Crystal Structure and Luminescence Spectra of Novel Coordination Layer of {[Eu(m-BDC)(NO3)(Phen)(H2O)]2·2CH3CH2OH}n
来源期刊：JOURNAL OF RARE EARTHS2005年第2期
论文作者：Xia Jiangbin Lu Shaozhe Wang Mingzhao Cai Guanliang
Key words：europium; m-benzenedicarboxylate; coordination layer; crystal structure; luminescence; rare earths;
Abstract: The crystal structure of a novel Eu3+ coordination polymer, {[Eu(m-BDC)(NO3)(Phen)(H2O)]2 · 2CH3CH2OH}n (m-BDC=1,3-benzenedicarboxylate, Phen=1, 10-phenanthroline), was obtained and its high-resolution luminescence spectra at 77K were measured. The μ2-carboxylate of m-BDC constructs the binuclear building block in which each Eu3+ ion is coordinated by four oxygen atoms of m-BDC anions, one oxygen atom from water molecule, two oxygen atoms of nitrate and two nitrogen atoms of Phen, respectively. The μ1-carboxylate of m-BDC conjugates the binuclear units one-dimensional chain or a ribbon, while the hydrogen bonds between ribbons assemble the structure two-dimensional layer with a thickness equaling to the width of the ribbon. The luminescence spectra reveal that the two Eu3+ ion sites in the binuclear building blocks have slight environmental difference. The C1 local symmetry of Eu3+ ion is concluded from both crystal structure measurement and luminescence spectra.
Xia Jiangbin1，Lu Shaozhe2，Wang Mingzhao1，Cai Guanliang3
(1.Department of Chemistry, Beijing Normal University, Beijing 100875, China;
2.Laboratory of Excited State Processes, Chinese Academy of Science, Changchun 130021, China;
3.Chemical Defense Institute, PLA, Beijing 102205, China)
Abstract:The crystal structure of a novel Eu3+ coordination polymer, {[Eu(m-BDC)(NO3)(Phen)(H2O)]2 · 2CH3CH2OH}n (m-BDC=1,3-benzenedicarboxylate, Phen=1, 10-phenanthroline), was obtained and its high-resolution luminescence spectra at 77K were measured. The μ2-carboxylate of m-BDC constructs the binuclear building block in which each Eu3+ ion is coordinated by four oxygen atoms of m-BDC anions, one oxygen atom from water molecule, two oxygen atoms of nitrate and two nitrogen atoms of Phen, respectively. The μ1-carboxylate of m-BDC conjugates the binuclear units one-dimensional chain or a ribbon, while the hydrogen bonds between ribbons assemble the structure two-dimensional layer with a thickness equaling to the width of the ribbon. The luminescence spectra reveal that the two Eu3+ ion sites in the binuclear building blocks have slight environmental difference. The C1 local symmetry of Eu3+ ion is concluded from both crystal structure measurement and luminescence spectra.
Key words:europium; m-benzenedicarboxylate; coordination layer; crystal structure; luminescence; rare earths;
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