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Hexa­methyl­ene­tetr­amine, C6H12N4, and ferrocene­carboxyl­ic acid, C11H10FeO2, form a 1:2 adduct, (I), which is a salt, viz. hexa­methyl­ene­tetramin­ium(2+) bis(ferro­cene­car­box­yl­ate), (C6H14N4)[Fe(C5H5)(C6H4O2)]2. The dication in (I) is disordered with two orientations at a site of mm2 symmetry in space group Fmm2, while the anion lies across a mirror plane with its unsubstituted cyclo­penta­dienyl ring disordered over two sets of sites. With ferrocene-1,1'-di­carboxyl­ic acid, C12H10FeO4, hexa­methyl­enetetr­amine forms a 1:1 adduct, (II), in which both components are neutral, viz. hexa­methyl­ene­tetramine-ferro­cene-1,1'-di­car­box­ylic acid (1/1), [Fe(C6H5O2)2]·C6H12N4. The amine component in (II) is disordered with two orientations at a site of mm2 symmetry in space group Cmcm, while the acid component is disordered with two orientations at a site of 2/m symmetry. The components in (I) are linked into a finite three-ion aggregate by a single N-H...O hydrogen bond, while the components of (II) are linked into continuous chains by a single O-H...N hydrogen bond.
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