(3Z)-3-[(Z)-2-(2-Oxoindolin-3-ylidene)hydrazin-1-ylidene]indolin-2-one 0.17-hydrate

In the title compound, C16H10N4O2·0.17H2O, prepared by the one-step condensation reaction of isatin with hydrazine hydrate under microwave irradiation, the complete organic molecule is generated by crystallographic inversion symmetry and therefore exists in an S-trans conformation. In the crystal, molecules are linked by N—H⋯O hydrogen bonds, generating a three-dimensional framework with [001] channels, which are occupied by the disordered water molecules.

In the title compound, C 16 H 10 N 4 O 2 Á0.17H 2 O, prepared by the one-step condensation reaction of isatin with hydrazine hydrate under microwave irradiation, the complete organic molecule is generated by crystallographic inversion symmetry and therefore exists in an S-trans conformation. In the crystal, molecules are linked by N-HÁ Á ÁO hydrogen bonds, generating a three-dimensional framework with [001] channels, which are occupied by the disordered water molecules.
Data collection: SMART (Bruker, 2002); cell refinement: SAINT (Bruker, 2002); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXTL (Sheldrick, 2008). Microwave irradiated and solvent-free synthesis have aroused great attention in recent years due to rapid, convenient, green, environment friendly, inexpensive and efficient (Hoz et al., 2004;Jagani et al., 2012). As a continuation of our research work on Schiff bases (Liu et al., 2008;Wang et al.,2010), we report here one step synthesis of the title compound under microwave irradiated and free-solvent condition, which was prepared by two steps in the normal method (Ali & Alam, 1994), and its structure.
In the central symmetric molecule of the compound, the non-hydrogen atoms are conjugated by a couple of double bonds of C7=N2 and C7a=N2a, because whose bond length [1.2891 (17) Table 1).
In its pack structure there are two couples of N1-H1···O1 inter-molecular hydrogen bonds in the neighbor molecules which link many molecules into three dimensional net-work frames, and the disorder water molecules merge into the network (Fig. 2, Table 1). Thus the guest molecules of the water and the host molecules of the compound form into a supermolecular net-work structure.

Refinement
After their location in a difference map, all H atoms were fixed geometrically at ideal positions and allowed to ride on the  The molecular structure of the title compound, showing 30% probability ellipsoids.  where P = (F o 2 + 2F c 2 )/3 (Δ/σ) max < 0.001 Δρ max = 0.25 e Å −3 Δρ min = −0.18 e Å −3 Special details Experimental. The title compound was synthesized under microwave irradiation. Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.  (7) 0.0372 (7) 0.0217 (6) 0.0112 (6) 0.0069 (6)  C3 0.0532 (9) 0.0532 (9) 0.0516 (9) 0.0291 (8) 0.0181 (7) 0.0037 (7)  C4 0.0582 (9) 0.0549 (9) 0.0574 (10) 0.0388 (8) 0.0097 (7) 0.0033 (7)  C5 0.0547 (9) 0.0410 (7) 0.0422 (8) 0.0287 (7) 0.0055 (6) 0.0060 (6) (2)