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Synthesis, crystal structure and fluorescence properties of terbium complexes with phenoxyacetic acid and 2,4,6‐tris‐(2‐pyridyl)‐ s –triazine
Author(s) -
Wang ZhongXia,
Wang AiLing,
Wei XiaoYan,
Qu YanRong,
Yue Bin,
Kang Jie,
Chu HaiBin,
Zhao YongLiang
Publication year - 2015
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.2829
Subject(s) - chemistry , terbium , denticity , triclinic crystal system , crystal structure , fluorescence , crystallography , metal ions in aqueous solution , chelation , triazine , ion , inorganic chemistry , polymer chemistry , organic chemistry , physics , quantum mechanics
Two complexes of Tb 3+ , Gd 3+ /Tb 3+ and one heteronuclear crystal Gd 3+ /Tb 3+ with phenoxyacetic acid (HPOA) and 2,4,6‐tris‐(2‐pyridyl)‐ s –triazine (TPTZ) have been synthesized. Elemental analysis, rare earth coordination titration, inductively coupled plasma atomic emission spectrometry (ICP‐AES) and thermogravimetric analysis‐differential scanning calorimetry (TG‐DSC) analysis show that the two complexes are Tb 2 (POA) 6 (TPTZ) 2 ·6H 2 O and TbGd(POA) 6 (TPTZ) 2 ·6H 2 O, respectively. The crystal structure of TbGd(POA) 6 (TPTZ) 2 ·2CH 3 OH was determined using single‐crystal X‐ray diffraction. The monocrystal belongs to the triclinic system with the P‐1 space group. In particular, each metal ion is coordinately bonded to three nitrogen atoms of one TPTZ and seven oxygen atoms of three phenoxyacetic ions. Furthermore, there exist two coordinate forms between C 6 H 5 OCH 2 COO – and the metal ions in the crystal. One is a chelating bidentate, the other is chelating and bridge coordinating. Fluorescence determination shows that the two complexes possess strong fluorescence emissions. Furthermore, the fluorescence intensity of the Gd 3+ /Tb 3+ complex is much stronger than that of the undoped complex, which may result from a decrease in the concentration quench of Tb 3+ ions, and intramolecular energy transfer from the ligands coordinated with Gd 3+ ions to Tb 3+ ions. Copyright © 2015 John Wiley & Sons, Ltd.