A Semi-Empirical Model of the Energy Barrier of Proton Transfer Reactions
โ Scribed by Alfred V. Willi
- Publisher
- John Wiley and Sons
- Year
- 1971
- Tongue
- German
- Weight
- 889 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
โฆ Synopsis
In the final structure about half the positive charge is located at the iron atom and the other half distributed uniformly over both rings (see table ). For comparison the charge at the iron atom in ferrocene is calculated to be + 0.3. This result compares favourably with Mossbawer experiments 1131. Another interesting result of these calculations is that a planar structure (111) should have a triplet groundstate (1.4 eV difference between highest occupied and lowest unoccupied MO) 1141 while the bent structure (V) should have a singlet ground state. Some experiments carried out by Cais et al. 1151 may be explained in this wap.
This work is p a r t of project No. SR 2.120.69 of t h e Schweizerzsche Satzolzalfonds. W e wish t o thank thc S A N D O Z AG for computer-time on the U N I V A C 1108. BIBLIOGRAPHY ! l j Reviews: (a) &I.
๐ SIMILAR VOLUMES
The Boys-Reeves Cl algorithm has been applied in a CNDO/?. framework to study the bonding in the cyclopropylmethyi cation. 1n:erpretive use is made of the fact that the CI algorithm is identical to a v;llence bond calculation except for the restriction to orthonormal one-electron orbit&. A pseudo-n
A simple model for the energy surface of a reacting system permits the calculation of the free energies of activation. A chemical reaction is analyzed in terms of the simple processes (bond making/breaking or atom transfer; geometry changes) which must take place to achieve the overall transformatio
Ah&art--A theory of the forward roll coating Row of Newtonian fluids has been developed recently by Greener and Middleman [I] utilizing the usual lubrication approximations and some very simple physical notions regarding the region in which the total flux through the nip splits into two films. These
## Abstract Proton transfer reactions were studied in all titratable pairs of amino acid side chains where, under physiologically reasonable conditions, one amino acid may function as a donor and the other one as an acceptor. Energy barriers for shifting the proton from donor to acceptor atom were