Wydział Chemii

K. S. Rutkowski

S. M. Melikova

R. E. Asfin

Bogusława Czarnik-Matusewicz

Maria Rospenk

2014

Journal of Molecular Structure

1072

32-37

10.1016/j.molstruc.2013.12.014

Naukowa

Angielski

Artykuł

An infrared and ab initio (MP2/6-311++G(2d,2p)) study of complexes of chloroform (Cl₃CH(D)) and halothane (CHClBrCF₃) with weak - methyl fluoride (FCD₃) and strong - trimethylamine (N(CH(D)₃)₃tbnd TMA) proton acceptors in the gas phase near the room temperature is presented. The so called blue shifting hydrogen bond has been identified in the former case and the formation of conventional H-bond with the red frequency shift of CH stretching vibration of the proton donors was observed in the latter case. An attempt of temperature spectroscopic measurements has been made for the systems studied to estimate the formation energy. In the case of Cl₃CD…N(CH₃)₃ complex this value equals -23(2) kJ/mol. The results obtained in ab inito calculations generally agree with those obtained in IR spectroscopic measurements, however they overestimate the frequency shift caused by the complex formation, especially in the case of the red-shifting H-bonds. Possible origin of such overestimation is discussed shortly.

CH donors, Trimethylamine, Methyl fluoride, H-bond, The gas phase, ab initio calculations

http://dx.doi.org/10.1016/j.molstruc.2013.12.014

http://www.elsevier.com