𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Scaled quantum mechanical study of vibrational force field for p-difluorobenzene and p-fluorotoluene

✍ Scribed by Andrzej A. Jarzęcki; Ernest R. Davidson; Quan Ju; Charles S. Parmenter


Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
248 KB
Volume
72
Category
Article
ISSN
0020-7608

No coin nor oath required. For personal study only.

✦ Synopsis


The ground-state geometries, scaled quantum mechanical SQM quadratic force field, and infrared and Raman intensities of p-difluorobenzene and p-fluorotoluene have been determined from density functional theory, using the B3-LYP hybrid functional and the 6-31G U basis set. Based on these calculations, one b mode of 2 u p-difluorobenzene is reassigned. Possible reassignments of a few other, less certain, experimental bands are proposed.


📜 SIMILAR VOLUMES


Raman spectrum of coronene: a scaled qua
✍ Ulrich Fleischer; Peter Pulay 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 272 KB 👁 1 views

The Raman spectrum of coronene was calculated using the scaled quantum mechanical force Ðeld approach, based on density functional calculations at the B3LYP/6-31G\* level. This procedure applied to benzene reproduces the position of the gas phase fundamentals with 7 cm-1 absolute mean deviation. Sem

Density functional theory studies on mol
✍ Ying Xue; Daiqian Xie; Guosen Yan 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 439 KB 👁 2 views

Density functional theory with the combined Becke's three-parameter exchange functional in combination with the Lee, Yang, and Parr correlation functional (B3LYP) exchange-correlation energy functions using the 6-31G \* basis set was applied to study the structures and vibrational infrared (IR) spec

Derivation of class II force fields: V.
✍ Maple, J. R.; Hwang, M.-J.; Jalkanen, K. J.; Stockfisch, T. P.; Hagler, A. T. 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 403 KB 👁 1 views

V these coupling and anharmonic contributions. Both force field representations are assessed in terms of their ability to fit the observables. They have also been tested by calculating the properties of 11 stationary states of these amide molecules. Optimized structures, vibrational frequencies, and

A density functional theory-derived forc
✍ H. Gallouj; P. Lagant; G. Vergoten 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 256 KB 👁 2 views

The vibrational wavenumbers of 3-ethylindole were obtained from ab initio studies based on the density functional theory (DFT) approach. The assignments of the theoretical wavenumbers obtained after scaling of the internal force constants were compared with those of skatole and tryptophan. To check

A force field derived by density functio
✍ H. Gallouj; P. Lagant; G. Vergoten 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 238 KB 👁 2 views

The vibrational wavenumbers of 4-ethylimidazole were obtained from ab initio studies based on the density functional theory approach. The assignments of the theoretical wavenumbers obtained after scaling of the internal force constants were performed by comparison with the observed Raman and infrare