Papers - Yoshioka, Naoki

Complexation Constants of Lanthanide Ions with Poly (Methacrylic Acid) and Its Copolymers

NISHIDE HIROYUKI, IZUSHI TADAHIKO, ARAI AKEMI,TSUCHIDA EISHUN

Journal of Macromolecular Science-Chemistry (Taylor & Francis)  24 ( 3-4 ) 343 - 351 1987.03

Research paper (scientific journal), Joint Work, Accepted

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Complexation of some lanthanide ions with poly(methacry1ic acid) and its copolymers was studied by potentiometric titration. Poly [methacrylic acid-co-oligo(ethy1ene oxide)rnethacrylate] and poly(methacrylic acid-co-acrylamide) formed tris-carboxylate coordinate lanthanide complexes with large overall complexation constants, while poly(methacrylic acid)s and copolymer with higher content of the methacrylic acid residue formed bis-coordinate ones. It was concluded that the comonomer residues in the copolymer chains decreased the steric hindrance for the complexation and/or acted as co-coordinating groups of the carboxylic group to lanthanide ions. Very large positive and favorable entropy changes were observed for the complexation with poly(methacry1ic acid) and its copolymers. This contribution of thermodynamic parameters to the complexation was contrary to that for the analogous monomeric methacrylic acid complex and is assumed to be induced by dehydration of the polymers through the lanthanide ion complexation.

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Complexation of Europium Ion with Poly(Methacrylic Acid)s and Fluorescent Property of the Complexes

NISHIDE HIROYUKI, IZUSHI TADAHIKO, YOSHIOKA NAOKI, TSUCHIDA EISHUN

Polymer Bulletin (Springer)  14 ( 5 ) 387 - 392 1985.11

Research paper (scientific journal), Joint Work, Accepted

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The complexation of europium ion(Eu3+) with poly(methacrylic acid) and its copolymers was studied. Poly(methacrylic acid-co-acrylamide) formed the tris(carboxylate)-coordinate Eu complex with extra large overall complexation constant while poly(methacrylic acid)s did the bis-coordinate ones. Transparent and flexible film containing much Eu ion was prepared by casting the complex solution of poly(methacrylic acid-co-methylacrylate). On exposure to ultraviolet light (393 nm), the film relatively strongly fluorescenced a red color based on the tris-coordinate and uniformly dispersed Eu complex.

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ポリメタクリル酸－ガドリニウム錯体の合成と性質

吉岡直樹、出石忠彦、西出宏之、篠原　功、土田英俊、渡辺　強、近　桂一郎

高分子論文集 42 ( 5 ) 301 - 304 1985.05

Research paper (scientific journal), Joint Work, Accepted

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メタクリル酸-メチルアクリラート共重合体 (モル組成比約1: 3) とガドリニウムの錯体は, 溶媒キャスト法によりGd3+含量が多く, かつ柔軟で透明な膜を与えた. 錯形成したGd3+は常磁性 (室温, 2.7×10-2emu mol-1) で, 膜中に均一に分散していることを確認した。

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