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The paramagnetic resonance method has been applied to investigate the magnetic pro perties of complexes containing elements of the 4d and 5d groups. It is shown that the resonance results, and such information as is available from susceptibility measurements, can be accounted for to a good approximation by assuming that there are either covalent cr-bonds or very strong electrostatic bonds in the complex (Van Vleck 1935). In the case of db complexes, however, accurate measurements of thedoi:10.1098/rspa.1953.0165 fatcat:bjxouyto5vfxnlc5tjfqhoayja