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K.KATZENELLENBOGEN, K. DOBKINER AND T. F. GALLAGHERVol. 74
inarily to Nujol absorption. There is marked similarity between the modifications of the same compound in the 3-5 micron region with noticeable difierences occurring among the skeletal frequencies, particularly in the range of 12.5 t o 14.5 microns. a-Copper phthalocyanine, when suspended in cyclohexanol, undergoes transition to the p-form. This was followed, a t room temperature, by the change iii infrared absorption as rccorded in Table I. ‘rA131,E 1 l i n e i:i minutes I /
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