Geometric Change of a Thiacalix[4]arene Supramolecular Gel with Volatile Gases and Its Chromogenic Detection for Rapid Analysis

详细信息    查看全文

• 作者：Ka Young Kim ; Sunhong Park ; Sung Ho Jung ; Shim Sung Lee ; Ki-Min Park ; Seiji Shinkai ; Jong Hwa Jung
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：March 17, 2014
• 年：2014
• 卷：53
• 期：6
• 页码：3004-3011
• 全文大小：412K
• 年卷期：v.53,no.6(March 17, 2014)
• ISSN：1520-510X

文摘

A coordination polymer gel that is self-assembled to form a network structure between a thiacalix[4]arene derivative (L) and Co²⁺ has been prepared. This gel is capable of selectively changing color in the presence of gases that yield hydrogen chloride upon hydrolysis. The UV鈥搗is absorption spectrum of a coordination polymer gel derived from Co(NO₃)₂ exhibits an absorption band at 527 nm and is colored red, indicating the formation of an octahedral Co²⁺ 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(NO₃)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 Co²⁺ complexes were obtained from a basic solution. From X-ray crystallographic analysis, the red Co²⁺ complex corresponds to an octahedral structure, while the blue Co²⁺ complex reflects the presence of a tetrahedral structure. Thus, the induced color change of Co²⁺ 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.