title: Fluorescence and energy transfer properties of heterometallic lanthanide-titanium oxo clusters coordinated with anthracenecarboxylate ligands.
abstract: Two 9-anthracenecarboxylate (9-AC) coordinated heterometallic TOC compounds, [Ln2Ti10O14(ClO4)2(O(i)Pr)14(9-AC)2(CH3CN)2]·2H2O, Ln = Nd 1() and Eu (2), along with two benzoate (bza) analogues, [Ln2Ti10O14(ClO4)2(O(i)Pr)14(bza)2(HO(i)Pr)2], Ln = Nd (3) and Eu (4), were prepared by one step in situ solvothermal synthesis, and characterized by single crystal analysis. To date, only about ten lanthanum-titanium oxo clusters have been reported. Except for two Ti28 clusters, the compounds are all small clusters (Ti ≤ 4). The cluster structures of 1-4 adopt a Ti10Ln2 core structure with pseudo-Ci symmetry, which is similar to the fundamental structure of Ti12 clusters. Furthermore, except for their structures, the properties of lanthanum-titanium oxo clusters have never been studied. Herein, the fluorescence properties of these compounds are studied in detail. The metal centered emission of Eu(III) is completely quenched by 9-AC due to the lower triplet energy of the coordinated ligand. Enhanced ligand centered fluorescence is found for 2 in comparison with that of 1.
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China. daijie@suda.edu.cn zhuqinyu@suda.edu.cn.
authors.forename: Sheng
authors.initials: S
authors.lastname: Wang
authors.forename: Hu-Chao
authors.initials: HC
authors.lastname: Su
authors.forename: Lan
authors.initials: L
authors.lastname: Yu
authors.forename: Xiao-Wei
authors.initials: XW
authors.lastname: Zhao
authors.forename: Li-Wen
authors.initials: LW
authors.lastname: Qian
authors.forename: Qin-Yu
authors.initials: QY
authors.lastname: Zhu
authors.forename: Jie
authors.initials: J
authors.lastname: Dai