Metallo supramolecular assemblies of bis-squaraines by allosteric Ca2+ ion binding.
Alkyl chain tethered bis-squaraines bind to Ca2+ ions through the participation of the negatively charged oxygen of the central cyclobutene moiety to form folded H-type aggregates. The initially formed Ca2+ complex is preorganized to facilitate cooperative allosteric binding of Ca2+, resulting in the formation of extended supramolecular arrays. The electronic absorption, IR, and ESI-MS studies support the formation of metallo supramolecular architectures of the folded H-type dimers of the bis-squaraines.
Yagi
Shigeyuki
S
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai, Osaka, Japan. yagi@chem.osakafu-u.ac.jp
Hyodo
Yutaka
Y
Hirose
Masahiko
M
Nakazumi
Hiroyuki
H
Sakurai
Yoshiaki
Y
Ajayaghosh
Ayyappanpillai
A