Detection of charge-transfer complexes in solutions by the method of isosbestic points in the electronic absorption spectra: V. The scope and limitations of the method and some of its applications

✍ Scribed by Lech Skulski; Jolanta Małgorzata Kanabus; Zofia Stolarzowa; Stanisław Śliwiński

• Publisher: Elsevier Science
• Year: 1973
• Weight: 803 KB
• Volume: 5
• Category: Article
• ISSN: 0001-8716
• DOI: 10.1016/0001-8716(73)80015-x

✦ Synopsis

The detection of molecular charge-transfer complexes in solutions is also possible by locating the isosbestic points in a set of the uv-VIS absorption curves of three-component liquid equilibrating systems of the types (1): A+ D, +inert solvent (cyclohexane or Ccl,), or (2): A + D, + D, , where A represents an electron-accepting solute (its concentration cA is kept constant within each series of solutions investigated) dissolved in binary solvents made by mixing a liquid donor D, with the inert solvent or another liquid donor D, in a few varied proportions (by vol.). The scope and limitations of this method of isosbestic points are discussed and, subsequently, it is applied to discover the cause of the appearance of the so-called "anomalous dioxan effect" sometimes encountered in the dipole studies. The evidence given by the isosbestic points is that this effect is due to the donor-acceptor specific interaction in dioxan solutions.

* This paper also covers the most important of the results submitted in four preceding preliminary papers of this seriesrp4.