Abstract

The title compound 5'-chloro-5,5''-difluoro-1H,1''H-[3,3':3',3''-terindol]-2'(1'H)-one synthesized via one-pot multicomponent reaction
(MCR) at room temperature using commercially available sulfamic acid as inexpensive and environmentally benign organo-catalyst. It
crystallizes in the monoclinic space group P21 with the unit-cell parameters: a= 10.193(5), b= 9.012(5), c= 13.406(5) Å, β = 102.767(5)o
and Z = 2. The crystal structure was solved by direct methods using single-crystal X-ray diffraction data collected at room temperature and
refined by full-matrix least-squares procedures to a final R-value of 0.0390 for 1972 observed reflections. The molecules within the unit
cell are stabilized by N-H..O and C-H..F type of hydrogen bonding. The sulfur atom of DMSO solvent molecule is found disordered over
two set of sites S100 and S200 with occupancy ratio 0.70:0.30.

Key words: Crystal structure, Direct methods, Hydrogen bond