(3Z)-5-Chloro-3-(hydroxyimino)indolin-2-one

What is it about?

In the title compound, C8H5ClN2O2 (common name: 5-chloro­isatin 3-oxime), the mol­ecular structure deviates slightly from the ideal planarity, with a maximum deviation of 0.0478 (8) Å for the non-H atoms. In the crystal, mol­ecules are linked by N-H...O inter­actions, building centrosymmetric dimers with graph-set motif R22(8). Additionally, the mol­ecules are connected by pairs of O-H...O inter­actions into chains along [100] with a C(6) motif. The hydrogen-bonded dimers and chains build a two-dimensional network parallel to (100). The packing also features [pi]-[pi] stacking inter­actions between benzene rings [centroid-centroid distance = 3.748 (2) Å].

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