Complexes of Some Pyrido[1,2-a]pyrimidinium Perchlorates with Scandium, Yttrium, and Lanthanum. Crystal and Molecular Structure of 3-Chloro-9-Hydroxy-2,4-Dimethylpyrido[1,2-a]pyrim

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• 作者：Koval&apos ; chukova ; O. V. ; Kuz&apos ; mina ; N. E. ; Strashnova ; S. B. ; Palkina ; K. K. ; Mordovina ; N. I. ; Zaitsev ; B. E. ; Nikitin ; S. V.
• 刊名：Russian Journal of Coordination Chemistry
• 出版年：2003
• 出版时间：2003
• 年：2003
• 卷：29
• 期：2
• 页码：123-128
• 全文大小：106 KB

文摘

Complexes of scandium, yttrium, and lanthanum nitrates with 3-chloro-9-hydroxy-2,4-dimethylpyrido[1,2-a]pyrimidinium perchlorate (HL¹ClO₄) and 9-hydroxy-2,4-dimethylpyrido[1,2-a]pyrimidinium perchlorate (HL²ClO₄) were obtained. Their composition was formulated as Sc(LClO₄)₂(NO₃) and M(LClO₄)₂(NO₃)₂ (L = L¹ or L²; M = Y or La); structures for the complexes obtained were proposed. The crystal and molecular structure of HL¹ClO₄ was determined. Dissociation and complexation of HL¹ClO₄ and HL²ClO₄ in aqueous ethanol were studied using the spectroscopic method. Ligand dissociation and complexation constants were calculated. It was shown that a chlorine-containing organic ligand only slightly changes the composition and stability of the metal complexes.