Res. Chem. Intermed.
, Vol. 33, No. 1–2, pp. 169–175 (2007)
Also available online - www.brill.nl/rci
Effects of axial ligands on the intercalation of
tetraphenylporphyrinatoantimony(V) into smectite
and HARUO INOUE
Department of Applied Chemistry, Faculty of Engineering, Miyazaki University,
Gakuen-Kibanadai, Miyazaki 889-2192, Japan
Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachioji,
Tokyo, 192-0364, Japan
CREST, Japan Science and Technology Agency (JST), Tokyo, Japan
Received 20 October 2003; accepted 27 February 2004
Abstract—Adsorption and intercalation of +1-charged cationic dihydroxo(tetraphenylporphyrinato)-
antimony(V) bromide (1a) into an artiﬁcially synthesized smectite clay was investigated. The red shift
of the Soret band of 1a was observed in an aqueous clay colloidal solution owing to the adsorption
onto the clay. Analyses of the X-ray diffraction of the complex obtained between 1a and the clay
indicate the intercalation of 1a into the clay interlayer. The hydroxo group as an axial ligand led to
the effective intercalation of 1a into the clay.
Keywords: Porphyrinatoantimony(V) complexes; adsorption; intercalation; smectite clay.
Multilayered inorganic materials, such as clays, have been extensively studied
from the viewpoint of two-dimensional reaction sites for chemical reactions [1–3].
The adsorption and intercalation behavior on the interlayer surfaces has been in-
vestigated by photochemical methods using a variety of dyes as guest molecules
[4–7]. In particular, porphyrin and metalloporphyrin dyes are of interest because
of their photochemical activity, as well as their biochemical and catalytic function-
ality. Recently, several studies on the interactions between porphyrins and cation-
exchangeable clays have been reported [8–17]. In most reports, porphyrins having
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