Abstract
Measurements have been made of the optical and electrical properties of single crystals of tri‐p‐methoxy phenyl methyl perchlorate and triphenyl methyl azide. These include the absorption spectra, photoconduction behavior, low‐frequency dielectric constants, and refractive indices. In the case of tri‐p‐methoxy phenyl methyl perchlorate where the electron affinity of the acid radical is high the solid is ionic and an estimate has been made of the energy required to raise an electron from the full band to the conduction band. The properties of triphenyl methyl azide are consistent with a covalent type solid. The stability of these compounds is considered in outline.

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