Proton hyperfine coupling constants for some planar and non-planar xanthyl radicals are calculated by the unrestricted Hnrtree-Fock method and compared with the e.'cper-imental data. Recentlv ESR data has become available rll for-a se&s of xanthyl -radicals (see fig. 1). 'L this paper we make a sys
Unrestricted Hartree-Fock calculations of spin density distributions in some alkyl radicals
β Scribed by N.K. Ray; P.T. Narasimhan
- Publisher
- Elsevier Science
- Year
- 1968
- Tongue
- English
- Weight
- 192 KB
- Volume
- 2
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
Spin density distributions in ethyl, isopropyl and t-butyl radicals have been obtained by employing the unrestricted
Hartree-Fock procedures and using hyperconjugative and hyperconjugative-inductive models for the methyl group. The results are in quite good agreement with experiment.
π SIMILAR VOLUMES
An additivity model has been found to be adequate for predicting unrestricted Hartree-Fock spin densities and chzuge densities in vyious fluorinated naphthalkne radical utions. '. ' '..
A msterdarn, The ~et~~er~l~~s (213rir prrb!icution of ihe Vtru der Wads Fund) Received 8 May19i3 A semi-empirical unrestricted Hytree-Fock MO method has been developed for the purpose of calculating the Fermi contact term Ln trsnsition metal complexes. An application tu the systems CuCIiand hinCl:-,
Spin-restricted and unrestricted post-Hartree-Fock calculations were carried out for clusters of triplet methylene and nitroxide radicals. The UHF-based methods such as UMP and QCISD followed by approximate spin projection provide reasonable energy differences between the high-and low-spin states of
EPR and ENDOR spectra were recorded for 2-methyl-9,lO-anthraquinone (tmethylAQ), 2-ethylAQ, 2-tert-butylAQ and 2,fdimethylAQ anion radicals in the solution phase. The EPR spectra were simulated with the help of ENDOR data. The experimental isotropic hyperfine coupling constants (IHFCs) were compared