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The iodine coulometer consists of two platinum electrodes immersed in a potassium iodide solution. In order to prevent convection of the triiodide which forms at the anode, the lower half of the coulometer is filled with a more concentrated solution (ca. 1.0 M) than the upper half (ca. 0.1 M).After each electrolysis, the lower half of the solution is drained and titrated with a standard thiosulfate solution.Procedure and Results.-The apparatus is set up as shown in Fig. 1 and the reaction vessel is evacuated to a pressure of 1 µ.

By the use of single crystal and polycrystalline x-ray diffraction techniques, isomorphous orthorhombic lattices (space group No. 59) have been found in the Ru-B and Os-B systems having lattice parameters of a0=4.6443±0.0003 Å, b0=2.8668±0.0008 Å, c0=4.0449±0.0004 Å and a0=4.6832±0.0001 Å, b0=2.8717±0.0002 Å, c0=4.0761±0.0001 Å, respectively. The probable empirical formulas are RuB2 and OsB2, with two formula weights per unit cell.

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