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Design, Synthesis, and Characterizations of a Series of Pt-4 Macrocycle and Fluorescent Sensing of Fe3+/Cu2+/Ni2+ Through Metal Coordination

Ghosh, Sushobhan and Chakrabarty, Rajesh and Mukherjee, Partha Sarathi (2009) Design, Synthesis, and Characterizations of a Series of Pt-4 Macrocycle and Fluorescent Sensing of Fe3+/Cu2+/Ni2+ Through Metal Coordination. In: Inorganic Chemistry, 48 (2). pp. 549-556.

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Abstract

A PtII 2 organometallic “clip” (1a) containing ethynyl functionality is synthesized. Multinuclear NMR and electrospray ionization mass spectrometry characterized this “clip”, and the molecular structure was determined in an X-ray single-crystal diffraction study. A series of discrete molecular rectangles (2a-d) have been synthesized from this “clip” in combination with dipyridyl-based linear linkers (L1-4) by a metal-ligand coordination driven self-assembly approach [where L1 ) 4,4′-bipyridine, L2 ) trans-1,2-bis(4-pyridyl)ethylene, L3 ) N-(4-pyridyl)isonicotinamide,and L4 ) N,N′-bis(4-pyridylidene)ethylenediamine]. Rectangle 2d was designed using the imine-based ligand L4 to make it a system composed of a fluorophore-receptor-fluorophore combination. The imine N4 pocket is the receptor site, while the anthracene-based “clip” is the fluorophore. Complex 2d is fluorescent in nature and showed fluorescence quenching in solution upon the binding of hard transition metal ions (Fe3+, Cu2+, Ni2+, and Mn2+) into the N4 pocket. The nonresponsive nature of the fluorescence intensity upon the addition of soft metal ions (Zn2+ and Cd2+) having d10 configuration makes it a suitable sensor for transition metal ions. The fluorescence intensity of the Ni2+ bound complex was regained when the metal was removed by a stronger chelating 2,2′-dipyridyl ligand.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Depositing User: Mr. Ramesh Chander
Date Deposited: 06 Nov 2009 04:16
Last Modified: 19 Sep 2010 05:24
URI: http://eprints.iisc.ac.in/id/eprint/18604

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