3D Rare earth porous coordination frameworks with formamide generated in situ syntheses: Crystal structure and down- and up-conversion luminescence

• DOI: 10.1016/j.jssc.2013.02.015
• Publication Date: 2013-02-27T01:05:40Z
• Authors: Xue Ma; Jing Tian; Hong-Y. Yang; Kai Zhao; Xia Li
• Keywords: 01 natural sciences; 0104 chemical sciences

The reaction of RE(NO) 3 ·6H 2 O and formamide yielded the coordination polymers, [ RE (HCOO) 4 ] − [NH 2 CHNH 2 ] + ( RE =Y 1 , Eu 2 , Gd 3, Tb 4, Dy 5 , Er 6 , and Yb 7 ). They possess 3D porous frameworks with the 1D rhombic channels occupied by [NH 2 CHNH 2 ] + cations. Complexes 2 and 4 display the characteristic down-conversion emissions corresponding to 5 D 0 → 7 F J ( J =1–4) transitions of Eu(III) ion and 5 D 4 → 7 F J ( J =6−3) transitions of Tb(III) ion, respectively. Longer lifetime values of 2.128±0.002 ms ( 5 D 0 ) for 2 and 2.132±0.002 ms ( 5 D 4 ) for 4 have been observed. The up-conversion spectra of the Y:Yb,Er and Gd:Yb,Er codoped complexes exhibit three emission bands around 410 ( 4 H 9/2 → 4 I 15/2 , blue), 518–570 ( 4 S 3/2 , 2 H 11/2 → 4 I 15/2 , green), and 655 nm ( 4 F 9/2 → 4 I 15/2 , red).