C-Methyl-calix[4]resorcinarene-1,4-bis-(pyridin-3-yl)-2,3-diaza-1,3-butadiene (1/2).

In the title compound, 2C(12)H(10)N(4)·C(32)H(32)O(8), the calixarene adopts a rctt conformation with dihedral angles of 138.40 (1) and 9.10 (1)° between the opposite rings. The dihedral angles between the rings of the pyridine derivative are 8.80 (1) and 9.20 (1)°. In the crystal, adjacent C-methylcalix[4]resorcinarene molecules are connected into columns parallel to [010] by O-H⋯O hydrogen bonds. O-H⋯N hydrogen bonds between the axial phenoxyl groups and bipyridine molecules link the columns into sheets parallel to (011), which are connected by O-H⋯N hydrogen bonds. Further O-H⋯N hydrogen bonds link the bipyridine and C-methylcalix[4]resorcinarene molecules, giving rise to a three-dimensional network.