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Microstructural Modulation of Isomorphic Luminescent Coordination Polymers To Achieve Sensing Effect Transformation
Jinfang Zhang1, Xingyu Tao1, Shuaixing Wang1
1International Joint Research Center for Photoresponsive Molecules and Materials, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, P. R. China.
Abstract:
The sensing effect transformation is first exploited by microstructural modulation. Two AIE functional ligands L-1 and L-2 were developed to construct two isomorphic coordination polymers [Cu(L-1)2(SCN)2] (1) and [Cu(L-2)2(SCN)2] (2), respectively (L-1 = 4,4'-((9H-fluoren-9-ylidene)-methylene)dipyridine; L-2 = 5,5'-((9H-fluoren-9-ylidene)-methylene)dipyrimidine). 1 and 2 exhibit 1-D single-chain architectures and have good water, pH, and thermal stabilities. 1 and 2 show the functional-ligand-originated luminescence and reduced emission intensities. L-1 and L-2 stack in a back-to-back manner in 1 and 2 with the distances of 4.61 and 5.38 Å, resulting in distinct MnO4- sensing effects for 1 and 2. 1 exhibits "turn-off" (luminescence quenching) MnO4- sensing. In a sharp contrast, 2 shows "turn-on" (luminescence enhancing) MnO4- sensing ability with ultrahigh sensitivity. Particularly, 2 represents the first "turn-on" MnO4- sensor. Their sensing mechanism toward a distinct MnO4- sensing effect is discussed in detail.
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