GUANYLALKYLUREAS AND THEIR METALLIC COMPLEXES. PART VII. CUANYLcycloHEXYLUREA

Guaylcyclohexylurea and its complex with copper(11), nickel(II), and palladium(II) have been prepared and their properties studied. The complexes are all of the bis-guanylurea type and have the usual colour: copper (rese-red), nickel (yellow to orange). and palladium (pale cream). The copper complex is paramagnetic (\(\mu\)eff = 1.87 B.M.) whereas the nickel and palladium complexes are diamagnetic- The rose-red copper complex (\(\lambda\)max 530-540 m\(\mu\)) changes in solution at pH 4 to the blue-coloured monoguanylurea complex (\(\lambda\)max 660 m\(\mu\) ) It has not been possible, however, to isolate the blue-coloured complex in the pure state.