Zu Fragen der Polarität
It is proposed that an organic molecule can be characterised by a «property vector» of the following form: E = ( D P Ha/Hd Ea/Ed La/Ld) [sqrt(energy/mole)] (1) The terms of this vector show the ability of the molecule to attract other organic molecules: D: by dispersion forces and P: by the...
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| Format: | Article |
| Language: | deu |
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Swiss Chemical Society
1968-12-01
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| Series: | CHIMIA |
| Online Access: | https://www.chimia.ch/chimia/article/view/8725 |
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| _version_ | 1850140172771917824 |
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| author | E. sz. Kovats |
| author_facet | E. sz. Kovats |
| author_sort | E. sz. Kovats |
| collection | DOAJ |
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It is proposed that an organic molecule can be characterised by a «property vector» of the following form:
E = ( D P Ha/Hd Ea/Ed La/Ld) [sqrt(energy/mole)] (1)
The terms of this vector show the ability of the molecule to attract other organic molecules: D: by dispersion forces and P: by the inhomogeneity of its electrical field. The remaining terms symbolise properties in which forces between two molecules exist only if one of them is an acceptor, the other a donor: Ha/Hd: interaction by displacement of a nucleus of the donor towards the acceptor («hydrogen bridge»), Ea/Ed: by displacement of «one» electron in one molecule towards the other («charge transfer») and La/Ld: Lewis acid-base type interaction.
All terms beside D should be small and in any case not greatly exceed the magnitude of sqrt(RT). In this case a linear combination of the interaction forces (LCID) is admissible as approximation to calculate the resulting force as shown by the equations (2), (3), (4) and (5). Note that P is defined to represent an additional effect to D furthermore H, E and L represent additional effects over D + P.
Existing polarity scales are discussed in the light of the method of LCIF in a qualitative manner.
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| format | Article |
| id | doaj-art-7f0f4406e4b047e192d730b3f172c6bc |
| institution | OA Journals |
| issn | 0009-4293 2673-2424 |
| language | deu |
| publishDate | 1968-12-01 |
| publisher | Swiss Chemical Society |
| record_format | Article |
| series | CHIMIA |
| spelling | doaj-art-7f0f4406e4b047e192d730b3f172c6bc2025-08-20T02:29:55ZdeuSwiss Chemical SocietyCHIMIA0009-42932673-24241968-12-01221210.2533/chimia.1968.459Zu Fragen der PolaritätE. sz. Kovats0Institut de Chimie Physique, Ecole Polytechnique de l’Université de Lausanne It is proposed that an organic molecule can be characterised by a «property vector» of the following form: E = ( D P Ha/Hd Ea/Ed La/Ld) [sqrt(energy/mole)] (1) The terms of this vector show the ability of the molecule to attract other organic molecules: D: by dispersion forces and P: by the inhomogeneity of its electrical field. The remaining terms symbolise properties in which forces between two molecules exist only if one of them is an acceptor, the other a donor: Ha/Hd: interaction by displacement of a nucleus of the donor towards the acceptor («hydrogen bridge»), Ea/Ed: by displacement of «one» electron in one molecule towards the other («charge transfer») and La/Ld: Lewis acid-base type interaction. All terms beside D should be small and in any case not greatly exceed the magnitude of sqrt(RT). In this case a linear combination of the interaction forces (LCID) is admissible as approximation to calculate the resulting force as shown by the equations (2), (3), (4) and (5). Note that P is defined to represent an additional effect to D furthermore H, E and L represent additional effects over D + P. Existing polarity scales are discussed in the light of the method of LCIF in a qualitative manner. https://www.chimia.ch/chimia/article/view/8725 |
| spellingShingle | E. sz. Kovats Zu Fragen der Polarität CHIMIA |
| title | Zu Fragen der Polarität |
| title_full | Zu Fragen der Polarität |
| title_fullStr | Zu Fragen der Polarität |
| title_full_unstemmed | Zu Fragen der Polarität |
| title_short | Zu Fragen der Polarität |
| title_sort | zu fragen der polaritat |
| url | https://www.chimia.ch/chimia/article/view/8725 |
| work_keys_str_mv | AT eszkovats zufragenderpolaritat |