH)·(H2O)} n (1; H2adc = 9,10-anthracenedicarboxylic acid, and 4-nvp = 4-(1-naphthylvinyl)­pyridine), has been synthesized and structurally characterized by single crystal X-ray crystallography. The 1D polymer undergoes supramolecular aggregation via hydrogen bonding, C–H···π, and π···π interactions. Interestingly, compound 1 shows increasing conductivity upon irradiation of light. Therefore, it has the potential to be used in optoelectronic devices. Moreover, the supramolecular assembly of 1 specifically detects Cr3+ cation in the presence of other competitive analytes. Most importantly, compound 1 exhibits fascinating turn-on Cr3+ sensing, which seems to be an ornament in the field of sensing application.

Drinking water quality management and sustainable environment to water bodies are a major concern to public health engineering departments. Inorganic phosphate (Pi), one of the major inorganic pollutants, is addressed for the last two decades regarding trace quantity detection. Over the past few years, a large number of fluorescent metal−organic frameworks (F-MOFs) have been studied to explore the desirable method for selective water analysis. In this article, a Zn− anion by a "turn-off" fluorescent sensing technique. Single-crystal X-ray analysis accounts that the asymmetric unit is constituted of two different Zn(II) centers by PCDF-INH, and the bridging group BDC 2− ions are responsible for the generation of the helical polymer and the biporous structures (14.807 × 13.096 Å 2 and 24.905 × 24.932 Å 2 ). The compound, 1, exhibits strong emission at 505 nm in CH 3 OH−H 2 O solution and is "turn-off" upon the addition of H 2 PO 4 − . The selectivity and specificity for H 2 PO 4 − have been checked in the presence of 15 different anions, including different phosphates (PO 4 3− , HPO 4 2− , P 2 O7 4 − ). The entire sensing activity of 1 is examined by spectrofluorometric method, 1 H NMR titration, PXRD analysis, and bioimaging study, and the limit of detection is 3.903 μM. However, in vitro biosensing analysis confers that F-MOF (1) is sensable toward the H 2 PO 4 − ion at a trace level in the human lung fibroblast cells and human liver cancer cell line Hep G2.

A new rhodamine based allyl-ether Schiff base (RD) was spectroscopically characterized and used as a colorimetric and fluorimetric sensor. RD acts as turn-on highly selective fluorescent chemosensor for Pd(ii) from only a mixture of Pd(0) and Pd(ii) in the presence of 25 other cations in aqueous-acetonitrile medium. The mechanism for Pd(ii) sensing with RD involves Pd(ii)-triggered terminal (C-O)-allyl bond cleavage followed by opening of the spirolactam ring. Pd(ii) is allylphilic and the (rhodamine)O-allyl moiety selects Pd(ii) from the mixture (Pd(0) + Pd(ii)), and a fluorescence enhancement is observed. The proposal has been supported by spectroscopic data (FTIR, H NMR,C NMR, and mass spectroscopy). It is again supported by examining the Pd(ii) selectivity of an non-allylated rhodamine appended iminephenol (RD'), which failed to selectively detect Pd(ii). Hence, the presence of the allylether is mandatory in the fluorogenic motif for Pd(ii) selectivity. The limit of detection (LOD) of Pd(ii) by RD is 50 nM at pH 7.4. Fluorescence microscopic studies help in imaging the cellular uptake of Pd at the nM level in the HCT116 (Human colorectal carcinoma) cell line.

Thioether Schiff base (H2L), a nontoxic Zn2+-sensor (LOD, 0.050 μM) has shown selective ON–OFF emission following INHIBIT logic circuit with H2PO4−and useful agent for the identification of Zn2+and H2PO4−in intracellular fluid in living cells.

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An allyloxynitrophenylimio-propylhydroxyl appended rhodamine (RD-3) specifically recognises Cr in aqueous buffer medium at pH 7.4. The visible light excitable reagent (λ 505 nm) on selective binding to Cr exhibited a strong fluorescence turn-on response with powerful emission at 557 nm and the tail of this luminescence band is extended to ∼650 nm. Interference studies confirm that other metal ions (27 ions) do not hamper the detection process of Cr. The sensing mechanism is studied by absorption, fluorescence, Job's plot, and H NMR titration studies. The detection limit is as low as 33 nM. The practical applicability of RD-3 is examined for imaging Cr(iii) ions in HCT116 (human colorectal carcinoma) cells.

Vanillinyl Schiff base (H 2 L), a nontoxic probe and a fluorescent sensor to Zn 2+ , LOD 0.018 µM is used for living cell imaging.