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Figure 2 π—π interactions of neighboring molecules and intramolecular hydrogen bonds in the crystal structure of (I).[symmetry code: (Cu1A) x, y − 1, z; (Cu1B) −x + 1, −y + 1, −z + 1; (Cu1D) −x + 1, −y + 2, −z + 1; (Cu2A) −x + 2, y − , −z + ; (Cu2B) −x + 2, y + , −z + ; (Cu2C) x, −y − , z + ; (Cu2D) x, −y + , z + ] |