NDLI: New platinum and ruthenium Schiff base complexes for water splitting reactions

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Chen, Yong Fu, Wen-fu Wang, Chuanjun
Description	Author Affiliation: Wang C ( Key Laboratory of Photochemical Conversion and Optoelectronic Materials and HKU-CAS Joint Laboratory on New Materials, Technical Institute of Physics and Chemistry and University of Chinese Academy of Sciences, CAS, Beijing, 100190, People's Republic of China. fuwf@mail.ipc.ac.cn.)
Abstract	New platinum(II) and ruthenium(II) mononuclear complexes with naphthalene-based Schiff base ligands $L_{1}$ $(H_{2}–selnaph)$ and $L_{2}$ $(H_{2}–selnaph–COOH)$ were synthesized: Pt–selnaph (1), Pt–selnaph–COOH (2), $Ru–selnaph(4-picoline)_{2}$ (3), and $Ru–selnaph(isoquinoline)_{2}$ (4). The complexes were characterized by NMR spectroscopy, matrix-assisted laser desorption/ionization time-of-flight spectrometry, and elemental analysis, and their electrochemical and photophysical properties were investigated. The luminescent complexes 1 and 2 were used as photosensitizers for visible-light driven hydrogen production reactions in the presence of sacrificial electron donor triethylamine and cocatalyst precursor $K_{2}PtCl_{4}$ aqueous solution. When complex 2 was attached to the surface of $TiO_{2}$ by a carboxyl group, enhanced hydrogen photogeneration was achieved compared with complex 2 alone, with turnover numbers of about 84 after 12 h irradiation. Calculations based on electrochemical and spectroscopic data also confirmed the feasibility of electron injection through the carboxyl group of complex 2 into the conduction band of $TiO_{2}$ for hydrogen production reactions. Complexes 3 and 4 were found to be efficient stable water oxidation $(NH_{4})_{2}Ce(NO_{3})_{6}-driven$ catalysts with a first-order reaction behavior. A turnover frequency of 5.34 $min^{−1}$ was achieved for complex 3, while complex 4 exhibited an enhanced turnover frequency of 11.9 $min^{−1}$ in pH 1.0 aqueous solution. Turnover numbers up to 1400 and 2060 were obtained after 6.5 h of reaction for 3 and 4, respectively. Unique mechanistic information for water splitting is also presented through electrochemical, spectroscopic and ESI-MS high-valent ruthenium-oxo intermediate investigations.
ISSN	14779226
Issue Number	32
Journal	Dalton Trans.
Volume Number	44
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-08-28
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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