Quantum-chemical calculations are used to investigate the conformational structure of 2,2'-bithiophene taken as a model for polythiophene. The geometries of the optimal syn and anti conformations are fully optimized at the ab initio level using a doublezeta polarized (DZP) basis set. The energetics
Theoretical investigation of the cyclic conformer of ozone
β Scribed by Shingkuo Shih; Robert J. Buenker; Sigrid D. Peyerimhoff
- Publisher
- Elsevier Science
- Year
- 1974
- Tongue
- English
- Weight
- 868 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
Ab initio SCF and CI calculations xc reported which find the cyclic conformer of czone to Iic 16 kczl/mole above the preferred (open-chain) form of this substance. Polarization functions ir! the A0 basis set are found to be quite important in this dctcrmination, strongly favorin g the cyclic species. The possible cxperimentzl significance of such a rclxtivcly stable ring conformer of ozone is nssesscd.
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Using ab initio theoretical approaches, we investigated the relative stability of two of the possible isomers of N-phenylbenzohydroxamic acid, PhCONOHPh. In particular, within the framework of density functional theory (DFT), we studied the cis and trans conformational isomers of PhCONOHPh, both in
A 3D quantum calculation is used to compute relative positions and intensities of the lines in the Huggins band of the ozone UV spectra. The calculation involves the recently computed ab initio 'Bz electronic state of Yamashita and Morokuma. The results confirm that this transition is responsible fo
## Abstract A comparative study has been made of the configurational effects on the conformational properties of Ξ±β and Ξ²βanomers of purine and pyrimidine nucleoside 3β²,5β²,βcyclic monophosphates and their 2β²βarabino epimers. Correlation between orientation of the base and the 2β²βhydroxyl group have
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