Synthesis and Properties of a New Donor Model Compound for PSⅡ

Abstract

Abstract: As a model compound for redox components on the donor side of photosystem Ⅱ(PSⅡ) in green plants, a supramolecular complex 2 was synthesized and characterized. In this complex, two {[(2-hydroxy-3-(morpholin-4-ylmethyl)-5-tert-butyl-benzyl)(pyridyl-2-methyl)amino]methyl} arms are linked to the ortho-positions of a phenol which is expected covalently to be linked to Ru(Ⅱ) tris-bipyridine through an amide bond. The arms on the substituted-phenol can coordinate two Mn(Ⅲ) ions. The structure of complex 2 was confirmed by electrospray ionization mass spectrometry(ESI-MS) and 2D-NMR(gCOSY, HSQC and HMBC). Its photochemical and electrochemical properties were studied. The results showed that the MLCT band of the compound was red-shifted compared to that of [Ru(bpy)₃]²⁺ and the luminescence quantum yield was enhanced. In addition, the oxidation potential of ruthenium was higher than the phenol+/phenol and Mn(Ⅲ, Ⅳ)/Mn(Ⅲ), which was consisted with the electron transfer sequence of the donor side of PSⅡ in nature. All these showed that this compound was a good model to mimic the donor side of PSⅡ.

Key words: Ligand design, Phenolate ligand, Dinuclear complex, Water oxidation, Photosystem Ⅱ, Artificial photosynthesis

CLC Number:

O641.4

TrendMD:

SHI Feng, LI Hong-Yang, PENG Xiao-Jun, CHEN Xiao-Qiang, ZHANG Rong, WANG Dong-Ping, FAN Jiang-Li, SUN Li-Cheng . Synthesis and Properties of a New Donor Model Compound for PSⅡ[J]. Chem. J. Chinese Universities, 2004, 25(9): 1666.

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