Electron Nuclear Double Resonance in Photoexcited Triplet‐State Benzene‐h6 Molecules in Benzene‐d6 Single Crystals

1968 ◽  
Vol 49 (9) ◽  
pp. 4235-4236 ◽  
Author(s):  
A. M. Ponte Goncalves ◽  
Clyde A. Hutchison
Keyword(s):  
Triplet State ◽  
Single Crystals ◽  
Double Resonance ◽  
Electron Nuclear Double Resonance

scholarly journals Electron Nuclear Double Resonance of the Chlorophyll Triplet State in the Water-Soluble Chlorophyll Protein from Brassica oleracea: Investigation of the Effect of the Binding Site on the Hyperfine Couplings

2020 ◽  
Vol 51 (9-10) ◽  
pp. 925-937
Author(s):  
Alessandro Agostini ◽  
Daniel M. Palm ◽  
Harald Paulsen ◽  
Marilena Di Valentin ◽  
Donatella Carbonera
Keyword(s):  
Triplet State ◽  
Brassica Oleracea ◽  
Double Resonance ◽  
Water Soluble ◽  
Triplet States ◽  
Triplet Energy ◽  
Electron Nuclear Double Resonance ◽  
Light Harvesting Complexes ◽  
Chlorophyll Protein ◽  
Hyperfine Couplings

Abstract An investigation of the photoexcited triplet state of chlorophyll (Chl) a in the water-soluble chlorophyll protein (WSCP) of Brassica oleracea has been carried out by means of electron-nuclear double resonance (ENDOR), achieving a complete assignment of the observed hyperfine couplings corresponding to methine protons and methyl groups of Chl a triplet state. The triplet-state properties, and in particular the hyperfine couplings, were found to be similar to those previously reported for Chl a in the WSCP of Lepidium virginicum. Therefore, the porphyrin ring deformation observed in Brassica oleracea WSCP seems to only slightly affect the spin density of 3Chl a. This may be relevant when considering the robustness of triplet–triplet energy transfer mechanisms, relying on wavefunction overlap, in systems, such as the photosynthetic light-harvesting complexes, in which Chl triplet states with distorted geometries are involved.

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