Ligand-dependent assembly of dinuclear, linear tetranuclear and one-dimensional Zn(ii) complexes with an aroylhydrazone Schiff base

Three complexes, [Zn(H₂L¹)(CH₃COO)]₂·CH₃OH (1), [Zn₄(H₂L²)₂(CH₃COO)₄]·4DMF (2) and {[Zn₄(L³)₂(CH₃COO)₄]·DMSO}_n (3) (H₃L¹ = 4-hydroxybenzoic acid (2-hydroxy-5-nitro-benzylidene)-hydrazide, H₄L² = 4-hydroxy-3-methoxybenzoic acid (2,3-dihydroxy-benzylidene)-hydrazide, H₂L³ = (4-nitro-phenoxy)acetic acid (2-hydroxy-3-methoxy-benzylidene)-hydrazide)), have been synthesized and studied, in which three kinds of ligands have been designed by introducing diversified bridging-functional groups. The single-crystal X-ray diffraction analysis showed that 1-3 are dinuclear, linear tetranuclear and 1D chain coordination complexes, respectively, which were achieved by controlled synthesis of multinuclear complexes through ligand design. The luminescence properties of these crystallized complexes have been investigated both in solution and the solid state.