ETUDE THEORIQUE DES SPECTRES ELECTRONIQUES DE DBRIVES DITHIOLIQUES G. PFISTER-GUILLOUZO, D. GONBEAU et J. DESCHAMPS Dam le cadre d'une etude experimentale et theorique des heterocycles sulfur&, nous avons abord6 I'examen de derives du dithiole-1,3 et du dithiole-1,2 en utilisant la methode C.N.D.O.
Étude Théorique de Molécules Conjuguées. III. Les fondements théoriques des procédés de Pariser et Parr
✍ Scribed by G. Leroy
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2010
- Weight
- 710 KB
- Volume
- 75
- Category
- Article
- ISSN
- 0037-9646
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✦ Synopsis
The nature of the Pariser and Parr ''atomic orbitals" in their non empirical and semiempirical procedures is briefly discussed. It appears that the Pari ser and Parr approximations are generally valid if the overlap matrix can be calculated using Slater atomic orbitals and if the Mulliken approxima tion remains valid when empirical Coulomb integrals are used. oh ys s'icrit explicitement : 1 YL = -(*) Charg6 de cours ti l'Universit6 de Louvain.
📜 SIMILAR VOLUMES
The method described in the two previous papers of this series is further extended to poly-aza-derivatives of the conjugated hydrocarbons by fitting the integral (N +:NN) to the first singlet-singlet transition of pyridazine. Results are in satisfactory agreement with experiment.
Using parameters fitted to the pyridine spectrum, SCF calculations have been carried through for seven monoaza cyclic compounds. The results obtained are discussed in the light of available experimental data and attention is particularly drawn to the electronic spectra and the ionization potentials.
The e l e c t r o n i c band s t r u c t u r e s o f various neutral and charged forms o f p o l y a n i l i n e are d i scussed. The MNOO semiempirical technique is used t o determine the p o l y a n i l i n e chain geometries. Band-structure c a l c u l a t i o n s , based on those geometries, ar