CNDO/2 calculations of the interactions of formamide and imidazole: Another failure of CNDO/2
β Scribed by S.F. Abdulnur; R.L. Flurry Jr.
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- English
- Weight
- 195 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
The interaction energy CPI-VC of the formamidc-imidazole system resulting from the CNDO/Z method exhibits n superfluous minimum at il much smaller separation than the sum of the van dcr Wn;rls radii of the closest atoms, and n low maximum at this latter distance. Yhc relatiocship of the interaction encrgics using CNDOj2 and those using the atomic charges on the two molcculcs is investigated for this system.
π SIMILAR VOLUMES
The possibility of a bias towards non-polar hydrogen bonded crystal structures in the CND0/2 method is investigated through calculations on a variety of ice lattices. The results susest that the suscepted bias exists. ## I _ Introduction Theories of intermolecular potentials may be checked fairly
Eight conformers typical of diketopiperazine (DKP) ring folding were chosen for analysis. Conf~ormational energy calculations were carried out using the semiempirical quantummechanical CNDOI:! method. The results obtained confirm considerable flexibility of'the IIKP skeleton. As the degree of' fold