| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1231458 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2013 | 4 Pages |
The formamide (FA)/pyridine (py)/pyridazine (prd) system was investigated by FT-Raman spectroscopy and the results in situ show that FA is preferentially bound to py, as experimentally pointed out by the proton affinity (PA) values of these azabenzenes. Temperature-dependent further investigations for the FA/prd mixture clearly show that the 2:1 FA:prd complex is more stable than the 1:1 FA:py adduct, even though its formation is influenced by the extremely negative entropy of the system, which becomes the spontaneously unfavorable global process. Linear relationships of the complex formation enthalpies (ΔH°) with band shifts (Δν) and dipole moments (μ) of these azabenzenes are observed and are in excellent agreement with our recent studies.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► An FT-Raman spectroscopic study of ternary and binary mixtures is presented. ► The basic strength of pyridine and pyridazine towards FA is evaluated in situ. ► Pyridine is the strongest base. ► The complex with pyridazine is the most stable. ► The negative entropy plays an important role.
