Comparative Study on the Catalytic Hydration of Carbon Dioxide by Catalysts that Mimic Carbonic Anhydrase Prepared with Zinc Salts. Issue 4 (19th January 2015)

• Record Type: Journal Article
• Authors: Kim, Min‐Chul; Lee, Sang‐Yup
• Is Part Of: ChemCatChem. Volume 7:Issue 4(2015:Feb.)
• Page Start: 698
• Page End: 704
• Publication Date: 2015-01-19
• Subjects: Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201402830
• Languages: English
• ISSNs: 1867-3880

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Recently, a new catalyst that mimics carbonic anhydrase (CA) was constructed by the self‐assembly of histidyl bolaamphiphilic molecules and a Zn ion cofactor. The catalytic Zn ion complex in a tetrahedral coordination geometry is composed of self‐organized histidyl imidazoles and a single hydroxide ion. However, the Znhydroxide coordination, the key structure of the catalytic analogue, is disturbed by the pairing anion of the Zn salt. Here, the performances of the CA‐mimicking catalysts prepared from various Zn salts were examined along with CO₂ hydration. Among the Zn salts with different anions, Zn(OH)₂ showed the highest catalytic performance with increased CO₂ hydrolysis activity. Spectroscopic and thermodynamic analyses proved the formation of histidineZnhydroxide coordination with a lowered activation energy if Zn(OH)₂ was used. With regard to the anion interaction with the Zn ion, the catalytic performance is inversely proportional to the solution dissociation energy of the Zn salt.</p> </abstract>