RESUMO
There are two independent mol-ecules in the asymmetric unit of the title compound, C10H8INO2, which differ in the degree of planarity. The iodo-indoline-2,3-dione skeleton of mol-ecule 1 is essentially planar [mean deviation = 0.003â (2)â Å for the nine non-H atoms of the indoline core, with a maximum deviation of 0.033â (1)â Å for the I atom]. The I atom and O atom in the 3-position of mol-ecule 2 deviate by 0.195â (1) and 0.120â (2)â Å, respectively, from the least-squares plane through the nine non-H atoms of the indoline core. Mol-ecules 1 and 2 are roughly coplanar, the mean planes through their cores making a dihedral angle of 6.84â (1)°. This coplanarity results in a layer-like structure parallel to (6,11,17) in the crystal, the distance between adjacent least-squares planes through the cores of mol-ecules 1 and 2 being 3.37â (1)â Å. In such a layer, mol-ecules 1 and 2 are linked by C-Hâ¯O hydrogen bonds, forming chains along [11-1]. The chains are further coupled to construct a kind of double-chain structure via Iâ¯O inter-actions [3.270â (2)â Å].