Structure of the molecular complex of anthracene with 1,8:4,5-naphthalenetetracarboxylic dianhydride

C14H10.C14H4O6, M(r) = 446.42, monoclinic, P2(1)/a, a = 17.572 (10), b = 7.727 (4), c = 7.398 (4) A, beta = 101.90 (4) degrees, V = 982.9 (9) A3, Z = 2, Dx = 1.508 Mg m-3, lambda (Mo K alpha) = 0.71069 A, mu = 0.100 mm-1, F(000) = 460, T = 293 K, R = 0.050 for 1429 unique reflections with I > 3 sigma (I). The molecules stack with alternating rows of anthracene and dianhydride molecules. The two types of molecule do not lie parallel to each other in these stacks, possibly as a result of interactions between the peripheral H atoms of the anthracene and O atoms of the anhydride.