title: Lanthanide radii controlled one-dimensional polymer and dinuclear complexes and their fluorescent properties.
abstract: A bi-phosphonate ligand tetraethyl-(2,3,5,6-tetramethyl-1,4-phenylene) bis(methylene)diphosphonate has been designed and synthesized. The bi-phosphonate as a bridging ligand reacts with lanthanide nitrates forming four different types of 1D coordination complexes: ribbon polymer (type I), semi-ribbon polymer (type II), zigzag polymer (type III), and dinuclear-triligand short chain (type IV), which changed according to the decrease of the radius of the lanthanide. They have been characterized by IR spectroscopy, elemental analysis, and X-ray diffraction spectroscopy. The photophysical properties of Sm(3+), Eu(3+), Tb(3+) and Dy(3+) complexes at room temperature were also investigated. They exhibit strong fluorescence by excitation of the Ln(3+) ion absorption bands and the quantum yield values of Eu(3+) and Tb(3+) complexes are no less than 20%.
authors.affiliation: Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province and State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China.
authors.forename: Xiong
authors.initials: X
authors.lastname: Hu
authors.forename: Wei
authors.initials: W
authors.lastname: Dou
authors.forename: Chan
authors.initials: C
authors.lastname: Xu
authors.forename: Xiaoliang
authors.initials: X
authors.lastname: Tang
authors.forename: Jiangrong
authors.initials: J
authors.lastname: Zheng
authors.forename: Weisheng
authors.initials: W
authors.lastname: Liu
mesh_terms: D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D018360:Crystallography, X-Ray; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D008968:Molecular Conformation; D011108:Polymers / Q000737:chemistry*; D011789:Quantum Theory; D013050:Spectrometry, Fluorescence
chemical_list: D056831:Coordination Complexes; D028581:Lanthanoid Series Elements; D011108:Polymers