Self-assembly and imprinting of macrocyclic molecules in layer-by-layered TiO2 ultrathin films

Kazuma Araki, Do Hyeon Yang, Tao Wang, Roman Selyanchyn, Seung Woo Lee, Toyoki Kunitake

Research output: Contribution to journalArticle

14 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)72-81
Number of pages10
JournalAnalytica Chimica Acta
Volume779
DOIs
Publication statusPublished - May 24 2013
Externally publishedYes

Fingerprint

imprinting
Ultrathin films
Self assembly
Molecules
carboxylic acid
gel
porphyrin
Carboxylic Acids
cobalt
transmission electron microscopy
Gels
Quartz Crystal Microbalance Techniques
scanning electron microscopy
spectroscopy
porphine
crystal
quartz
Quartz crystal microbalances
Porphyrins
Polymethyl Methacrylate

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

Cite this

Self-assembly and imprinting of macrocyclic molecules in layer-by-layered TiO2 ultrathin films. / Araki, Kazuma; Yang, Do Hyeon; Wang, Tao; Selyanchyn, Roman; Lee, Seung Woo; Kunitake, Toyoki.

In: Analytica Chimica Acta, Vol. 779, 24.05.2013, p. 72-81.

Research output: Contribution to journalArticle

Araki, Kazuma ; Yang, Do Hyeon ; Wang, Tao ; Selyanchyn, Roman ; Lee, Seung Woo ; Kunitake, Toyoki. / Self-assembly and imprinting of macrocyclic molecules in layer-by-layered TiO2 ultrathin films. In: Analytica Chimica Acta. 2013 ; Vol. 779. pp. 72-81.
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