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1.  Crystal structure of dimethyl 3,3′-[(4-fluoro­phen­yl)methyl­ene]bis­(1H-indole-2-carboxyl­ate) 
In the title compound, the two indole ring systems are approximately perpendicular to one another, with a dihedral angle between their planes of 84.0 (5)°.
In the title compound, C27H21FN2O4, the mean planes of the indole ring systems (r.m.s. deviations = 0.0263 and 0.0160 Å) are approximately perpendic­ular to one another, making a dihedral angle of 84.0 (5)°; the fluoro­benzene ring is twisted with respect to the mean planes of the two indole ring systems at 89.5 (5) and 84.6 (3)°. In the crystal, pairs of N—H⋯O hydrogen bonds link the mol­ecules into inversion dimers, which are further linked by N—H⋯O hydrogen bonds into supra­molecular chains propagated along the b-axis direction. Weak C—H⋯π inter­actions are observed between neighbouring chains.
doi:10.1107/S205698901501628X
PMCID: PMC4647434  PMID: 26594391
crystal structure; MRI contrast agent; indole; bis-indolymethane; N—H⋯O hydrogen bonds; C—H⋯π inter­actions
2.  Crystal structure of dimethyl 3,3′-[(4-chloro­phen­yl)methyl­ene]bis­(1H-indole-2-carboxyl­ate) 
In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds, forming inversion dimers, which are linked by a further N—H⋯O hydrogen bond, forming chains along [100]. There are intra- and inter­molecular C—H⋯π inter­actions present, the latter linking the chains to form a three-dimensional supra­molecular structure.
In the title compound, C27H21ClN2O4, the mean planes of the two indole ring systems (r.m.s. deviations = 0.021 and 0.024 Å) are approximately perpendicular to one another, with a dihedral angle of 79.54 (12)°. The benzene ring is twisted with respect to the mean planes of the two indole ring systems at angles of 80.14 (15) and 86.30 (15)°. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds, forming inversion dimers with an R 2 2(18) ring motif. The dimers are linked by a further N—H⋯O hydrogen bond, forming chains along [100]. There are intra- and inter­molecular C—H⋯π inter­actions present, the latter linking the chains to form a three-dimensional supra­molecular structure.
doi:10.1107/S1600536814020686
PMCID: PMC4257187  PMID: 25484668
crystal structure; indole; bis-indolymethane; MRI contrast agent; N—H⋯O hydrogen bonds; C—H⋯π inter­actions
3.  N-[(2S)-2-Chloro­propano­yl]glycine 
The title compound, C5H8ClNO3, was prepared by the nucleophilic substitution reaction of (2S)-2-chloro­propanoyl chloride with glycine. The acetate group forms a dihedral angle of 84.6 (1)° with the mean plane of the C—NH—C=O fragment. In the crystal, the molecules are linked by N—H⋯O and O—H⋯O hydrogen bonds, generating a three-dimensional network, which consolidates the crystal packing.
doi:10.1107/S1600536812036720
PMCID: PMC3435838  PMID: 22969684

Results 1-3 (3)