title: Observation of characteristic IR band assignable to dimerized copper ions in montmorillonite.
abstract: Copper ion-exchanged montmorillonite clays, which had been prepared by ion exchange in an aqueous solution of CuCl(2) at a temperature above 323 K, exhibited the characteristic IR band in the region 3360-3310 cm(-1). No such bands were observed for the samples prepared by using different ion-exchange solutions and at different temperatures. From the spectroscopic observations, it was revealed that the ion-exchanged copper ions (Cu(2+)) are in the form of dimerized species by bridging two hydroxyls, [Cu(2+) <(OH(-)(2) > Cu(2+)], in montmorillonite.
authors.affiliation: Research Laboratory for Surface Science, Faculty of Science, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Tanaka
authors.forename: Atsushi
authors.initials: A
authors.lastname: Itadani
authors.forename: Takahiro
authors.initials: T
authors.lastname: Abe
authors.forename: Hideki
authors.initials: H
authors.lastname: Taguchi
authors.forename: Mahiko
authors.initials: M
authors.lastname: Nagao