Abstract
Structure, ultraviolet absorption spectrum, and stability of uranyl chelate compounds of o-, m-, and p-nitrodibenzoylmethane (I, II, and III) and m- and p-aminodibenzoylmethane (IV and V) were examined. It was found that the composition of such a chelate compound is made up of 2 moles of the β-diketone to 1 mole of uranyl and that (II) and (III) possess 1.5 moles of the water of crystallization while the others do not. These chelate compounds dissolve in organic solvents such as alcohols, ether, and pyridine. Absorption maximum in their ultraviolet spectrum, measured in ethanol solution, is at 390mμ (ε 12, 300) in (I), at 400mμ (ε 15, 000) in (II), at 406mμ (ε 16, 400) in (III), at 400mμ (ε 16, 400) in (IV), and at 410mμ (ε 30, 000) in (V). The value of ε tends to become larger as the absorption maximum shifts to a longer wave length range. The stability becomes greater in the order of (I), (III), (II), and (IV) is more labile than (II). Stability of (V) could not be determined.
