Remarques sur le calcul des énergies de liaison

✍ Scribed by Wladimir Lasareff

• Publisher: Elsevier Science
• Year: 1936
• Weight: 162 KB
• Volume: 3
• Category: Article
• ISSN: 0031-8914
• DOI: 10.1016/s0031-8914(36)80207-9

✦ Synopsis

S u m m a r y

Recent investigations on the dissociation energy of CO impose the values L0 = 108 or 124 kcal. for the energy of the transition Caiam. C(3P)gas at 0°K. The average bond energy Ec--c in aliphatic hydrocarbons CnH2n+2, calculated by a thermodynamic cycle on the basis of L0 = 108 or 124 kcal., becomes 51 or 59 kcal., --if no correction SA is applied representing the energy difference between the electronic state of carbon atoms in such molecules a s _ C n H 2 n + 2 a n d the normal 3p state of isolated C atoms. These values for Ec--c are appreciably less than those indicated by the available experimental data giving Ec--c > 7 0 kcal. Consequently, there is strong evidence for the necessity of introducing the correction term SA in the thermodynamic cycle starting from the equation: CnH2n+2 -+ n . C + (2n + 2 ) . H .

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