Multiple-wavelength data treatment of ultraviolet—visible spectra for 1:1 electron donor—acceptor adducts of p-nitrophenol in heptane
✍ Scribed by Satoshi Kusakabe; Mami Ohara
- Book ID
- 102981176
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 681 KB
- Volume
- 242
- Category
- Article
- ISSN
- 0003-2670
No coin nor oath required. For personal study only.
✦ Synopsis
The absorbances of solutions of p-nitrophenol and an electron donor in heptane are measured at 298 K over 240-400 MI at l-run intervals. The data are treated by a personal computer; on each spectrum, the differences between the measured absorbance and the absorbance calculated from an assumed formation constant are accumulated over the whole wavelength region, and divided by a normalizing factor which is obtained from the area under the measured spectrum.
The optimal values of the constant for each spectrum are then averaged.
The 1: 1 adduct formation constants, log K,,, were 2.22 f 0.17 for 4-methyl-2-pentanone, 3.95 * 0.06 for N,N-dimethylacetamide, and 5.55 f 0.13 for trioctylphosphine oxide. The method is applicable for various systems with this kind of equilibrium and has advantages over least-squares procedures.