title: Sequential metal ion assembly in cyclic phenylazomethine.
abstract: [reaction: see text] Cyclic phenylazomethines with methylene spacers (CPA-M) are obtained by dehydration of diamine with diketone. During the titration of CPA-M 4mer with FeCl(3), we observe two consecutive isosbestic points in the UV-vis spectra. We conclude that complexation occurs in two consecutive steps. Our analysis suggests that the stepwise metal ion assembly is caused by a difference in the basicity of the imine conformers. Metal ion binding first occurs at the Z imines followed by coordination to the E imine. Finally, metal ion assembly in this compound can be controlled electrochemically.
authors.affiliation: National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan. higuchi.masayoshi@nims.go.jp
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Higuchi
authors.forename: Ryo
authors.initials: R
authors.lastname: Shomura
authors.forename: Yuhki
authors.initials: Y
authors.lastname: Ohtsuka
authors.forename: Akari
authors.initials: A
authors.lastname: Hayashi
authors.forename: Kimihisa
authors.initials: K
authors.lastname: Yamamoto
authors.forename: Dirk G
authors.initials: DG
authors.lastname: Kurth