1421969-89-2Relevant academic research and scientific papers
Coordination self-assembly of tetranuclear Pt(ii) macrocycles with an organometallic backbone for sensing of acyclic dicarboxylic acids
Shanmugaraju, Sankarasekaran,Bar, Arun Kumar,Jadhav, Harshal,Moon, Dohyun,Mukherjee, Partha Sarathi
, p. 2998 - 3008 (2013)
Coordination self-assembly of a series of tetranuclear Pt(ii) macrocycles containing an organometallic backbone incorporating ethynyl functionality is presented. The 1:1 combination of a linear acceptor 1,4-bis[trans-Pt(PEt 3)2(NO3)(ethynyl)]benzene (1) with three different dipyridyl donor 'clips' (La-Lc) afforded three [2 + 2] self-assembled PtII4 macrocycles (2a-2c) in quantitative yields, respectively [La = 1,3-bis(3-pyridyl) isothalamide; Lb = 1,3-bis(3-pyridyl)ethynylbenzene; Lc = 1,8-bis(4-pyridyl)ethynylanthracene]. These macrocycles were characterized by multinuclear NMR (1H and 31P); ESI-MS spectroscopy and the molecular structures of 2a and 2b were established by single crystal X-ray diffraction analysis. These macrocycles (2a-2c) are fluorescent in nature. The amide functionalized macrocycle 2a is used as a receptor to check the binding affinity of aliphatic acyclic dicarboxylic acids. Such binding affinity is examined using fluorescence and UV-Vis spectroscopic methods. A solution state fluorescence study showed that macrocycle 2a selectively binds (KSV = 1.4 × 104 M-1) maleic acid by subsequent enhancement in emission intensity. Other aliphatic dicarboxylic acids such as fumaric, succinic, adipic, mesaconic and itaconic acids caused no change in the emission spectra; thereby demonstrating its potential use as a macrocyclic receptor in distinction of maleic acid from other aliphatic dicarboxylic acids.
