Communications to the Editor 3133 (10) An approximate covalent radius of Fe(0) pertinent to the present situation is taken as one half of the average Fe-Fe distance in the triply bridged compounds Fe2(CO)9 (2.523 (1) A)11 and NaHFe2(CO)8 (2.521 (1) A).12 An appropriate value for silver is the Pauling tetrahedral radius of 1.44 A.
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