Optical and X-ray data on a group of isostructural uranium and plutonium compounds

A group of isostructural compounds of hexavalent and tetravalent uranium and plutonium with tetraethyl and tetramethyl ammonium chloride (types----(R~N)2MC1 e and (R4N)2MO2C14) have been characterized by their optical properties and by X-ray diffraction analysis. Some errors in earlier data have been corrected and explained. The isostructuralism is maintained throughout the group, as evidenced by both crystal morphology and X-ray crystallography, although the space groups range from cubic to monoclinic. The monoclinic crystal has a fl angle of 90.0 .