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Reference type: Journal
Authors: Araki K, Yang DH, Wang T, Selyanchyn R, Lee SW, Kunitake T
Article Title: Self-assembly and imprinting of macrocyclic molecules in layer-by-layered TiO2 ultrathin films.
Publication date: 2013
Journal: Analytica Chimica Acta
Volume: 779
Page numbers: 72-81.
DOI: 10.1016/j.aca.2013.04.009
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0003267013005023

Abstract: Alternate TiO2 gel ultrathin films assembled with a macrocyclic carboxylic acids of tetrakis-4-carboxyphenyl porphine (TCPP) or tetra-4-carboxylphthalocyanine cobalt (II) (Co-TCPc) were prepared by the surface sol-gel process. To confirm the film growth and imprinting effect, quartz crystal microbalance (QCM) and UV-vis spectroscopy measurements were employed. The binding of TCPP was 1.2-14.3 times more selective compared to structurally related macrocyclic guest molecules. Among other findings, tetrakis-4-carboxymethyloxyphenyl porphine (TCMOPP) that has a spacer (OCH2) between the phenyl rings and carboxylic acid moieties of TCPP showed a significantly lower binding efficiency equal to 0.07, regardless of its similar molecular structure to the template molecule. Structural difference of porphyrin and phthalocyanine analogs could be also selectively discriminated: the TCPP imprinted film showed ca. 13 times higher selectivity for recognition of TCPP itself from the mixture of TCPP and Co-TCPc. Characterization by AFM demonstrated that the TiO2/TCPP film has highly uniform surface and ultrathin thickness, while both TEM and SEM studies confirmed the immobilized structures of TCPP inside the film
Template and target information: tetrakis-4-carboxyphenyl porphine, TCPP, tetra-4-carboxylphthalocyanine cobalt (II), Co-TCPc
Author keywords: porphyrin, Phthalocyanine, molecular imprinting, surface sol-gel process

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