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Comparative Study on the Catalytic Hydration of Carbon Dioxide by Catalysts that Mimic Carbonic Anhydrase Prepared with Zinc Salts
Author(s) -
Kim MinChul,
Lee SangYup
Publication year - 2015
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201402830
Subject(s) - chemistry , catalysis , carbonic anhydrase , inorganic chemistry , hydroxide , zinc hydroxide , zinc , hydrolysis , dissociation (chemistry) , salt (chemistry) , metal hydroxide , carbonic anhydrase ii , molecule , organic chemistry , enzyme
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 Znhydroxide 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 CO 2 hydration. Among the Zn salts with different anions, Zn(OH) 2 showed the highest catalytic performance with increased CO 2 hydrolysis activity. Spectroscopic and thermodynamic analyses proved the formation of histidineZnhydroxide 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.