Showing papers on "Valency published in 1973"
TL;DR: In this article, the density matrix results of CNDO self-consistent field molecular orbital calculations are correlated with chemists' ideas of valency, and both the valencies of atoms and the anisotropy of an atom in a given environment are derived quantitatively.
Abstract: Theory is developed to enable the density matrix results of CNDO self-consistent field molecular orbital calculations to be correlated with chemists' ideas of ‘valency.’ Both the valencies of atoms and the anisotropy of an atom in a given environment are derived quantitatively. Examples chosen from carbon, nitrogen, and borane chemistry yield results which are gratifyingly consistent with the chemistry of the system.
145 citations
TL;DR: In this article, the dependence of total π-electron energy, πelectron charge distribution and free valency indices of conjugated hydrocarbons on molecular topology was investigated.
67 citations
57 citations
TL;DR: With the aid of infrared spectroscopy, it was shown that the bismuth ions in BaBiO 3 are equivalent and that the charge distribution Ba 2 Bi 3+ Bi 5+ O 6 is incorrect as mentioned in this paper.
40 citations
TL;DR: In this article, the molecular structure of 1,2-difluoroethane in the gas phase has been determined by electron diffraction at room temperature, only the gauche conformation was found, the dihedral angle F −C-C-F is 74.5°.
36 citations
TL;DR: The molecular structure of meta-difluorobenzene in the gas phase has been determined by electron diffraction at room temperature as discussed by the authors, and the carbon ring deviates slightly from D6h symmetry.
23 citations
TL;DR: Partially oxidized tin(II) niobate and tantalate pyrochlores are homogeneous cubic phases as mentioned in this paper, and they have been shown by Mossbauer 119Sn spectroscopy to contain both Sn(II and Sn(IV).
Abstract: Partially oxidized tin(II) niobate and tantalate pyrochlores are homogeneous cubic phases. They have been shown by Mossbauer 119Sn spectroscopy to contain both Sn(II) and Sn(IV). Each valency state...
23 citations
TL;DR: The effective masses of charge carriers in Mo1−xTaxSe2 alloys are close to m 0.12 · 10−2, indicating that holes generated as a result of alloying with tantalum are located in the valency zone as mentioned in this paper.
Abstract: 1.
Ta in MoSe2 acts as an acceptor impurity, and alloying with it sharply increases the electrical conductivity of the compound.
2.
At x=0.12 · 10−2, the compound Mo1−xTaxSe2 is a nondegenerate semiconductor; compounds with x≥ 0.56 · 10−2 must be classed as semimetals.
3.
The effective masses of charge carriers in Mo1−xTaxSe2 alloys are close to m0. This indicates that holes generated as a result of alloying with tantalum are located in the valency zone (Fig. 1b).
2 citations