Abstract
Solvent 1H nuclear magnetic relaxation dispersion (NMRD) between 0.01 and 100 MHz of solutions containing a square pyramidal copper(II) complex in water and ethyleneglycol have been measured between 5 and 39°C. The data have been interpreted in terms of decreasing rotational correlation time with decreasing temperature and upon passing from water to ethyleneglycol; simultaneously the metal nucleus-unpaired electron hyperfine coupling becomes increasingly significant. The NMRD data of the copper derivative of a protein of MW 30000 in water at 25°C are similar to those of the small complex in ethyleneglycol at somewhat lower temperatures. A fitting of the data with the available theory is presented.
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