title: Pb, Sr and Ba calix[6]arene hexacarboxylic acid octahedral complexation: a dramatic effect of dealkylation.
abstract: Calix[6]arene hexacarboxylic acid binds instantly and with low symmetry to Pb, Sr and Ba. Later a highly symmetric up-down alternating conformation emerges. The solution structures are identical to their p-tert-butylcalix[6]arene hexacarboxylic acid counterparts. With either receptor an octahedral cage is formed around the metal. The transformation from low to high symmetry however proceeds at significantly faster rates for the de-t-butylated host.
authors.affiliation: Department of Chemistry and Biochemistry, California State University Long Beach, Long Beach, CA, USA.
authors.forename: Birendra Babu
authors.initials: BB
authors.lastname: Adhikari
authors.affiliation: Department of Chemistry and Biochemistry, California State University Long Beach, Long Beach, CA, USA.
authors.forename: Cuong-Alexander
authors.initials: CA
authors.lastname: To
authors.affiliation: Department of Materials Chemistry, Faculty of Science and Technology, Ryukoku University, Otsu, Shiga 520-2194, Japan.
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Iwasawa
authors.affiliation: Department of Chemistry and Biochemistry, California State University Long Beach, Long Beach, CA, USA.
authors.forename: Michael P
authors.initials: MP
authors.lastname: Schramm