期刊
JOURNAL OF INORGANIC BIOCHEMISTRY
卷 101, 期 5, 页码 774-782出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jinorgbio.2007.01.005
关键词
morin; lanthanides; complexes; thermogravimetric analysis; spectroscopic properties
New solid complex compounds of La(III), Cc(III), Pr(III), Nd(III), Sm(III), Eu(III) and Gd(III) ions with morin were synthesized. The molecular formula of the complexes is Ln(C15H9O7)(3) (.) nH(2)O, where Ln is the cation of lanthanide and n = 6 for La(III), Sm(III), Gd(III) or n = 8 for Ce(III), Pr(III), Nd(III) and Eu(III). Thermogravimetric studies and the values of dehydration enthalpy indicate that water occurring in the compounds is not present in the inner coordination sphere of the complex. The structure of the complexes was determined on the basis of UV-visible, IR, MS, H-1 NMR and C-13 NMR analyses. It was found that in binding the lanthanide ions the following groups of morin take part: 30H and 4CO in the case of complexes of La, Pr, Nd, Sm and Eu, or 5OH and 4CO in the case of complexes of Ce and Gd. The complexes are five- and six-membered chelate compounds. (c) 2007 Published by Elsevier Inc.
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