title: Concentration- and time-dependent eccentric changes in circular dichroism of saccharide-linked ethynylpyridine oligomer with copper(II) ions.
abstract: We studied the preparation and circular dichroism (CD) behavior of 2,6-pyridylene ethynylene octameric oligomer linked to a β-d-glucoside moiety with a C20-alkylene chain. The addition of Cu(OTf)(2) salt led to a remarkable enhancement of the first CD band of the oligomer, and an unexpected concentration and time dependency were observed. For example, when 1.0 × 10(-3) M of Cu(OTf)(2) was added to a 1,2-dichloroethane solution of the oligomer (5.0 × 10(-4) M, unit concentration), the CD band appeared in the positive at first and gradually inverted into the negative with time.
authors.affiliation: Graduate School of Pharmaceutical Sciences, University of Toyama, Toyama 930-0194, Japan. abeh@pha.u-toyama.ac.jp
authors.forename: Hajime
authors.initials: H
authors.lastname: Abe
authors.forename: Yuki
authors.initials: Y
authors.lastname: Ohishi
authors.forename: Masahiko
authors.initials: M
authors.lastname: Inouye
mesh_terms: D002942:Circular Dichroism; D003300:Copper / Q000737:chemistry*; D005025:Ethylene Dichlorides / Q000737:chemistry*; D005960:Glucosides / Q000737:chemistry*; D007477:Ions / Q000737:chemistry*; D008958:Models, Molecular; D011725:Pyridines / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry*; D013997:Time Factors
chemical_list: D005025:Ethylene Dichlorides; D005960:Glucosides; D007477:Ions; D011725:Pyridines; D012996:Solutions; C507758:ethynylpyridine; C024565:ethylene dichloride; D003300:Copper