Influence of Photoinduced Electron Transfer on Lanthanide-Based Coordination Polymer Luminescence: A Comparison between Two Pseudoisoreticular Molecular Networks
journal contributionposted on 21.01.2014 by Stéphane Freslon, Yun Luo, Guillaume Calvez, Carole Daiguebonne, Olivier Guillou, Kevin Bernot, Vincent Michel, Xiao Fan
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The luminescent properties of two families of heteronuclear lanthanide-containing coordination polymers are compared. These families have general chemical formulas [Ln2–2xLn′2x(ip)3(H2O)9·6H2O]∞ and [Ln2–2xLn′2x(aip)2(H2O)10·(aip)·4H2O]∞ where H2ip and H2aip stand for isophthalic acid and 5-amino-isophthalic acid, respectively, and where Ln and Ln′ are one of the lanthanide ions between Sm3+ and Dy3+. Heteronuclear compounds that belong to each family are isostructural to the already reported homonuclear compounds [Gd2(ip)3(H2O)9·6H2O]∞ and [Eu2(aip)2(H2O)10·(aip)·4H2O]∞, respectively. These two crystal structures are very similar. However, despite similar chemical formulas, similar crystal structures, and similar hydration rates, these two families of compounds present very different luminescent properties that have thus been deeply investigated. This study demonstrates that these different optical behaviors can be attributed to the presence of a PET (photoinduced electron transfer) mechanism that is only present in the amino-isophthalate-containing coordination polymers.