biradical


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biradical

[bī′rad·ə·kəl]
(chemistry)
A chemical species having two independent odd-electron sites.
References in periodicals archive ?
The simultaneous occurrence of 3G and AG within a paradigm can be found in trisyllabic biradical verbs such as kavella 'to walk', where 3G occurs in the 1st and 2nd person of the present and past singular of the indicative mood (e.
In a breakthrough paper published in Science, researchers from The University of Manchester, The University of Bristol and Sandia National Laboratories report the potentially revolutionary effects of Criegee biradicals.
These two phonemes supposedly do not operate on the same level as the previously assumed biradical roots (pp.
In addition, FTIR spectra indicated increased regularity of polypropylene segments in HPEC during aging at 433 K; and ESR spectra showed the formation of nitroxide biradicals as a result of thermal treatment at 433 K.
We have studied the nitroxide-mediated polymerization of styrene in miniemulsion, with the intent of maintaining a high degree of livingness by balancing the rates of biradical termination and disproportionation.
It is much more reasonable to postulate derivation from bn, a biradical.
The synthesis of pyrrolo-[1,4]-benzodiazepines involves an interesting photochemical cyclization step that shows a remarkable memory of chirality effect via a 1,7-triplet biradical.
Other analyses, in contrast, have preferred to take the truncated form of the stem (vib-) to be the original shape, and the radical w- of the past stem (wavab-) to be a prefixed element by which what was originally a biradical stem has been incorporated into the triradical model of Semitic morphology.
After setting out principles and practice, they cover the photogeneration of carbon-centered radicals, heteroatom-centered radicals, biradicals and radical pairs, radical ions, carbocations and carbanions, and cargenes and nitrenes.
German chemist Rudolf Criegee first hypothesised the existence of a group of atmosphere intermediates, now known as Criegee biradicals, during the 1950s.
According to researchers from The University of Manchester, The University of Bristol and Sandia National Laboratories, Criegee biradicals are invisible chemical intermediates and are powerful oxidisers of pollutants such as nitrogen dioxide and sulfur dioxide, produced by combustion.
Criegee biradicals react further to form compounds such as limonic acid, limonal-dehyde, and limononic acid.