liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
A Biomimetic Manganese Model for Artificial Photosynthesis: Q-band Electron Paramagnetic Resonance Study of a Novel Mn2(II,III) Complex
Linköping University, Department of Science and Technology.
2005 (English)Independent thesis Basic level (professional degree), 20 points / 30 hpStudent thesis
Abstract [en]

In natural oxygen-producing photosynthesis solar energy is stored as chemical energy, in carbohydrates, fats and amino acids, using water as electron source. The large transmembrane protein complex, PSII, is the key enzyme in the light-driven reactions. Water oxidation is accomplished by a triad in PSII in which the Mn-cluster plays an important role. In the artificial photosynthetic system, nature’s photosynthesis will be mimicked such that hydrogen, a sustainable energy source, can be produced from solar energy and water alone. Since water oxidiation requires the catalytic activity of a Mn-cluster in photosynthesis, different artificially constructed manganese complexes are investigated.

The dinuclear ([Mn2(II,III)L(µ-OAc)2]ClO4), where L is the X-anion of 2-(N,N-Bis(2-methylpyridyl)aminomethyl)-6-(N-(3,5-ditert-butylbenzyl-2-hydroxy)-N-(pyridylmethyl)aminomethyl)-4-methylphenol, an unsymmetric ligand with two coordinating phenolate groups, has been studied. The two Mn-ions are linked via a mono-µ-oxo bridge and two acetate ligands. Q-band Electron Paramagnetic Resonance was conducted on the Unsymmetric Mn2(II,III) Complex. Aquired results show that the complex has a 2600 Gauss broad signal (11 400-14 000 Gauss) with 14-17 lines at g~2 and hyperfines of 120 Gauss. This is consistent with previous X-band studies. Q-band spectra of the Unsymmetric Mn(II,III) display increased hyperfine resolution compared to Qband spectra of the symmetric complex, Mn2(bpmp)(µ-OAC)2. This is noticeable since Unsymmetric Mn2(II,III) and Mn2 (bpmp)(µ-OAC)2 partly overlap in low-frequency experiments (X-band EPR).

Further investigations are yet to be expected. Nevertheless, the conducted thesis study provides important knowledge in the futuristic goal of building an artificial super-complex.

Place, publisher, year, edition, pages
Institutionen för teknik och naturvetenskap , 2005. , 53 p.
Keyword [en]
Photosynthesis, manganese, electron paramagnetic resonance
National Category
URN: urn:nbn:se:liu:diva-4246ISRN: LiTH-IFM-EX--05/1377--SEOAI: diva2:20571
Available from: 2005-10-19 Created: 2005-10-19

Open Access in DiVA

fulltext(1611 kB)1285 downloads
File information
File name FULLTEXT01.pdfFile size 1611 kBChecksum SHA-1
Type fulltextMimetype application/pdf

By organisation
Department of Science and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 1285 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 605 hits
ReferencesLink to record
Permanent link

Direct link