| Summary: | 碩士 === 東吳大學 === 化學系 === 101 === In this article, four new lead(II)-iridium(III) heterobimetallic coordination frameworks, i.e., [Pb2(L)4(DMF)2]•ClO4•2DMF•13H2O (1•DMF), [Pb4(L)4(DMF)2]•10H2O (1•Acetone), [Pb(L)2(C3H6O)3]•ClO4•4H2O (2•Acetone), and [Pb(L)2(H2O)(C3H6O)2]•C3H6O•3H2O•CH3CN (3•DMF), where L-H2 = Ir(ppy)2(H2dcbpy)PF6, ppy = 2-phenylpyridine, H2dcbpy = 4,4′-dicarboxy-2,2′-bipyridine, have been synthesized and characterized structurally, spectroscopically, elemental analyses, IR spectroscopy, powder and single-crystal X-ray diffraction methods.
The emissions from 1•DMF–3•DMF are ascribed to a metal-to-ligand charge transfer transition (MLCT). The Stern–Volmer quenching constant, KSV values, of 1•DMF–3•DMF can be deduced to be 1.44, 1.60, 2.85 and 5.11 , respectively. The results show promising KSV values that are competitive or even larger than those of many known Ir-complexes. Moreover, the short response time and recovery times toward oxygen have been measured in their single crystal forms. The reversibility experiments for 1•DMF – 3•DMF were carried out for large than ten repeated cycles. It should be noted that iridium(III)-containing coordination polymers with high emission intensity and notable oxygen sensing properties are obscure, especially in the single crystal form. This, in combination with its fine reversibility, leads to success in single crystal oxygen recognition based on photoluminescence imaging. The detection limit could be 0.52%. Moreover, the temperature effect of 3•DMF in a single crystal upon application as an oxygen sensor was expected.
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