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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 6
BKCSDE 32(6)
June 20, 2011 

 
Title
Microwave-assisted Preparation, Structures, and Photoluminescent Properties of [Ln(NO3)2(H2O)3(L)2](NO3)(H2O) {Ln = Tb, Eu; L = 2-(4-pyridylium)ethanesulfonate, (4-pyH)+-CH2CH2-SO3}
Author
Zhen Nu Zheng, Soon W. Lee *
Keywords
Lanthanide complex, Crystal structure, Microwave heating, Zwitter ion, Emission
Abstract
Two lanthanide complexes, [Ln(NO3)2(H2O)3(L)2](NO3)(H2O) {Ln = Eu (1), Tb (2); L = 2-(4-pyridylium)- ethanesulfonate, (4-pyH)+-CH2CH2-SO3 –)}, were prepared from lanthanide nitrate and 4-pyridineethanesulfonic acid in H2O under microwave-heating conditions. Complexes 1 and 2 are isostructural, and the lanthanide metal in both complexes is coordinated to nine oxygen atoms. The pyridyl nitrogen in the ligand is protonated to give a zwitter ion that possesses an NH+ (pyridyl) positive end and an SO3 – negative end. All O−H and N−H hydrogen atoms participate in hydrogen bonds to generate a two-dimensional (complex 1) or a threedimensional network (complex 2). Complex 1 exhibits an intense red emission, whereas complex 2 exhibits an intense green emission in the solid state at room temperature.
Page
1859 - 1864
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