title: Structure of a photoresponsive crown ether, 21-(4'-methoxyphenylazo)-1,4,7,14,23-pentaoxa[7.2.2] orthometaorthobenzenophane.
abstract: 3,10,13,16,23-Pentaoxatetracyclo-[23.3.1.0.(4,9)0(17,22)]nonaco sa-1(29), 4,6,8,17,19,21,25,27-nonaene-29-azo-(4'-methoxybenzene), C31H30N2O6, Mr = 526, monoclinic, P2(1)/n, a = 14.564 (3), b = 19.177 (2), c = 10.025 (2) A, beta = 100.42 (1) degrees, V = 2754 (1) A3, Z = 4, Dx = 1.269 g cm-3, Mo K alpha, lambda = 0.71069 A, mu = 0.95 cm-1, F(000) = 1112, T = 293 K, final R = 0.050 for 2577 reflections with I greater than 3 sigma(I). The molecule resembles a butterfly with benzene rings for the wings and head. The transazobenzene moiety, which overlays one face of the crown oxygen ring, is in an orientation that creates a partial steric block to cation...crown complex formation.
authors.affiliation: Department of Chemistry and Biochemistry, University of Maryland, College Park 20742.
authors.forename: H L
authors.initials: HL
authors.lastname: Ammon
authors.forename: S
authors.initials: S
authors.lastname: Shinkai
mesh_terms: D004988:Ethers, Cyclic / Q000737:chemistry* / Q000528:radiation effects; D008958:Models, Molecular; D015394:Molecular Structure; D010777:Photochemistry; D014961:X-Ray Diffraction
chemical_list: D004988:Ethers, Cyclic; C069829:21-(4'-methoxyphenylazo)-1,4,7,14,23-pentaoxa(7.2.2)orthometaorthobenzenophane