A coherent mixing mechanism explains the photoinduced nuclear polarization in photosynthetic reaction centers

Article Abstract:

A new mechanism for photoinduced nuclear polarization in reaction centers is presented. The mechanism requires no relaxation or cross-relaxation to generate large nuclear polarizations. The feasibility of the new mechanism was investigated through simulations of the nuclear polarizations for Bpheo N-VII and N-IV. Results showed that the mechanism is effective in terms of deriving the sign and order of magnitude of nuclear polarizations, time of the approach to steady state, MAS pattern and spinning sidebands intensities.

Research, Chemical reactions, Bacteria, Photosynthetic, Photosynthetic bacteria, Nuclear polarization, Polarization (Nuclear physics)

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Photophysics and optical limiting of platinum(II) 4'-arylterpyridyl phenylacetylide complexes

Article Abstract:

A series of platinum(II) 4'-aryl-2,2':6',2"-terpyridyl phenylacetylide complexes (5-8) with 4'-naphthyl, 4'-phenanthryl, 4'-anthryl, and 4'-pyrenyl substituents are synthesized and characterized. The results have shown that all complexes display optical limiting for 4.1 ns laser pulses at 532 nm, with 8 giving rise to the strongest optical limiting, presumably due to much longer triplet excited-state lifetime and the stronger transient absorption at 532 nm.

Optical properties, Platinum compounds, Properties, Structure

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A theoretical analysis of absorption spectra of photosynthetic reaction centers: mechanism of temperature dependent peak shift

Article Abstract:

Detailed analysis of the absorption spectra of the R26.Phe-a mutant RCs at various temperatures is presented constructing a model Hamiltonian based on the previous spectral analysis results. The adsorption spectra of R26.Phe-a mutant RCs at various temperatures is reconstructed and the calculated results show good agreement with the experiment reported by Huber et al.

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