In the title compound, C(9)H(11)N(3)O, the crystal structure is stabilized by a bifurcated inter-molecular N-H⋯(N,O) hydrogen bond and a C-H⋯O inter-action, leading to chains of mol-ecules.

FTIR spectroscopic study of hydrogen bonding of 1,2-dihydroxybenzene (catechol) with proton acceptors has been carried out. The influence of intramolecular and intermolecular hydrogen bonds on the strengths of each other in complexes of 1,2-dihydroxybenzene with various proton acceptors has been analyzed. It was shown that intramolecular hydrogen bond is strengthened when 1,2-dihydroxybenzene i...

The cysteine anion was produced in the gas phase by electrospray ionization and investigated by photoelectron spectroscopy at low temperature (70 K). The cysteine anion was found to exhibit the thiolate form [-SCH2CH(NH2)CO2H], rather than the expected carboxylate form [HSCH2CH(NH2)CO2-]. This observation was confirmed by two control experiments, that is, methyl cysteine [CH3SCH2CH(NH2)CO2-] an...

A hydrogen bond for a local-minimum-energy structure can be identified according to the definition of the International Union of Pure and Applied Chemistry (IUPAC recommendation 2011) or by finding a special bond critical point on the density map of the structure in the framework of the atoms-in-molecules theory. Nonetheless, a given structural conformation may be simply favored by electrostati...

The structural, vibrational, and energetic properties of adducts of alkanes and strong cationic proton donors were studied with composite ab initio calculations. Hydrogen bonding in D-H(+)...H-alkyl adducts contributes to a significant degree to the interactions between the two components, which is substantiated by NBO and AIM results. The hydrogen bonds manifest themselves in the same manner a...

In the title compound, C(15)H(13)NO(4)·H(2)O, the Schiff base exists in a zwitterionic form and a bifurcated intra-molecular N-H⋯(O,O) hydrogen bond generates two S(6) rings. The dihedral angle between the two benzene rings is 25.8 (2)°. The crystal structure is stabilized by inter-molecular O-H⋯O hydrogen bonds.

In the title mol-ecular salt, C12H24N(+)·NO3 (-), the cyclohexyl rings adopt chair conformations with the exocyclic C-N bonds in equatorial orientations. In the crystal, a bifurcated N-H⋯(O,O) hydrogen bond links the cation to the anion; the ion pairs are linked via C-H⋯O hydrogen bonds, forming layers in the ac plane.

In the the title compound, C(6)H(5)BrN(2)O, an intra-molecular N-H⋯N hydrogen bond generates an S(5) ring. In the crystal structure, inter-molecular bifurcated N-H⋯(O,O) hydrogen bonds link the mol-ecules, leading to sheets propagating in (100).

In the crystal structure of the title compound, C(16)H(14)O(6)·H(2)O, the dihedral angle between the benzene rings is 60.8 (3)°. Mol-ecules are linked through a bifurcated O-H⋯O hydrogen bond, forming a zigzag chain along the b axis. The chains are further linked by O-H⋯O hydrogen bonds mediated by water mol-ecules.

In the crystal structure of the title compound, C(4)H(10)NO(+)·C(6)HCl(2)O(4) (-)·CH(4)O, the components are held together by bifurcated O-H⋯(O,O), O-H⋯(O,Cl) and N-H⋯(O,O) hydrogen bonds into a centrosymmetric 2+2+2 aggregate. The aggregates are further connected by another bifurcated N-H⋯(O, O) hydrogen bond, forming a double-tape structure along the b axis. A weak C-H⋯O inter-action is obser...