Synthesis and characterization of coordination polymers of a carboxylato cyclophane with metal [Zn(II) and Cd(II)]-2,2′-bipyridines |
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Authors: | Niraj Kumari Rishikesh Prajapati Osamu Hayashida Lallan Mishra |
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Affiliation: | 1. Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221005, India;2. Department of Chemistry, Faculty of Science, Fukuoka University, Fukuoka 814-0180, Japan |
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Abstract: | N,N′,N′′,N′′′-Tetrakis(3-carboxy-propionyl)-1,6,20,25-tetraaza-[6.1.6.1] paracyclophane, H4cp has been complexed with metal (Zn(II) and Cd(II)) 2,2′-bipyridyls. The resulting complexes of the composition [{Zn(2,2′-bpy)}2(cp)]n·4H2O 1 and [{Cd(2,2′-bpy)}2(cp)]n·5H2O 2 (2,2′-bpy = 2,2′-bipyridine) have been characterized using spectroscopic (IR, solid state UV–Vis), elemental analysis and single-crystal X-ray diffraction measurements. In these complexes the cyclophane coordinates in different modes, and in complex 2, Cd(II) is hepta-coordinated. However, under harsh reaction conditions (using excess nitric acid and a longer reaction time) debranching of the cyclophane is observed in the reaction of Zn(2,2′-bpy)(NO3)2 with H4cp, and a complex of the composition [Zn(2,2′-bpy)(Suc)]n3 (suc = succinate) is isolated. Using non-covalent interactions, complexes 1 and 2 provide 3D supramolecular structures, whereas an infinite 1D chain structure is observed for complex 3. The thermal and photoluminescence properties of the complexes have also been studied. |
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Keywords: | Cyclophanes 2,2&prime -Bipyridyl Metal-complexes X-ray crystallography Photoluminescence |
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