title: Synthesis, characterization, and crystal structure of a new trisodium triborate, Na(3)[B(3)O(4)(OH)(4)].
abstract: The preparation of a new trisodium triborate, Na(3)[B(3)O(4)(OH)(4)], and its complete characterization in terms of molecular structure and thermal behavior are reported. Synthesis of this compound was achieved either by NaBH(4) hydrolysis or by thermal treatment of Na[B(OH)(4)].2H(2)O. The crystal structure was determined by single-crystal X-ray diffraction. The trisodium triborate crystallized in the monoclinic system (a = 12.8274(6) A, b = 7.7276(4) A, c = 6.9690(3) A, and beta = 98.161(3) degrees ), space group Cc, Z = 2. The structure of Na(3)[B(3)O(4)(OH)(4)] comprised [B(3)O(4)(OH)(4)](3-) polyanions, based on B-O-containing rings with two tetracoordinated boron atoms and one tricoordinated boron atom in the fragments BO(2)(OH)(2) and BO(3), respectively. These polyanions are interconnected by four intermolecular hydrogen bonds and presented a tilt of 10.470(4) degrees compared to the a axis. Thus, they are stacked by rotation of about 180 degrees around an axis defined by the three-coordinated boron atoms and parallel to the c axis. Such polyanions were only observed previously in two synthetic compounds, M(3)[B(3)O(4)(OH)(4)].2H(2)O with M = K and Rb, which were isostructural. The originality of the present work was the synthesis and the description of a different crystallographic structure containing this polyanion. Characteristic peaks ranging from 500 to 1500 cm(-1) and around 3300 cm(-1) highlighted the presence of the B-O rings and hydroxyl groups, respectively. The decomposition temperature T = 155 degrees C was obtained by thermogravimetric analysis, and the following equivalent formula in terms of hydration degree was proposed: NaBO(2).(2)/(3)H(2)O. Na(3)[B(3)O(4)(OH)(4)] decomposed into Na(3)[B(3)O(5)(OH)(2)] in equilibrium with its vapor.
authors.affiliation: Laboratoire des Multimatériaux et Interfaces, Université Lyon 1, Villeurbanne, CNRS, UMR 5615, Université de Lyon, F-69622, Lyon, France.
authors.forename: Jérôme
authors.initials: J
authors.lastname: Andrieux
authors.forename: Christelle
authors.initials: C
authors.lastname: Goutaudier
authors.forename: Laetitia
authors.initials: L
authors.lastname: Laversenne
authors.forename: Erwann
authors.initials: E
authors.lastname: Jeanneau
authors.forename: Philippe
authors.initials: P
authors.lastname: Miele
mesh_terms: D001881:Borates / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008958:Models, Molecular; D015394:Molecular Structure; D012964:Sodium / Q000737:chemistry*
chemical_list: D001881:Borates; D012964:Sodium