Synthesis, Characterization and Photoluminescent Property of a Trinucleated Cadmium (II) Coordination Polymer Involving In Situ Ligand Reaction

Abstract

A novel two-dimensional cadmium complex [Cd3(pzta)2(μ-Cl)4H2O)2]n (1) has been synthesized hydrothermally by the reaction of pyrazine carbonitrile and sodium azide in the presence of cadmium(II) chloride as Lewis acid catalyst. Complex 1 was characterized by elemental analysis, thermal gravimetric analysis, IR spectroscopy and single-crystal X-ray diffraction. Complex 1 crystallizes in triclinic crystal system, having the P $$ \overline{1} $$ space group, which by utilizing hydrogen-bonding extends the molecular complex into 3D hydrogen-bonded metallo-supramolecular networks. It has been shown that N–H–O hydrogen bond based on $$ R_{2}^{2} $$ (26) and $$ R_{2}^{2} $$ (12) supramolecular synthons can be relied upon as effective tools for the assembly and organization of hexa-coordinated complex. Furthermore, compound 1 shows strong photoluminescence properties at room temperature in solid state. The complex Cd3(pzta)2(μ-Cl)4H2O)2]n (1) has been made hydrothermally by the reaction of CdCl2∙H2O, pyrazinecarbonitrile, NaN3, H3PO4 and water at 130 °C in 36 h. In the polymeric structure of 1, hydrogen bonds working in cooperativity with covalent interactions are capable of ‘maneuvering’ complex ions into desirable motifs.