Structure of a 2,6-pyridinophane.

2,5,11,14-Tetraoxa-19,20-diazatricyclo-[13.3.1.1(6,10)] icosa-1(19),6,8,10(20),15,17-hexaene, C14H14N2O4, Mr = 274.3, monoclinic, P2(1)/c, a = 9.354(2), b = 9.011(3), c = 7.954(2) A, beta = 101.75(2) degrees, V = 656.4(6) A3, Z = 2, Dx = 1.388 g cm-3, lambda(Mo K alpha) = 0.71073 A, mu = 0.97 cm-1, F(000) = 288, T = 299 K, R = 0.035 for 834 observations with I greater than 3 sigma(I). The molecule lies on an inversion center and is in the anti or stepped conformation. The ethylene glycol chains are fully extended, and the two N-C-O-C torsion angles about the ring-O bonds are near zero, 1.6(2) and -2.3(2) degrees.