The conformational behaviour and the charge distribution of methylphosphorylcholine has been analyzed within the framework of the PCILO method including phosphorus-oxygen o-and 7r-bonds. In the global minimum of energy the -O-P-O-C-C chain has a (-synclinal, -synclinal, -syn/anticlinal, +anticlinal)
Semiempirical quantum chemical calculation on the chlorophyll—water system and determination of excitonic characteristics of a model chloroplast
✍ Scribed by Sambhu Nath Datta; Satyam Priyadarshy
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 499 KB
- Volume
- 173
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Molecular orbitals of the chlorophyll-water system and its dimer have been calculated by the CNDO method. The CNDO/S excitation energies have been computed. Excitonic characteristics of a model crystal of chlorophyll-water molecules have been calculated. The dimensions of the model crystal are same as those of a typical thylakoid unit. Characteristics of the trap (chlorophyll special pair) have also been determined.
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A modified CNDO-APSG procedure to obtain the charge distributions of the headgroups of phosphatidylserine, -ethanolamine and -choline as monomers and as constituents of hexagonal lattice is presented. The calculated charge distributions are typically zwitter-ionic. There is only a small difference b
Reactions of metallated nucleophiles M I Y [Y = OR, SR, NR 2 , of a systematic analysis of the bonding parameters determined for the tmp 2 AlY compounds, combined with a PR 2 , AsR 2 , CR 3 , Si(SiMe 3 ) 3 , R = organyl, H] with bis(2,2,6,6tetramethylpiperidino)aluminum halides [tmp 2 AlX, (X = Cl,