title: Crystal structure of 3'-(1H-indole-3-carbon-yl)-1'-methyl-2-oxo-4'-(4-oxo-4H-chromen-3-yl)spiro-[indoline-3,2'-pyrrolidine]-3'-carbo-nitrile.
abstract: In the title compound, C31H22N4O4, the pyrrolidine ring adopts a twist conformation on the N-CH2 bond. The indolin-2-one and the 1H-indole rings are nearly planar (r.m.s. deviations = 0.06 and 0.011 Å, respectively) and are inclined to one another by 34.19 (9)°. The chromene ring system is also nearly planar (r.m.s. deviation = 0.029 Å). It is almost normal to the 1H-indole ring system, with a dihedral angle of 88.71 (8)°, and is inclined to the indolin-2-one ring system by 72.76 (8)°. In the crystal, mol-ecules are linked via N-H⋯O hydrogen bonds, forming slabs parallel to (10-1). The slabs are linked by C-H⋯O hydrogen bonds, forming a three-dimensional structure.
authors.affiliation: Department of Physics, Queen Mary's College (Autonomous), Chennai 600 004, India.
authors.forename: M P
authors.initials: MP
authors.lastname: Savithri
authors.affiliation: Department of Physics, Presidency College (Autonomous), Chennai 600 005, India.
authors.forename: R
authors.initials: R
authors.lastname: Raja
authors.affiliation: Industrial Chemistry Laboratory, Central Leather Research Institute, Adyar, Chennai 600 020, India.
authors.forename: D
authors.initials: D
authors.lastname: Kathirvelan
authors.affiliation: Industrial Chemistry Laboratory, Central Leather Research Institute, Adyar, Chennai 600 020, India.
authors.forename: B S R
authors.initials: BS
authors.lastname: Reddy
authors.affiliation: Department of Physics, Presidency College (Autonomous), Chennai 600 005, India ; Department of Physics, Queen Mary's College (Autonomous), Chennai 600 004, India.
authors.forename: A
authors.initials: A
authors.lastname: SubbiahPandi
keywords: carbo­nitrile; chromen; crystal structure; hydrogen bonding; indole; pyrrolidine; spiro