1973 Volume 46 Issue 1 Pages 166-169
The ultraviolet spectrum of Ni(acac)2 in dichloromethane shows two maxima, at 265 and at 300 nm. The intensity ratio of these two bands is very sensitive to the water content of the solvent, the high-energy band decreasing and the low-energy band increasing with the water content. It is thus suggested that the trimeric Ni(acac)2might have only one absorption band, at 265 nm, in dichloromethane completely free from donor impurities. The UV spectrum of Ni(acac)2 in dichloromethane changes with time due to the hydrolytic reaction. Even in the solvent containing 4.54×10−3M water, acetylacetone was freed from the complex in the yield of 34.4% after 48 hours’ standing. A minute amount of the residual complex was isolated; its tetrameric structure is suggested on the basis of its UV spectrum in methanol.
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