In the title compound, (C(3)H(5)N(2))[Co(C(4)H(5)NO(4))(2)], the cation and anion are located on a twofold rotation axis and inversion center, respectively. Inter-molecular N-H⋯O hydrogen bonds link the cations and anions into layers parallel to the ab plane. The crystal packing also exhibits weak C-H⋯O hydrogen bonds, including bifurcated hydrogen bonds, and C=O⋯π inter-actions.

Many studies of protein-RNA complexes focus on protein instead of RNA or both, and often ignore water-mediated protein-RNA complexes despite their abundant existence. The primary focus of our study is to find interaction propensities not only for proteins but also for RNAs. This paper presents the analysis of 952 hydrogen bonds in the most representative set of protein-RNA complexes, including ...

In the title hydrated mol-ecular salt, C(6)H(7)ClN(+)·C(2)HO(4) (-)·0.5H(2)O, the water O atom lies on a crystallographic twofold axis. In the crystal, the anions are linked by O-H⋯O hydrogen bonds, forming chains propagating along the b axis. These chains are inter-connected through O-H⋯O hydrogen bonds from the water mol-ecules and N-H⋯O hydrogen bonds from the cations, building layers parall...

In the title compound, C(11)H(14)BrN(2) (+)·NO(3) (-), inter-molecular N-H⋯O and N-H⋯N hydrogen bonds link the proton-ated 5-bromo-gramine cation and the nitrate anions. Further N-H⋯O hydrogen bonds link the cation-anion pairs into a chain running parallel to [100]. C-H⋯O hydrogen bonds link the chains, forming a layer parallel to (001).

In the title compound, C(10)H(10)N(4)O(4), the two imidazole rings adopt a trans conformation and are inclined to one another at a dihedral angle of 55.64 (4)°. In the crystal structure, mol-ecules are linked by inter-molecular O-H⋯N hydrogen bonds into chains running parallel to [010] and layers are formed from these by inter-molecular C-H⋯O hydrogen bonds. Additional C-H⋯O hydrogen bonds prod...

In the title compound, C(11)H(9)F(2)N(5)OS, the pyrazole ring forms a dihedral angle of 16.42 (6)° with the benzene ring. Intra-molecular N-H⋯O hydrogen bonds generate two S(6) ring motifs. In the crystal, an R(2) (2)(8) ring motif is formed by a pair of inter-molecular N-H⋯S hydrogen bonds. Inter-molecular C-H⋯F hydrogen bonds further link the mol-ecules into a three-dimensional network.

In the title compound, C7H12N2OS, the 2-sulfanylideneimidazolidin-4-one moiety is nearly planar, with a maximum deviation of 0.054 (2) Å. In the crystal, a pair of N-H⋯O hydrogen bonds and a pair of N-H⋯S hydrogen bonds each form a centrosymmetric ring with an R 2 (2)(8) graph-set motif. The enanti-omeric R and S mol-ecules are alternately linked into a tape along [1-10] via these pairs of hydr...

In the title mol-ecule, C17H12F2O3, the dihedral angle between the benzene rings is 8.6 (2)°. In the crystal, two pairs of O-H⋯O hydrogen bonds connect the mol-ecules into inversion dimers. In addition, weak C-H⋯F hydrogen bonds link the dimers into a two-dimensional network parallel to (10-4). The carbonyl O atom is an acceptor for two weak intra-molecular hydrogen bonds.

In the title mol-ecule, C(22)H(20)N(2)O(4), the dihedral angles between the benzimidazole ring system and the benzene rings are 44.26 (2) and 82.91 (2)°. Intra-molecular O-H⋯O hydrogen bonds occur. In the crystal, O-H⋯N and O-H⋯O hydrogen bonds connect the mol-ecules into a two-dimension network parallel to (10[Formula: see text]) and weak inter-molecular C-H⋯O hydrogen bonds complete the forma...

In the title complex, [Ba(C10H12N5O6)2(H2O)6]n, the Ba atom is nine-coordinated by six water ligands and three carboxylate O atoms. The Ba2+ cations and the anionic glutamate ligands form coordination polymer chains, and these chains are linked by pairs of N-H...O hydrogen bonds and pairs of O-H...O hydrogen bonds to form a continuous three-dimensional framework of cations and anions, which is ...