title: 2,3,5,6-Tetrakis[3,5-bis(trifluoromethyl)phenoxy]-2,5-bis(dimethylamino)2,3,5,6-tetrabora-1,4-dioxane diethyl ether 0.667-solvate.
abstract: The title compound, C(36)H(26)B(4)F(24)N(2)O(6).0.667C(4)H(10)O, has centrosymmetric tetraboradioxane molecules, half each of three of these comprising the asymmetric unit together with a molecule of diethyl ether. Disorder affects most of the CF(3) groups and one ethyl group of the solvent molecule. The B(4)O(2) rings are approximately planar and contain two B atoms with trigonal geometry and two with distorted tetrahedral geometry, the B-O bonds for the four-coordinate B atoms being longer than those for the three-coordinate B atoms. N-H...O hydrogen bonds link two of the crystallographically independent molecules together in chains, while the third molecule forms discrete trimolecular clusters with two solvent molecules via N-H...O hydrogen bonds. This is the first crystallographically characterized example of a tetrabora-dioxane molecule containing both four- and three-coordinate B atoms.
authors.affiliation: School of Natural Sciences (Chemistry), Newcastle University, Newcastle upon Tyne NE1 7RU, England. w.clegg@ncl.ac.uk
authors.forename: William
authors.initials: W
authors.lastname: Clegg
authors.forename: Todd B
authors.initials: TB
authors.lastname: Marder
authors.forename: Sylvain
authors.initials: S
authors.lastname: Nlate
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Scott