title: Effect of layer charge density on orientation and aggregation of a cationic laser dye incorporated in the interlayer space of montmorillonites.
abstract: Effect of layer charge density of clay on the orientation and aggregation state of a laser dye, oxazine 4, in dye/clay complexes was investigated using a series of layer-charge-controlled montmorillonites as host materials. By the combination of polarized UV-vis spectroscopy and powder X-ray diffraction methods, it was revealed that the higher layer charge caused the formation of higher-order H-aggregates with the molecular axis nearly perpendicular to the silicate layer, and that the basal spacing was mostly governed by the degree of dye aggregation.
authors.affiliation: Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: Yoshiro
authors.initials: Y
authors.lastname: Kaneko
authors.forename: Nobuo
authors.initials: N
authors.lastname: Iyi
authors.forename: Juraj
authors.initials: J
authors.lastname: Bujdák
authors.forename: Ryo
authors.initials: R
authors.lastname: Sasai
authors.forename: Taketoshi
authors.initials: T
authors.lastname: Fujita