Thermodynamics of the formation of complexes between aniline derivatives and proton acceptors in solution

✍ Scribed by V.E. Borisenko; D.S. Kuzmin; A.V. Morev; A. Koll

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 584 KB
• Volume: 88
• Category: Article
• ISSN: 0167-7322
• DOI: 10.1016/s0167-7322(00)00144-6

✦ Synopsis

The M (°~, lVl ~u ~md 2(Ma)) la spectral moments of the v(NH) bands of aniline derivatives as well as their complexes with various proton acceptors in solution were determined in the temperature range 285-330K. Studied compounds were: aniline; 4-metoxytetrafluoraniline; 2,3,5,6-tetrafluoraniline and 4-aminotetrafluorpyfidine. The coefficients of linear Y=aT+b regression of the spectral moments M {°~, lVl ~t) and 2(M~2)) ~a with temperature were determined for the free amino groups as well as for 1:1 complexes with various proton acceptors in CCh solutions. An analysis of the influence of temperature on the spectral characteristics of monomers and their 1:1 complexes with various proton acceptors was performed.

The heat formation (AH 0 of the 1:1 complexes with proton acceptors was determined using the dependence of the equilibrium constants on temperature.

On the basis of the "rule of intensity": -AH = --AR m, the AH2 for the complexes of 1:2 stoichiometry was calculated, allowing the estimation of the relation AH~/AH2