Synthesis, crystal structure, magnetic and luminescence properties of KEuGe2O6:: a europium cyclogermanate containing infinite chains of edge-sharing Eu-O polyhedra

被引：30

作者：

Chen, Pei-Lin ^{[1
]}

Chiang, Pei-Yun ^{[1
]}

Yeh, Han-Ching ^{[1
]}

Chang, Bor-Chen ^{[1
]}

Lii, Kwang-Hwa ^{[1
,2
]}

机构：

[1] Natl Cent Univ, Dept Chem, Chungli 320, Taiwan

[2] Acad Sinica, Inst Chem, Taipei 115, Taiwan

来源：

DALTON TRANSACTIONS | 2008年 / 13卷 / 13期

关键词：

D O I：

10.1039/b716654k

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A new Eu(III) germanate, KEuGe2O6, has been synthesized by both the flux-growth method and the high-temperature, high-pressure hydrothermal method and characterized by single-crystal X-ray diffraction. The compound contains parallel zigzag chains of edge-sharing Eu-O polyhedra, which are in turn linked by sharing vertices and edges with three-membered single ring Ge3O96- germanate anions to form a 3-D framework structure. The magnetic and luminescence properties were also investigated. The observed chi(M) T value at 300 K is 4.53 emu K mol(-1), which is in good agreement with the calculated value for three EU3+ ions. The sharp peaks in the room-temperature emission spectrum are assigned. The number of lines in the region of the D-5(0)-> F-7(0) transition and the relative intensities of the D-5(0)-> F-7(1) and D-5(0)-> F-7(2) transitions confirm the presence of two local Eu3+ environments and strongly distorted Eu3+-ligand surroundings. The reasons for the very short emission life time is discussed. The Sm and Tb analogues have also been synthesized.

引用

页码：1721 / 1726

页数：6

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[1] Photoluminescent layered lanthanide silicates [J].