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Adsorption and stacking behaviour of zwitterionic porphyrin on the clay surface†

Published online by Cambridge University Press:  09 July 2018

T. Eyama ,
Y. Yogo ,
T. Fujimura ,
T. Tsukamoto ,
D. Masui ,
T. Shimada ,
H. Tachibana ,
H. Inoue  and
S. Takagi
T. Eyama
Affiliation:
Department of Applied Chemistry, Graduate Course of Urban Environmental Sciences, Tokyo Metropolitan University, Hachiohji, Tokyo 192-0397, Japan
Y. Yogo
Affiliation:
Department of Applied Chemistry, Graduate Course of Urban Environmental Sciences, Tokyo Metropolitan University, Hachiohji, Tokyo 192-0397, Japan
T. Fujimura
Affiliation:
Department of Applied Chemistry, Graduate Course of Urban Environmental Sciences, Tokyo Metropolitan University, Hachiohji, Tokyo 192-0397, Japan
T. Tsukamoto
Affiliation:
Department of Applied Chemistry, Graduate Course of Urban Environmental Sciences, Tokyo Metropolitan University, Hachiohji, Tokyo 192-0397, Japan
D. Masui
Affiliation:
Department of Applied Chemistry, Graduate Course of Urban Environmental Sciences, Tokyo Metropolitan University, Hachiohji, Tokyo 192-0397, Japan
T. Shimada
Affiliation:
Department of Applied Chemistry, Graduate Course of Urban Environmental Sciences, Tokyo Metropolitan University, Hachiohji, Tokyo 192-0397, Japan
H. Tachibana
Affiliation:
Department of Applied Chemistry, Graduate Course of Urban Environmental Sciences, Tokyo Metropolitan University, Hachiohji, Tokyo 192-0397, Japan
H. Inoue
Affiliation:
Department of Applied Chemistry, Graduate Course of Urban Environmental Sciences, Tokyo Metropolitan University, Hachiohji, Tokyo 192-0397, Japan
S. Takagi*
Affiliation:
Department of Applied Chemistry, Graduate Course of Urban Environmental Sciences, Tokyo Metropolitan University, Hachiohji, Tokyo 192-0397, Japan PRESTO (Precursory Research for Embryonic Science and Technology), Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama, Japan
*
*E-mail: takagi-shinsuke@tmu.ac.jp
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Abstract

Zwitterionic porphyrin (tetrakis {4-(2-carboxyethyl)pyridinio}porphyrin (TPyCP)) with four pyridinium and carboxyl groups in the molecule was synthesized. The adsorption behaviour of TPyCP on the montmorillonite clay surface was examined in an aqueous colloidal solution. While the adsorption maximum λmax of TPyCP was 424 nm in water, it shifted to longer wavelengths on complex formation with clay. The λmax on the exfoliated clay surface was 450 nm, and that in the stacked clay sheets was 471 nm, respectively. Under alkaline conditions ([NaOH] = 2 × 10–4 M), the stacking behaviour of the clay was completely suppressed. It emerged that anionic parts in the porphyrin molecule can suppress the stacking of clay sheets. Judging from the quantitative analysis, the maximum adsorption amount of TPyCP was 100% vs. cation exchange capacity (CEC) of the clay. As the adsorption density of TPyCP increased, λmax shifted slightly to longer wavelengths due to the interactions between adjacent porphyrins. When the loading level of TPyCP was 200% vs. CEC, the stacking of TPyCP was indicated. The average stacking layer number was calculated to be 1.48. On the other hand, it is known that tetra cationic porphyrins without anionic parts do not form such stacking structures. Thus, it seems that zwitterionic porphyrin has the potential to form a three dimensional structure through electrostatic interactions between porphyrins on the clay surface.

Keywords

montmorillonitezwitterionic porphyrinelectrostatic interactionorganic dyesize-matching rule
Type
Research Papers
Information
Clay Minerals , Volume 47 , Issue 2 , June 2012 , pp. 243 - 250
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2012

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Footnotes

†

Presented at the Euroclay 2011 Conference at Antalya, Turkey

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