Sequential metal ion assembly in cyclic phenylazomethine.
[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.
Higuchi
Masayoshi
M
National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan. higuchi.masayoshi@nims.go.jp
Shomura
Ryo
R
Ohtsuka
Yuhki
Y
Hayashi
Akari
A
Yamamoto
Kimihisa
K
Kurth
Dirk G
DG