Synthesis, characterization, and fluorescent properties of two Pb(II) complexes: {[Pb(hca)2·DMF]·DMF}∞ and [Pb(hca)2(phen)·DMF]2 |
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| Authors: | Xu Qing-Feng Lu Jian-Mei Xia Xue-Wei |
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| Affiliation: | a Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry and Chemical Engineering, Suzhou University, Hengyi Road. Suzhou Jiangsu 215123, China
b Jiangsu Polytechnic University, Changzhou Jiangsu 213016, China |
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| Abstract: | Two novel Pb(II) complexes, {[Pb(hca)2·DMF]·DMF}∞ and [Pb(hca)2(phen)·DMF]2 (hca=trans-4-hydroxycinnamic group), were obtained by solid-phase reactions of PbAc2 and Hhca and PbAc2, Hhca, and phen, respectively, and characterized by spectroscopy. X-ray crystallography analysis reveals that complex 1, {[Pb(hca)2·DMF]·DMF}∞, adopts a 2-dimensional structure through the weak interactions of Pb and O atoms and that complex 2, [Pb(hca)2(phen)·DMF]2, shows a discrete dimeric structure, in which hydrogen bonds link the dimers into a 2D network. Both complexes 1 and 2 show visible fluorescence and the intensity is stronger than that of the ligand. More interestingly, the intensity of emission was increased at least fivefolds when the pH of the solution was adjusted to alkalinity. This can be attributed to that the deprotonization of phenolic group enhancing the conjugation of the ligand hca. These results indicate that this method may be an effective way to increase the emission intensity of similar complexes. |
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| Keywords: | Lead(II) complex Trans-4-Hydroxycinnamic acid Crystal structure Fluorescence |
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