Untersuchungen an Molekülkomplexen—II. Spektroskopische Untersuchungen über die Bestimmung von Monomer-Dimer-Aautoassoziationskonstanten von Thionyl-seleninyl- und Phosphorylverbindungen

Abstract

Four methods are given for the determination of self association constants from i.r. spectra showing strong overlap of monomer and dimer absorption. Two methods involve the mathematical separation of only few spectra. This gives the band parameters and integrated intensities which are used for simplified separation of all other spectra measured over the concentration range. The third method is a least squares computation and the fourth is a computer simulated difference spectroscopy method. As an example the experimental data of SeOCl2 are used to check the different methods. The self association constants in diluted CS2-solution of the compounds CH3SOCl, (CH3)2SO, SeOCl2, CF3SeOCl, CH3POCl2 are given and discussed due to their correlation with the valence force constants of the element oxygen bonds.