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1.  N-(6-Bromo­meth­yl-2-pyrid­yl)acetamide 
The title acetamide compound, C8H9BrN2O, crystallizes with three crystallographically independent mol­ecules (A, B and C) in the asymmetric unit. In mol­ecule A, the mean plane through the acetamide unit is inclined at a dihedral angle of 4.40 (11)° with respect to the pyridine ring [10.31 (12) and 2.27 (11)°, respectively, for mol­ecules B and C]. In the crystal structure, mol­ecules are inter­connected into sheets parallel to the ac plane by N—H⋯O, C—H⋯Br, C—H⋯O and C—H⋯N hydrogen bonds. The structure is further stabilized by weak inter­molecular C—H⋯π inter­actions.
doi:10.1107/S1600536810035026
PMCID: PMC2983235  PMID: 21587497
2.  N-(6-{2-[6-(2,2-Dimethyl­propanamido)-2-pyrid­yl]eth­yl}-2-pyrid­yl)-2,2-dimethyl­propanamide 
The title compound, C22H30N4O2, lies about a crystallographic inversion center. The whole mol­ecule is disordered over two positions with a refined occupancy ratio of 0.636 (10):0.364 (10). The pyridine rings are approximately planar, with maximum deviations of 0.033 (10) and 0.063 (17) Å for the major and minor components, respectively. The mean planes of the pyridine rings form dihedral angles of 17 (2)° in the major component and 18 (2)° in the minor component with the respective formamide groups attached to them. In the crystal packing, inter­molecular N—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules into two-dimensional networks parallel to the ab plane.
doi:10.1107/S1600536810023068
PMCID: PMC3007361  PMID: 21588283
3.  Quinoxaline-2-carbonitrile 
In the title compound, C9H5N3, the quinoxaline ring is essentially planar, with a maximum deviation of 0.012 (1) Å. Short inter­molecular distances between the centroids of the 2,3-dihydro­pyrazine and benzene rings [3.6490 (5) Å] indicate the existence of π⋯π inter­actions. In the crystal packing, the mol­ecules are linked via two pairs of inter­molecular C—H⋯N inter­actions, forming R 2 2 (8) and R 2 2 (10) ring motifs; these mol­ecules are further linked into a two-dimensional network parallel to (1 0 2) via another C–H⋯N inter­action.
doi:10.1107/S1600536809051289
PMCID: PMC2980041  PMID: 21580135
4.  2,7-Dimethyl-1,8-naphthyridine 
The asymmetric unit of the title compound, C10H10N2, contains one half-mol­ecule with the two shared C atoms lying on a twofold rotation axis. The 1,8-naphthyridine is almost planar with a dihedral angle of 0.42 (3)° between the fused pyridine rings. In the crystal, mol­ecules are linked into infinite chains along the c axis by inter­molecular C—H⋯N hydrogen bonds, generating R 2 2(8) ring motifs. In addition, the crystal structure is further stabilized by C—H⋯π inter­actions.
doi:10.1107/S1600536809024350
PMCID: PMC2977386  PMID: 21583458
5.  7-(2,2-Dimethylpropanamido)-2-methyl-1,8-naphthyridin-1-ium chloride monohydrate 
The asymmetric unit of the title compound, C14H18N3O+·Cl−·H2O, comprises a substituted amido–naphthyridine cation, a chloride anion and a water mol­ecule of crystallization. Intra­molecular C—H⋯O hydrogen bonds generate six-membered rings, producing an S(6) ring motif. The amido group is twisted from the naphthyridine ring, making a dihedral angle of 17.65 (7)°. The crystal structure is stabilized by inter­molecular N—H⋯O, N—H⋯Cl, O—H⋯Cl (× 2), and C—H⋯O (× 2) hydrogen bonds. These inter­actions linked neighbouring mol­ecules into chains along the a and b axes of the crystal, thus forming mol­ecular sheets parallel to the (001) plane.
doi:10.1107/S1600536808042955
PMCID: PMC2968242  PMID: 21581941

Results 1-5 (5)