Search

The article presents information on the structure of the third form of vitamin B1, C12H18N4OS2+∙2Cl-&3x2219;H2O. Thiamine is a coenzyme in a number of important metabolic processes, such as the decarboxylation of α-keto acids and the transfer of aldehyde or acyl groups. In the study, the H atoms were located in a difference map, leading to a better understanding of the hydrogen-bonding pattern in vitamin B1. In the third form of vitamin B1 the planes of the pyrimidine and thiazolium rings are at a dihedral angle of 79 (15)°.

In the title compound, 2C7H7NO2·C6H5NO2, the 4-amino­benzoic acid and the nicotinic acid mol­ecules are approximately planar. The crystal structure is stabilized by an extensive network of N—H⋯O, O—H⋯O and O—H⋯N hydrogen bonds. [ABSTRACT FROM AUTHOR]

The title compound, C7H7NO3S, is a simple new pyridylthio- N-oxide of pharmacological inter­est. There are two independent mol­ecules in the asymmetric unit. Strong O—H⋯O hydrogen-bond inter­actions link the mol­ecules in ribbons lying in the (101) plane. [ABSTRACT FROM AUTHOR]

In the title compound, [Ag(NO3)(C15H18N6)], the AgI atom is four-coordinated by the three N atoms of the 2-aminopyridine ligands and by an O atom of the nitro group. The structure is stabilized by an extensive network of N—H—O and N—H—N hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title compound, C6H6NO2+·NO3−·H2O, the nicotinium cation is essentially planar. N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules into layers parallel to the (10 ) plane. [ABSTRACT FROM AUTHOR]

In the crystal structure of the title compound, (C5H7N2)2[CoCl4], the CoII ion is coordinated by four chloride ions. The Co atom lies on a crystallographic twofold rotation axis. The structure is stabilized by an extensive network of N—H⋯Cl hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the structure of the title compound, 2C5H7N2+·SO42−, the S atom of the sulfate anion lies on a twofold axis. The structure is stabilized by an extensive network of N—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title compound, C5H7N2+·C7H4NO4−, the asymmetric unit consists of an aminopyridinium cation and a p-nitro­benzoate anion, with proton transfer occurring to the aromatic N atom of the 2-amino­pyridine molecule. In the crystal structure, the two ions are inter­connected by N—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title compound, [Mn(H2O)6](C7H6NO3S)2, the pyridylsulfanyl N-oxide acetate anions have no direct coordination to the MnII atom. The MnII atom is octa­hedrally coordinated by six water mol­ecules and is located on an inversion centre. The cations and anions are linked by O—H⋯O hydrogen bonds into a three-dimensional network. [ABSTRACT FROM AUTHOR]