Competition between H路路路蟺 and H路路路O Interactions in Furan Heterodimers

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• 作者：Elsa S谩nchez-Garc铆a ; Georg Jansen
• 刊名：The Journal of Physical Chemistry A
• 出版年：2012
• 出版时间：June 14, 2012
• 年：2012
• 卷：116
• 期：23
• 页码：5689-5697
• 全文大小：384K
• 年卷期：v.116,no.23(June 14, 2012)
• ISSN：1520-5215

文摘

Here the interactions of furan with HZ (Z = CCH, CCF, CN, Cl, and F) are studied using a variety of electron correlation methods (MP2, CCSD(T), DFT-SAPT) and correlation-consistent triple- and quadruple-味 basis sets including complete basis set (CBS) extrapolation. For Fu鈥揌F all methods agree that a n-type structure with a hydrogen bridge between the oxygen lone-pair of furan and the hydrogen atom of HF is the global minimum structure. It is found to be significantly more stable than a 蟺-type structure where the hydrogen atom of HF points toward the 蟺 system of furan. For the other four dimers MP2 and DFT-SAPT predict the 蟺-type structure to be somewhat more stable, while CCSD(T) favors the n-type structure as the global minimum for Fu鈥揌Cl and predicts both structures as nearly isoenergetic for Fu鈥揌CCH and Fu鈥揌CCF. From a geometrical point of view, the Fu鈥揌CN dimer structures are more related to those of the Fu鈥揌Cl complex than to Fu鈥揌CCH. The different behavior of HCCF and HF upon complexation with furan evidence the effect of the presence of a 蟺 system in the aggregation of fluorine derivatives. It is shown that aggregates of furan cannot be understood by means of dipole鈥揹ipole and electrostatic analysis only. Yet, through a combined and detailed analysis of DFT-SAPT energy contributions and resonance effects on the molecular charge distributions a consistent explanation of the aggregation of furan with both 蟺 electron rich molecules and halogen hydrides is provided.