1. Heterogeneous catalase-like activity of gold(<scp>i</scp>)–cobalt(<scp>iii</scp>) metallosupramolecular ionic crystals
- Author
-
Yusuke Yamada, Takumi Konno, Sai Prakash Maddala, Naoto Kuwamura, Mihoko Yamada, Akira Sekiyama, Koji Harano, Satoshi Okada, Eiichi Nakamura, Toru Saito, Kohei Yamagami, Tomoyoshi Suenobu, Keisuke Yamanaka, and Nobuto Yoshinari
- Subjects
Aqueous solution ,biology ,010405 organic chemistry ,Chemistry ,Inorganic chemistry ,Cationic polymerization ,chemistry.chemical_element ,Ionic crystal ,General Chemistry ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences ,Crystal ,Crystallography ,Catalase ,biology.protein ,Cobalt - Abstract
Unique heterogeneous catalase-like activity was observed for metallosupramolecular ionic crystals [AuI4CoIII2(dppe)2(d-pen)4]X n ([1]X n ; dppe = 1,2-bis(diphenylphosphino)ethane; d-pen = d-penicillaminate; X n = (Cl-)2, (ClO4-)2, (NO3-)2 or SO42-) consisting of AuI4CoIII2 complex cations, [1]2+, and inorganic anions, X- or X2-. Treatment of the ionic crystals with an aqueous H2O2 solution led to considerable O2 evolution with a high turnover frequency of 1.4 × 105 h-1 for the heterogeneous cobalt complexes, which was dependent on their size and shape as well as the arrangement of cationic and anionic species. These dependencies were rationalized by the presence of cobalt(ii) centers on the crystal surface and their efficient exposure on the (111) plane rather than the (100) plane based on morphological and theoretical studies.
- Published
- 2017
- Full Text
- View/download PDF