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author:("akba, tufa")
1.  4-Meth­oxy-N-[(E)-(5-nitro­thio­phen-2-yl)methyl­idene]aniline 
The title mol­ecule, C12H10N2O3S, is nonplanar with an inter­planar angle of 33.44 (7)° between the benzene and thio­phene rings. In the crystal there exist only weak inter­molecular C—H⋯O inter­actions, π–π inter­actions between the benzene rings [centroid–centroid distance = 3.7465 (14) Å] and X—Y⋯π inter­actions to the thio­phene and benzene rings [N⋯centroid distances = 3.718 (3) and 3.355 (3) Å, respectively]. Inter­molecular C—H⋯O inter­actions link the mol­ecules into chains parallel to the a axis.
doi:10.1107/S1600536812034344
PMCID: PMC3470380  PMID: 23125793
2.  (E)-1-[(3-Iodo­phen­yl)imino­meth­yl]naphthalen-2-ol 
In the title mol­ecule, C17H12INO, the dihedral angle between the naphthaldeyde plane and the 3-iodo­aniline plane is20.07 (13)°. It exists in the solid state as an enol–imine tautomer with a strong intra­molecular O—H⋯N hydrogen bond.
doi:10.1107/S1600536812036793
PMCID: PMC3470381  PMID: 23125794
3.  (E)-1-[(3-Bromo­phen­yl)imino­meth­yl]naphthalen-2-ol 
The title compound, C17H12BrNO, exists in an enol–imine form and the mol­ecular structure features an intra­molecular O—H⋯N hydrogen bond. The dihedral angle between the benzene ring and the naphthalene ring system is 17.27 (15)°.
doi:10.1107/S1600536812034824
PMCID: PMC3435811  PMID: 22969657
4.  (Z)-3-Meth­oxy-N-[(5-nitro­thio­phen-2-yl)methyl­idene]aniline 
In the title compound, C12H10N2O3S, the dihedral angle between the benzene and thio­phene rings is 43.17 (4)°. The crystal structure is devoid of any hydrogen-bonding inter­actions. However, π–π inter­actions between the benzene and thio­phene rings [distance between ring centroids = 3.6850 (11) Å] stack the mol­ecules along the a axis. The absolute structure could not be determined as the crystal studied was a racemic twin with a BASF parameter of 0.31 (6).
doi:10.1107/S1600536812033120
PMCID: PMC3435696  PMID: 22969567

Results 1-4 (4)