compromise between the steric repulsion and the hydrophobic attraction between the
alkyl chains, respectively.
By freeze-drying the suspensions, auramine O (Scheme 3) was hybridized with
three montmorillonites SYn-1, SAz-1, and SWy-1 obtained from Source Clays
Repository of the Clay Minerals Society [63]. The basal spacings of SYn-1 and
SAz-1 did not change by the hybridization, while the absorption due to H-aggregate
was observed. The authors proposed that auramine O was adsorbed on the external
surface of SYn-1 and SAz-1 as H-aggregates. The absorption and the emission of Jand the H-aggregates of auramine O were observed for SWy-1 depending on the dye
loading.
Structure of the intercalation compounds of an amphiphilic cationic azobenzene
(AZC 2 N
+
C 2 OH, in Scheme 3) KF was proposed from the basal spacing (1.86 nm,
corresponding to the gallery height of 0.9 nm) and the bathochromic shift of the
Scheme 3 Molecular structures of dyes which formed aggregates in layered materials
Photofunctions of Dye-Clay Hybrids: Recent Developments
263
alkyl chains, respectively.
By freeze-drying the suspensions, auramine O (Scheme 3) was hybridized with
three montmorillonites SYn-1, SAz-1, and SWy-1 obtained from Source Clays
Repository of the Clay Minerals Society [63]. The basal spacings of SYn-1 and
SAz-1 did not change by the hybridization, while the absorption due to H-aggregate
was observed. The authors proposed that auramine O was adsorbed on the external
surface of SYn-1 and SAz-1 as H-aggregates. The absorption and the emission of Jand the H-aggregates of auramine O were observed for SWy-1 depending on the dye
loading.
Structure of the intercalation compounds of an amphiphilic cationic azobenzene
(AZC 2 N
+
C 2 OH, in Scheme 3) KF was proposed from the basal spacing (1.86 nm,
corresponding to the gallery height of 0.9 nm) and the bathochromic shift of the
Scheme 3 Molecular structures of dyes which formed aggregates in layered materials
Photofunctions of Dye-Clay Hybrids: Recent Developments
263