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Figure 2 The crystal packing of (I). In this figure, three building units of (I) are shown on the left of the panel, which are joined together on the right along the [011] direction through hydrogen bonds with the connecting pieces (detached on the box). Hydrogen bonds are shown as dashed lines. [Symmetry codes: (a) (i) x, −y + , z − ; (ii) x + , y + , −z + ; (iii) x + , −y + 2, −z + 1; (iv) x + 1, −y + , z − ; (v) x − , −y + 1, −z + 1; (vi) x + , y − , −z + ; (b) (i) x, y + 1, z; (ii) −x + 1, −y + 1, −z + 1; (iii) −x, −y, −z + 1; (iv) −x + 1, −y, −z; (v) −x, −y + 1, −z + 1; (vi) x − 1, y, z; (vii) x − 1, y + 1, z + 1]. |