No abstract

No abstract

A novel multiple target sensor DHIC was developed for the fluorescence detection of Zn2+ and S2− and colorimetric detection of Fe3+/2+. Moreover, DHIC could image sequentially Zn2+ and S2− in living cells.

A novel selective and sensitive chemosensor, (E)-1-((((1H-benzo[d]imidazol-2-yl)methyl)imino)methyl)naphthalen-2-ol (BIN), was developed for fluorescence detection of Zn2+. The compound BIN acts as a fluorescent “turn-on” detector for Zn2+. The limit of detection (2.26 µM) for zinc ion is well below the WHO standard (76.0 µM). Probe BIN can be chemically reversible with ethylenediaminetetraacetic acid (EDTA). The binding mechanism of BIN with zinc ion was demonstrated by fluorescence, UV-visible, electrospray ionization mass spectroscopy, 1H NMR titration and calculations. Importantly, probe BIN could be applied to determine zinc ion in water samples and living zebrafish.

Novel tridentate N2O‐type ligands L1–L4 (((((X‐benzyl)pyridine‐2‐yl)methylamino)methyl)phenol); L1 for X=4‐CH3, L2 for X=H, L3 for X=2‐F, L4 for X=4‐CF3) and their dinuclear copper(II) complexes C1–C4 (C1 for [(L1)2Cu2(NO3)2], C2 for [(L2)2Cu2(NO3)2], C3 for [(L3)2Cu2(NO3)2] and C4 for [(L4)2Cu2(NO3)2]) was synthesized and verified by 1H NMR, IR, and ESI‐Mass. The structural forms of the copper complexes were determined by X‐ray crystallography. The dinuclear copper complexes C1–C4 showed efficient ring‐opening properties of epoxides with methanol under mild conditions. In particular, the copper complex C1 having electron‐donating group in the ligand showed the most efficient reactivity in the ring opening of epoxides. The sole attack at the benzylic carbon of styrene oxide and the less steric preference in 1,2‐epoxyhexane demonstrated that the regiochemistry of the ring opening catalyzed by dinuclear copper complexes might be dependent on the electronic feature of epoxide.

No abstract