Enantiomeric differences in ion association in a chiral solvent

Article Abstract:

The chiral solvent {S,S-(+)-2,3-dimethoxy-1,4-bis(dimethylamino)butane} was studied to determine the differences in its capability to go between the lithium cation and dianion of S-sec-butoxycyclooctatetraene or the lithium cation and the dianion of R-sec-butoxycyclooctatetraene. The analysis using 7Li nuclear magnetic resonance (NMR) spectra were considered. It was shown that differences existed in the 7Li NMR spectra for the R and S chiral isomers of the dilithium salts of the sec-butoxycyclooctatetraene dianion in the solvent indicating the presence of solvent-ion pair chiral recognition.

Chirality, Lithium, Lithium (Metal), Solvents, Enantiomers

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Deletion of the PsaF polypeptide modifies the environment of the redox-active phylloquinone (A1). Evidence for unidirectionality of electron transfer in photosystem I

Article Abstract:

Research was conducted to determine whether one or both branches of electron-transfer cofactors is active in Photosystem Ii (PS I) using a method that employed electron paramagnetic resonance spectroscopy and interposon mutagenesis. The failure to photoaccumulate a second A1- inthe wild-type and the psaE psaF mutant suggests that only one of the two resident PhQs in PS I is redox active.

Usage, Polypeptides, Oxidation-reduction reaction, Oxidation-reduction reactions, Electron paramagnetic resonance spectroscopy, Mutagenesis

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