Auxiliary ligands induced two new Zn(II) compounds with the structural variations from 2D layer to 3D framework: Syntheses, structures and photoluminescent properties

摘要

Two new Zn(II) compounds, [Zn-2(L)(2,2'-bipy)(2)(H2O)(2)](n) (1) and [Zn-2(L)(phen)(2)(H2O)](n) (2) (H4L = 3-(2',4'-dicarboxylphenoxy)phthalic acid, 2,2'-bipy = 2,2'-bipyridine, phen = 1,10-phenanthroline), were successfully obtained via the solvothermal reactions of semi-rigid V-shaped tetracarboxylic acid together with 2,2'-bipy or phen as the auxiliary ligand. These two compounds were structurally characterized by single crystal X-ray diffraction analyses, elemental analyses, powder X-ray diffraction and thermogiavimetric analyses. Compound 1 features a 2D layered structure and these 2D layer motifs further stacked into a 3D supramolecular framework via relatively weak Van der Waals interactions. Compound 2 features a 3D framework with 4-connected mog topology. The structural difference between the two compounds indicates that the N-containing auxiliary ligands play an important role in directing the final frameworks. Moreover, the luminescent properties of these two compounds were also investigated in the solid state at ambient temperature. (C) 2017 Elsevier B.V. All rights reserved.