Magnetic Properties of Complexes of TCNQ with Arenchromium Compounds

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Abstract
The magnetic susceptibility and proton magnetic resonance spectra of complexes with composition (dibenzenchromium)+(TCNQ)+(I), (ditoluenchromium)+, TCNQ+(II), (dibenzenchromium)+(TCNQ)- 2(III), and (ditoluenchromium)+(TCNQ)- 2(IV) have been measured in the temperature range from 1.5 to 300°K. The magnetic susceptibility of complexes I and II at room temperature corresponds to the presence of one electron with S = 1/2 on a molecule of complex. The lack of the paramagnetic shifts of those nmr-lines which are due to the protons of TCNQ indicates that the paramagnetism of these complexes is connected solely with the unpaired spins of arenchromium cations. In complex I, the existence of two inequivalent groups of cations has been discovered, whereas in complex II, all cations are presumably equivalent. The temperature dependence of susceptibility of complexes III and IV testifies to the presence of small nearly temperature-independent contribution, typical for all highly conducting complexes of TCNQ and connected with the TCNQ-chains. The constants of hyperfine interaction between the unpaired electron and protons of arenchromiiim cations have been determined by combining the data on the temperature dependence of susceptibilities with the data on the paramagnetic shifts of nmr-lines.

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