Potentiometric titration studies involving ternary complexes of Cu(II)-bipy, Co(II)-bipy and Ni(II)-

A yellow zone on the column was removed by elution with benzene-alcohol, and a crystalline yellow product obtained after concentrating the solution gave on sublimation 240 mg. of material, m. p. 167-168.5°, and 70 mg., m. p. 160-165°. The total product was converted to the trinitrobenzene derivative, which crystallized from benzene-alcohol in bright orange needles, m. p. 239-240°. Decomposition of the derivative in benzene-alcohol with stannous chloride and hydrochloric acid afforded colorless plates. On recrystallization from alcohol 250 mg. (26%) of colorless blades were obtained, m.

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