857.    EWENS, R. V. G.  Constitution of Certain Binuclear Metallic Carbonyls and Nitrosyls. Nature, vol. 161, 1948, pp. 530-531; Chem. Abs., vol. 42, 1948, p. 4484.

     Discussion of the resonance structure proposed by Jenson and Asmussen for Fe₂(CO)₉.  A covalent Fe-Fe link is preferred on the basis of X-ray and diamagnetic data, as well as color (see Powell and Ewens, abs. 2736).  Structures of a similar nature are proposed for Co₂(CO)₈, Fe nitrosyl compounds, Fe(NO)₂X, where X is SK, Cl, I, SC₂H₅, Sc₆H₅, or S₂O₃K.

                  ----------.  See abs. 2736.

      EWIG, K.  See abs. 3324.