Two new zinc(II) complexes, [{N(CN)2}Zn(L1)Zn{µ-1,5-N(CN)2}]2 (1) and [{µ-1,5-N(CN)2}{N(CN)2}Zn(L2)Zn{µ-1,5-N(CN)2}]n (2) {H2L1= 2,2'-[(2,2-Dimethyl-1,3-propanediyl)bis(nitrilomethylidyne)]bis[6-methoxyphenol] and H2L2= 2,2'-[(2,2-Dimethyl-1,3-propanediyl)bis(nitrilomethylidyne)]bis[6-ethoxyphenol]} have been synthesized and characterized. The structures of both complexes have been confirmed by X-ray crystallography....

Two copper(II) complexes, [CuL1]⋅2H2O (1) and [CuL2]⋅H2O (2) [where H2L1 {= N,N′‐bis(3‐methoxysalicylidene)propane‐1,3‐diamine} and H2L2 {=N,N′‐bis(3‐ethoxysalicylidene)propane‐1,3‐diamine} are potential hexadentate N2O4 donor compartmental Schiff bases], were synthesized and characterized. In each complex, copper(II) was placed in the inner N2O2 environment, with a four‐coordinate distorted square planar environment keeping the outer O4 compartment pendant. Lattice water molecules were hydrogen bonded with the pendant O4 compartments of the Schiff base ligands. Both complexes formed self‐assembled dimers via chelate ring⋅⋅⋅chelate ring and C–H⋅⋅⋅π interactions. A cyclic tetrameric water cluster was stabilized by the oxygen rich region of the Schiff‐base ligand in complex 1. A similar type of cyclic cluster involving two water molecules was also observed in complex 2. These supramolecular assemblies were analysed via a DFT study at the M06‐2X/def2‐TZVP level of theory.

A penta-nuclear zinc(ii) complex has been synthesized and characterized. The complex has shown good phosphatase-mimicking activity, which has been evaluated spectrophotometrically. The complex also behaves as a sensor for the detection of nitroaromatics via turn-off fluorescence response.

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