Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (10): 1742-1749.DOI: 10.1016/S1872-2067(15)60895-6

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Effects of Br substituent on catalytic performance of Ru-bda (H2bda = 2,2'-bipyridine-6,6'-dicarboxylic acid) catalysts for water oxidation

Zhao Liu, Yan Gao, Ze Yu, Min Zhang, Jianhui Liu   

  1. Institute of Artificial photosynthesis, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, Liaoning, China
  • Received:2015-04-08 Revised:2015-05-18 Online:2015-09-26 Published:2015-09-26
  • Supported by:

    This work was supported by the National Basic Research Program of China (973 program) (2014CB239402), the National Natural Science Foundation of China (20923006, 21120102036, 21106015, 91233201), and the Fundamental Research Funds for the Central Universities (DUT13RC(3)103, DUT15LK08).

Abstract:

A series of new Ru-bda catalysts with Br modification on the equatorial ligand, [Ru(Ln)(picoline)2] (H2L1 = 4-Br-2,2'-bipyridine-6,6'-dicarboxylic acid (4-Br-bda), 2; H2L2 = 4,4'-diBr-bda, 3) and [Ru(L1)(isoquinoline)2] 5, were synthesized for catalytic water oxidation. Compared with the un-substituted catalysts, the catalysts modified with Br displayed a marked change in the catalytic activities and reaction orders. The results confirm that the electronic effect of Br has a large effect on the kinetics and leads to the change in reaction orders.

Key words: Water oxidation, Ruthenium-bda catalyst, Bromine modification, Electronic effect, Kinetic studies