biradical


Also found in: Dictionary.

biradical

[bī′rad·ə·kəl]
(chemistry)
A chemical species having two independent odd-electron sites.
References in periodicals archive ?
[14.] Breher F Stretching bonds in main group element compounds-Borderlines between biradicals and closed-shell species.
While a stepwise-biradical mechanism is usually found in the decomposition of these cyclic peroxides, it can be further subdivided: the biradical is formed due to an electron transfer from an electron-rich moiety to the dioxetanone, thereby forming a radical cation and a radical anion, respectively; the biradical is formed due to the homolytic cleavage of the [O.sub.1] - [O.sub.4] bond.
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.g.
When the ethylene molecule is within the vertical projection of benzene shape, excitation leads to a [C.sub.1] - [C.sub.7] bonded intermediate, which evolves to an electroneutral biradical and then to a zwitterionic intermediate at an avoided crossing.
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.
This is, however, prevented to a large extent by its saturation with the stable biradical (air) oxygen.
Greensboro, in February 1960, was the perfect locale for the trigger event, with a population of 123,000 (only 25 percent black, hence no major threat), five colleges, including two black and one Quaker (white), in a part of the state historically opposed to the political domination of the plantation counties of Eastern North Carolina, an NAACP leadership not adverse to calling in a competing organization, CORE, for help, and a relatively enlightened city government willing to set up a biradical committee to mediate.
The reaction proceeds via a triplet biradical and is thus not stereospecific.
Semitic linguists offer their Swiss-born British colleague 26 papers on such topics as Semitic triradicalism and the biradical question, some parallels in linguistic development between Biblical Hebrew and Neo-Aramaic, the script of Taiman, a questionable theory of Egyptian influence on a genre of Hebrew literature, Dinah in a Syriac poem on Joseph, an archaic Amharic poem on condemning wealth and glory, Dante and modern Hebrew literature, and humor in the novels of Peretz Smolenskin.
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.