The melting points of oligomethylenes
β Scribed by Ton That Minh Tan; Bernd Michael Rode
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 358 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0887-6266
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β¦ Synopsis
Quantitative structure-property relationships (QSPR) between the melting points of oligomethylenes and quantum chemical data calculated by the semiempirical method CNDO/ 2 were investigated. A linear relationship between the average net charges of hydrogen and carbon atoms in the molecules and the melting points could he established, achieving good fit as well as predictability. Further, the relation between the net charges and the chain length was evaluated. The evaluated net charges of polyethylene lead to a calculated melting point of 141.4OC (experimental: 141.4'C).
π SIMILAR VOLUMES
The generally higher melting-point of a para-disubstituted benzene relative to the corresponding metaisomer has been ascribed to the fact that, being more symmetrical, it can pack more tightly. Exceptionally, it was observed that whereas m-anisylpinacolone melts at 58.0 Β°C, the para-isomer melts low