Abstract
JENSEN AND ASMUSSEN1 have recently made some interesting suggestions concerning the nature of the bridge links in polynuclear complex inorganic compounds, and one of the examples they discuss is iron enneacarbonyl, Fe2(CO)9. Now the X-ray evidence2 shows that the structure is essentially that shown in Fig. 1, in which a direct Fe-Fe link accounts for the observed interatomic distance and for the diamagnetism of the molecule. Without such a bond, each iron would be trivalent, with an effective atomic number of 35, as in the paramagnetic K3 [Fe(CN)6] and in the binuclear 1 : 10-phenanthroline iron (III) complex (Fig. 2),
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References
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EWENS, R. Constitution of Certain Binuclear Metallic Carbonyls and Nitrosyls. Nature 161, 530–531 (1948). https://doi.org/10.1038/161530a0
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DOI: https://doi.org/10.1038/161530a0
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