Coordinating and non-coordinating anion controlled synthesis of different nuclearity cadmium(II) complexes of 2-((E)-((pyridin-2-yl)methylimino)methyl)phenol: Crystal structure and photophysical study

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• 作者：Priyanka Kundu^a ; Ennio Zangrando^b ; ^{ezangrando@units.it" class="auth_mail" title="E-mail the corresponding author} ; Prateeti Chakraborty^a ; ^c ; ^{prateeti_17@yahoo.co.in" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Tetranuclear Cd(II) ; Tridentate Schiff-base ; Structural diversity ; Photoluminescence ; Topology
• 刊名：Polyhedron
• 出版年：2015
• 出版时间：24 November 2015
• 年：2015
• 卷：101
• 期：Complete
• 页码：6-13
• 全文大小：2142 K

文摘

The tridentate Schiff base ligand 2-((E)-((pyridin-2-yl)methylimino)methyl)phenol (HL) was used to synthesize four new cadmium(II) complexes, namely [Cd₄L₆](ClO₄)₂ (1), [CdL(SCN)]_n (2), [CdL(dca)]_n (3) and [CdL(N₃)]_n (4), with the aim of exploring the role of the coordinating and non-coordinating anion in governing the architecture as well as the photophysical behavior of the complexes. In addition to common physicochemical techniques, complexes 1 and 2 have further been characterized by X-ray single crystal structural analysis. Complex 1 is a tetranuclear cationic Cd(II) species where each metal ion has a distorted octahedral geometry. Three Cd atoms have the N₄O₂ chromophoric environment, whereas the fourth and central Cd has an O₆ chromophore. Complex 2 is a polynuclear species having a 2D network of (4,4) topology where dinuclear [Cd₂L₃] metal entities located at the nodes are bridged by SCN⁻ anions. The ligand and all four complexes are highly fluorescent. Quantum yield calculations reveal that the fluorescence efficiency of the complexes is higher than that of the ligand and the efficiency is largely influenced by the nature of the co-ligand.