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The Zero Point of the Acidity Function Scale 827 but the saturated structure of all five carbonyl groups is attained not by all five sharing uniformly with the iron atom, but by four sharing, as in the Fe(CO)4~ion, and the fifth bridging across two of the four. Similarly chromium hexa-carbonyl9 and molybdenum hexacarbonyl have two such bridges.Cobalt trinitrosyl, Co(NO)3, predicted by Reiff on the basis of the effective atomic number, should not be capable of existence if the symmetry of four groups attached to the central atom is an essential part of the stability of the electron distribution. Indeed, Blanchard, Rafter (9) Windsor has just determined the vapor density of chromium hexacarbonyl, and found that it corresponds to that of the single molecule Cr(CO)e [This Journal, 56, 823 (1934)]. and Adams16 failed completely to obtain such a substance under conditions that produced the nitrosyl tricarbonyl freely.

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