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Figure 2 Six ferrocenylphosphonic acid molecules are connected by intermolecular O—H⋯O hydrogen bonds (dashed lines), forming a distorted octahedral cage. [Symmetry codes: (i) 1/3+y, 2/3-x+y, −1/3-z; (ii) 1/3+x-y, −1/3+x, −1/3-z; (iii) 3/4-x, 2/3-y, −1/3-z; (iv) 1-y, x-y, z; (v) 1-x+y, 1-x, z.] |