Abstract

From the temperature dependence study of halogen NQR frequencies, various structural phase transitions have been reported for methylammonium hexahalometallates (IV) and tetramethylammonium hexachlorometallates (IV). These phase transitions and also those of the related compounds are collected and discussed by referring to the results of 1H NMR and DTA measurements. We have studied several transition metal complexes, mainly copper (II) complexes, by NQR and found magnetic phase transitions from a paramagnetic to a magnetically ordered state, the existence of which has been confirmed by magnetic susceptibility measurements. These results are reviewed.

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