Molecular structure dipole moment and

Krishnamurthy, V. N., and S. Soundararajan Charge distribution, dipole moment and molecular structure of Silyl Compounds. J. inorg. nuclear Chem. 27, 2341—2344 (1965). 

Some relationships between the dipole moment and molecular structure have also been found in the case of aliphatic compounds. In the first instance we may mention the two methyl esters of a- and 8-aminovaleric acid. We should expect from the results for the aminobenzoic acids that in an open chain the moment of the 8-ester would be greater than that of the a-ester, while in a chain joined into a ring the moments should be about the same. The values obtained... 

DIPOLE MOMENTS AND MOLECULAR STRUCTURE In a number of cases the magnitude of the dipole moment may be used to determine the geometrical configuration of the atoms in a molecule. Thus the first proof of the triangular structure of water arose from dipole moment measurements. Calculation may also be made of the valency angles from dipole moment data, but the values obtained are not as accurate as the more direct methods employing spectra, x-ray and electron diffraction measurements. However, for complex molecules when the application of more exact methods is not possible, the analysis of the dipole moment data may give valuable information. Thus the moment of thianthrene is 1-57, D,... 

Debye Petrus Josephus Wilhelmus (1884-1966) Dutch phys. chem., dipole moments and molecular structure, structure analysis of powdery crystals by means of X-ray difffaetion, study of polymers DellaGatta Giuseppe (1935—) Ital. calorim., authority in solution thermodynamics... 

Errera, J., Sherrill, M. L. (1929). Dipole moment and molecular constitution. In P. Debye (Ed.), Dipolmoment und Chemische Struktur [Dipole Moment and Chemical Structure], Leipzig Hirzel. 

Fig-9. EO coefficient data, as a function of chromophore number density, for CLD-type chromophores with (solid circles) and without (open triangles) isophorone protection of the polyene bridge. The maximum achievable electro-optic activity is smaller for the naked polyene bridge structure and the maximum of the curve is shifted to lower number density. The dipole moment and molecular first hyperpolarizability values are comparable (The unprotected polyene bridge variation may exhibit slightly higher values of p(3)... 

DIPOLE MOMENTS, AND MOLECULAR SPECTRA AS AIDS IN STRUCTURAL STUDIES... 

The chemistry of sulphur trioxide, to any large extent has not been studied in non-aqueous media. Compounds of sulphur trioxide with a few electron donors such as pyridine, dimethylamine, dimethylaniline, dioxane, acetic acid and butyric acid have been utilised for synthetic purposes without much attention having been paid to their structure and their solution chemistry. Based upon conductivity work the formation of compounds of sulphur trioxide with ethers (2) and fatty acids (3) has been briefly reported. These and other physicochemical studies such as potentiometric titrations, viscosity, density, dipole moment and molecular weight determinations have revealed in our work the formation of definite compounds of sulphur trioxide with alcohols, ethers, esters and fatty acids. 

Contributions in this section are important because they provide structural information (geometries, dipole moments, and rotational constants) of individual tautomers in the gas phase. The molecular structure and tautomer equilibrium of 1,2,3-triazole (20) has been determined by MW spectroscopy [88ACSA(A)500].This case is paradigmatic since it illustrates one of the limitations of this technique the sensitivity depends on the dipole moment and compounds without a permanent dipole are invisible for MW. In the case of 1,2,3-triazole, the dipole moments are 4.38 and 0.218 D for 20b and 20a, respectively. Hence the signals for 20a are very weak. Nevertheless, the relative abundance of the tautomers, estimated from intensity measurements, is 20b/20a 1 1000 at room temperature. The structural refinement of 20a was carried out based upon the electron diffraction data (Section V,D,4). 

On file other hand, this reaction is endothermic by almost 10 kJ mol-1 in file solid state. This is surprising because the monoamine has a nonzero dipole moment and a molecular structure that allows forformation of linear arrays of intermolecularly N H—C hydrogen-bonded molecules in the crystal, while file other species have zero dipoles and lack the possibility of such stabilization... 

Dipole Moment, Resonance and Molecular Structure. Frontiers in Chemistry S, 23. New York Interscience 1948-... 

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