The variables C 1 , . . ., tNC (= ( 5 ) ) (appearing on p. 479, line 6 starting from the bottom) and ne,h = -iAVCn (on p. 479, line 4 starting from the bottom) should be
Molecular mechanics parameterization: Bond lengths and angles for nitrogen and phosphorus containing compounds
β Scribed by Joseph M. Leonard; William P. Ashman
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 556 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0192-8651
No coin nor oath required. For personal study only.
β¦ Synopsis
Molecular mechanics provides an excellent means of generating reasonable chemical structures in a short amount of time. Using a classical representation, a molecule can be partitioned into a collection of n-fold atomic interactions, each with an associated force constant. In order for a calculation to proceed, all of the required force constants must be known. This article presents a method of rapidly determining the values for missing parameters using appropriately scaled quantum chemical techniques.
π SIMILAR VOLUMES
Ab initio calculations have been carried out on s-trans-Nvinylmethyleneammonium, pyridinium, and related compounds to obtain rotational barriers, structures, and vibrational frequencies. The restricted Hartree-Fock (RHF) level of theory with 6-31G\*\* basis set was used for these calculations. In ad
## Abstract Highβlevel __ab initio__ calculations have been performed on __N__βmethylβ__N__βmethyleneammonium and related compounds to obtain accurate rotational barriers, structures, and vibrational frequencies. The 6β31G\*\* basis set has been utilized at the HartreeβFock level of theory for thes
With currently used definitions of out-of-plane angle and bond angle internal coordinates, Cartesian derivatives have singularities, at "r2 in the former case and in the latter. If either of these occur during molecular mechanics or dynamics simulations, the forces are not well defined. To avoid suc