Abstract
Abstract A colorless crystalline complex of allyl alcohol with copper(I) chloride, (CH2=CHCH2OH)-CuCl, was synthesized at room temperature in a vacuum system. A similar complex with calcium chloride was also prepared for the sake of comparison. The equilibrium vapor pressure of the copper (I) chloride complex was determined at vairous temperatures, and ΔH=−12.0 kcal/mol was obtained as the heat of formation from solid copper (I) chloride and gaseous allyl alcohol. The C=C stretching frequency of allyl alcohol is shifted by 95 cm−1 to the lower frequency side by ligation to copper (I). The C–O stretching band shows a very minor shift of 15 cm−1. This value is almost the same as in the calcium chloride complex. Thus, in the copper (I) chloride complex, allyl alcohol coordinates to the metal mainly through the double bond, but the OH group also participates in the coordination. By measuring the decrease in vapor pressure, copper(I) chloride was found to exist as a dimer in allyl alcohol at 23–43°C, but as a monomer at 97°C.
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