Imidazolium or guanidinium/layered manganese (III, IV) oxide hybrid as a promising structural model for the water-oxidizing complex of Photosystem II for artificial photosynthetic systems

Mohammad Mahdi Najafpour, Mahmoud Amouzadeh Tabrizi, Behzad Haghighi, Julian J. Eaton-Rye, Robert Carpentier, Suleyman I. Allakhverdiev

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Photosystem II is responsible for the light-driven biological water-splitting system in oxygenic photosynthesis and contains a cluster of one calcium and four manganese ions at its water-oxidizing complex. This cluster may serve as a model for the design of artificial or biomimetic systems capable of splitting water into oxygen and hydrogen. In this study, we consider the ability of manganese oxide monosheets to self-assemble with organic compounds. Layered structures of manganese oxide, including guanidinium and imidazolium groups, were synthesized and characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction spectrometry, and atomic absorption spectroscopy. The compounds can be considered as new structural models for the water-oxidizing complex of Photosystem II. The overvoltage of water oxidation for the compounds in these conditions at pH = 6.3 is ~0.6 V. These compounds may represent the first step to synthesize a hybrid of guanidinium or imidazole together with manganese as a biomimetic system for the water-oxidizing complex of Photosystem II.

Original languageEnglish
Pages (from-to)413-421
Number of pages9
JournalPhotosynthesis research
Volume117
Issue number1-3
DOIs
Publication statusPublished - Nov 1 2013

Keywords

  • Artificial photosynthesis
  • Guanidinium
  • Imidazolium
  • Manganese
  • Nano-layered manganese oxide
  • Photosystem II

ASJC Scopus subject areas

  • Biochemistry
  • Plant Science
  • Cell Biology

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