Reversibly dimerizes at 193 K, and is observed as the blue color of paramagnetic dramatically shifts to the red-brown color of diamagnetic, together with a drop in paramagnetic susceptibility and electrical conductivity when the solution is cooled to below 193 K:
2.
In 1995, James H . Prestegard and coworkers demonstrated that NMR spectra of certain proteins ( in this case cyanometmyoglobin, which has a very highly anisotropic paramagnetic susceptibility ), taken at very high field, may contain data that can usefully complement NOEs in determining a tertiary fold.
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