Abstract
Na2(Fe(CN)5(NO)).2H20, orthorhombic, Pnnm, a = 6.198 (2), b = 11.897 (5), c = 15.557 (5) ,/k, Z = 4, D e = 1.71 Mg m -3. The structure was refined to R~ = 0.045 for 1361 observed reflections, and is basically as described by Manoharan & Hamilton (Inorg. Chem. (1963). 2, 1043-1047). The (Fe(CN)5(NO)) 2- anion has effective 4mm symmetry, the Fe atom being displaced 0.183 (1) ./k out of the plane of the cis C atoms towards the NO. The cis Fe-C distances are 1.929 (4) and 1.936 (4) /k. The trans Fe-C distance, 1.918 (6)/k, is not significantly different from the cis distances. This is in contrast to other (M(CN)5(NO)) n- complexes where the trans M-C distances are longer than the cis M--C, and also to other (MLs(NO)) + complexes of Group VIII metals, where the trans M-L distances are shorter than the cis M-L. The Fe--N-O angle is 175.7 (5) ° and the Fe-N distance 1.653 (5)/k.
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