Ferroverdin, a green iron containing natural product, crystallizes in rhombohedral crystals which have the following composition Crystal data: Space group R3̄c; a = 16.06; c = 88.78; ρcalc = 1.446 for, as asymmetric unit, Fe/3.Na/3.C15H10NO4.CCl 4.CH3OH, M, 480. R = 16% on Weissenberg photographic data, eye estimated intensities. The iron nitrosophenyl complexes are linked together by sodium ions in double layers; each sodium ion contacts three carboxy oxygen atoms and three methanol oxygen atoms and the methanoloxygen atoms are hydrogen bonded to the phenolic oxygen atoms. The layers are stacked to enclose large cavities in each of which are sited six, partly disordered, carbon tetrachloride molecules.
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Sanctis et al. (1973) studied this question.