metal-organic compounds
In ferrocene-1,1′-diylbis(diphenylmethanol)–4,4′-ethylenedipyridine (1/1), [Fe(C18H15O)2]·C12H12N2, there is an intramolecular O—HO hydrogen bond in the ferrocenediol component and a single O—HN hydrogen bond linking the two components into a finite monomeric adduct. Ferrocene-1,1′-diylbis(diphenylmethanol)–ethylenediamine (1/1), [Fe(C18H15O)2]·C2H8N2, crystallizes with Z′ = 2 in space group P, and there are two independent four-component aggregates in the structure, both of which are centrosymmetric. In the first type of aggregate, the molecular components are linked by O—HN and N—HO hydrogen bonds, in which both diamine N atoms participate; in the second type of aggregate, the diamine component is disordered over two sets of sites, but only one N atom is involved in the hydrogen bonding.
metal-organic compounds
In the title compound, [Na(C5H5N4O3)]·2H2O, each Na cation is linked to three C5H4N4O3− anions and two water molecules, forming approximately octahedral NaNO5 units; the cations and the anions form molecular ladders, and each ladder is linked to four neighbouring ladders by O—HO and O—HN hydrogen bonds.
metal-organic compounds
In the title compound, [Na(C2H3N2O3)], the Na+ cation lies on a centre of inversion in space group P21/m and all the atoms of the anion lie on a mirror plane. Na is octahedrally coordinated by four O and two N atoms from six different anions and each anion is coordinated to six different Na+ cations, forming chains of confacial octahedra which link the anion layers. Within these layers, the individual anions are linked by both O-HO and C-HO hydrogen bonds.
organic compounds
In the triclinic polymorph of 2-iodo-4-nitroaniline, C6H5IN2O2, space group P, the molecules are linked by paired N-HO hydrogen bonds into C(8)[R(6)] chains of rings. These chains are linked into sheets by nitroI interactions, and the sheets are pairwise linked by aromatic --stacking interactions. In the orthorhombic polymorph, space group Pbca, the molecules are linked by single N-HO hydrogen bonds into spiral C(8) chains; the chains are linked by nitroO interactions into sheets, each of which is linked to its two immediate neighbours by aromatic --stacking interactions, so producing a continuous three-dimensional structure.
organic compounds
Molecules of the title compound, C12H10N2O2, are markedly non-planar. There is an intramolecular N-HO hydrogen bond, and the molecules are linked into zigzag chains by a single C-HO hydrogen bond. Comparisons are made with the supramolecular aggregation in isomeric amino-nitro derivatives, and in some N-methylnitroanilines.
organic compounds
Molecules of the title compound, C10H20N2O8, adopt a conformation which is almost centrosymmetric. The molecules are disordered over two sets of sites with an occupancy ratio of 0.94:0.06. In the major form, there are two intramolecular O—HO hydrogen bonds [OO 2.756 (4) and 2.765 (4) Å; O—HO 144 and 146°], in which the two amidic O atoms act as acceptors. In addition, there are four intermolecular O—HO hydrogen bonds [OO 2.650 (3)–2.666 (3) Å; O—HO 158–171°]; these link each molecule to six others in a continuous sheet structure which contains five distinct ring motifs, two of the S(7) type, two of the R(10) type and one of the R(22) type.
organic compounds
In the title compound, C6H16N22+·2C2H4O5P-, the cations lie across centres of inversion; in the anions, two of the H-atom sites have 0.50 occupancy. The anions are linked by short O-HO hydrogen bonds [OO 2.465 (3)-2.612 (3) Å and O-HO 165-171°] into sheets of alternating R(12) and R(28) rings, both of which are centrosymmetric; the cations lie at the centres of the larger rings linked to the anion sheet by N-HO hydrogen bonds [NO 2.642 (2) Å and N-HO 176°].
organic compounds
In the title compound, C4H12N22+·2C8H7O3-·2CH4O, the cations lie across centres of inversion and are disordered over two orientations with equal occupancy; there are equal numbers of (R)- and (S)-mandelate anions present (mandelate is -hydroxybenzeneacetate). The anions and the neutral water molecules are linked by O-HO hydrogen bonds [OO 2.658 (3) and 2.682 (3) Å, and O-HO 176 and 166°] into deeply folded zigzag chains. Each orientation of the cation forms two symmetry-related two-centre N-HO hydrogen bonds [NO 2.588 (4) and 2.678 (4) Å, and N-HO 177 and 171°] and two asymmetric, but planar, three-centre N-H(O)2 hydrogen bonds [NO 2.686 (4)-3.137 (4) Å and N-HO 137-147°], and by means of these the cations link the anion/water chains into bilayers.