Tetracarboxylato-bridged copper(II) complexes with ancillary N-chelating ligands: Syntheses, crystal structures and effect of aromatic compounds on the fluorescence property

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• 作者：Soumen Mistri^a ; Ennio Zangrando^b ; Subal Chandra Manna^a ; ^{scmanna@mail.vidyasagar.ac.in}
• 关键词：Copper(II) ; Tetracarboxylate ; Bidentate N ; N-chelating ligands ; Crystal structure ; Fluorescence sensor
• 刊名：Polyhedron
• 出版年：2013
• 出版时间：25 January, 2013
• 年：2013
• 卷：49
• 期：1
• 页码：252-258
• 全文大小：1185 K

文摘

Two Cu(II) complexes [Cu₂(1,10-phen)₂(H₂O)₄(cbtc)]¡¤6H₂O (class=""boldFont"">1) and {[Cu₂(2,2¡ä-bipy)₂(cbtc)]¡¤6H₂O}_n (class=""boldFont"">2) [1,10-phen = 1,10-phenanthroline; 2,2¡ä-bipy = 2,2¡ä-bipyridine; cbtc = 1,2,3,4-cyclobutane tetracarboxylate tetraanion], were synthesized and characterized by elemental analysis, IR, single crystal X-ray crystallography and thermal analysis. The structural determination reveals that complex class=""boldFont"">1 is dinuclear, while class=""boldFont"">2 is a 1D polymeric chain built by a bridging cbtc ligand. Hydrogen bonding interactions, formed by coordinated and/or lattice water molecules with cbtc oxygens, lead to a supramolecular architecture in both structures. Complex class=""boldFont"">1, which exhibits intense fluorescence (¦Ë_ex = 262 nm, ¦Ë_em = 358 and 373 nm) at room temperature, was tested with several aromatic compounds, such as m-toluidine, aniline, nitrobenzene, etc. in MeOH-CHCl₃ (1:1) solution. The results show that a pronounced fluorescence quenching and enhancement is observed in the presence of nitrobenzene and m-toluidine, respectively. Thermogravimetric analysis shows that complex class=""boldFont"">2 undergoes a reversible deaquation-rehydration process.