The reaction of AlMe with 1,3_diphenyltriazene [Hdpt] in toluene gives Al(dpt)3, even when AlMe, is in large excess. The monomeric structure has been established by Xray diffraction. Crystals of Al(dpt)3 are monoclinic, space group C2/c with a = 20.587(3), b = 16.005(3), c = 13.236(3) 8, and b = 119.172(12)", Z = 4, R = 0.067 and R, = 0.083. The aluminium(II1) is coordinated by three chelating triazenido ligands to give a trigonally distorted octahedral geometry. The gallium and indium analogues are also reported.

The solubilities of cesium metaperiodate in aqueous solutions of pH 1.3-5.8 have been measured a t 5.0, 25.0, and 40.0". The values calculated for K,,O a t these temperatures were (3.96 =IC 0.17) X(2.24 4 0.07) X 10-3, and (6.53 & 0.04) X 10-3. Evidence was found for a new periodate phase in the system H~O-CSIOC-CSOH, and two previously unreported cesium periodate salts were prepared.The equilibrium constant Kdo and thermodynamic quantities for the reaction HaIOs-(aq) e IO4-(aq) + 2H20(1) have been determined in the temperature range 2-18" by means of a nuclear magnetic resonance technique. The extrapolated value of KdO a t 25' was found to be 29. The corresponding vnltte of AG,!" wts -2 . 0 2~ 0.1 kcal/mole, of AHd" was 14.8 + 1.1 kcal/mole, and of 4.S,io was 50 f 4 eu.At2S0, AGsolno = 1.91 =! = 0.05 kcal/mole, AHSoino = 13.1 kcal/mole, and ASsolno = 37.6 eu.

The phosphenium ion

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