Geometric change of a thiacalix[4]arene supramolecular gel with volatile gases and its chromogenic detection for rapid analysis

Ka Young Kim, Sunhong Park, Sung Ho Jung, Shim Sung Lee, Ki Min Park, Seiji Shinkai, Jong Hwa Jung

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

A coordination polymer gel that is self-assembled to form a network structure between a thiacalix[4]arene derivative (L) and Co 2+ has been prepared. This gel is capable of selectively changing color in the presence of gases that yield hydrogen chloride upon hydrolysis. The UV-vis absorption spectrum of a coordination polymer gel derived from Co(NO 3 ) 2 exhibits an absorption band at 527 nm and is colored red, indicating the formation of an octahedral Co 2+ complex. Treatment with a small amount of volatile gases containing a chlorine atom (VGCl) causes a red shift of ∼150 nm, resulting in a new strong band with a maximum at 670 nm and a color change to blue. In addition, the red color of the filter paper coated with a Co(NO 3 ) 2 coordination polymer gel changed to blue upon exposure to VGCl, reflecting a change in the coordination geometry. Red and blue colors of single crystals of Co 2+ complexes were obtained from a basic solution. From X-ray crystallographic analysis, the red Co 2+ complex corresponds to an octahedral structure, while the blue Co 2+ complex reflects the presence of a tetrahedral structure. Thus, the induced color change of Co 2+ gel from red to blue upon exposure to VGCl is due to the coordination geometry. The quantitative concentration of VGCl was calculated by employing the RGB histogram available in a smartphone application.

Original languageEnglish
Pages (from-to)3004-3011
Number of pages8
JournalInorganic chemistry
Volume53
Issue number6
DOIs
Publication statusPublished - Mar 17 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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