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Citation: SI Wei-Jiang, ZHUO Chu-Ping. Additivity of Group Contribution of Electron Correlation Energies in Linear Alkyl Fluorides[J]. Acta Physico-Chimica Sinica, ;2009, 25(06): 1131-1135. doi: 10.3866/PKU.WHXB20090610 shu

Additivity of Group Contribution of Electron Correlation Energies in Linear Alkyl Fluorides

1.
School of Chemical Engineering, Shandong University of Technology, Zibo 255049, Shandong Province, P. R. China

Received Date: 14 December 2008
Available Online: 31 March 2009

Correlation energy contributions of the —CH3, —CH2— and —F functional groups in linear alkyl fluorides CH3(CH2)mF (m=0-5) were calculated and studied at MP2-OPT2/6-311++G(d) level using Meld program. We found that with an increase in the number of intervening methylene groups in the studied systems, values of Ecorr(—F) and Ecorr(—CH3) decreased in the CH3(CH2)mF (m=0-5) series. Values of Ecorr(—CH2—) are different in different positions with respect to the —F group in the system. The value of Ecorr (—CH2—) for the α position is larger than the values for methylene groups in other positions within the same system. The farther the —CH2— is from the —F group in the molecule, the smaller the value of Ecorr(—CH2—) is in CH3(CH2)mF (m=1-5) systems. We predict that with an increase in the number m in the system, values of Ecorr (—CH2—), which are those of—CH2—groups relatively far fromthe terminal —F group, would converge to the value of a“standard”—CH2—group. This Ecorr(—CH2—) value is transferable between CH3(CH2)mF homolo us systems. Results for CH3(CH2)mF (m=2-5) systems from Meld program at MP2-OPT2/6-311++G(d) level and results for CH3(CH2)mF (m=2-10) systems from Gaussian 98 program at MP2/6-311++G(d)//HF/6-311++G(d) level showthat the total correlation energy is a linear function of (m-1), where m is the number of methylene groups in the system.
- Correlation energy contribution,
- Additivity of group contribution,
- Linear alkyl fluoride
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