Thermodynamics of metalorganic and elementoganic compounds: retrospective and perspective ideas

A. Baev1

1International Sacharov Ecological University, Belarus

Keywords: thermodynamics, elementorganic compounds, liquig structure, hybridisation
property: specific interaction, energies, pentacoordinated carbon
material: elementoorganic compounds

The results of our wide investigations of metal carbonyls were substantiated insolvency of this idea, but the study metal ceanes and acetylene alcohols shoed on absurdity idea of the dependency of evaporation enthalpy from molecular mass [1, 2]. From this point of view follows, that thermodynamic characteristics of sublimation and vaporization process are conditioned by bond vacancies, which are not mentioned and discussed. The author's contribution is consist, first, at the substantiation of chemical nature of a phase change [3] and, secondly, enthalpy and entropy of a phase change correlate with the number and the energy of brocks bonds, but high value of entropy vaporization, specifically, sublimation of Co2(CO)8 is accompanied by a process of molecular rearrangement with a change of M-CO-M on M-M bonds. This is allowed to examine of entropy as a structural characteristic [3]. This idea were substantiated on the base of fulfilled thermodynamic investigations of vaporization of organic, metalorganic, elementorganic compounds and is key position at worked theory of specific interaction of liquid alkyls with participation of carbon atom discussed at lecture. We are examined of the established the energies of these interactions which are changed from the value of H-bonds in liquid ammonia till for the same bonds in liquid water and exceeded it. Using the value of vaporization enthalpies, we determined the enthalpies formation of alkyls in gas phase and analyze of the regularities of them change and use for a correct estimate of dissociation energy of non studied alkyls. At lecture we are illustrated the lack of co-coordinated of thermodynamic properties of vaporation process of alkyls with the model sp3-hybridization. For correct interpretation of this problem it is necessary to push forward of new ideas. The author's contribution is consist at the decision of the present problem, moving forward the idea of a reverse dative bond at elementorganic compounds and substantiated it on the base of dissociation energies E-R, the influence of which prostrated on carbon atom of the end methyl group of ethyl and is completed on n-propel. This idea is confirmed be quantum-chemical calculations of electron configuration molecule of alkyl compounds, which showed, that the reverse dative bond exist and 2s2(c)-electron pair of carbon atom remind essential non divided, localized on carbon atom and have power no form specific interaction with participation of pentacoordinated carbon atom. At lecture we are discussed of worked out novel approaches of thermodynamic analysis of different class organic compounds for an establishment of a types bonds and a calculations of H-bond's energies and specific interactions and development of new ideas of chemistry liquid and soled state organic compounds and them solutions.

  1. A., I. Rusanov. Absract. XIV International Conference on Chemical Thermodynamics, (S Peterburg, Russia, 2002), p. 7

  2. A, A. Baev, A, K. Baev. Abstract. XVI International Conference on Chemical Thermodynamics.(Susdal, Russia, 2007), p. 682

  3. A, K, Baev. Structure and Energetic of Metal Carbonyls, (Minsk, Belarussia, 1986), p. 144

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