Synthesis and crystal structure of ULM-16, a new open framework fluorinated gallium phosphate with 16-ring channels
- Univ. du Maine, Le Mans (France). Lab. des Fluorures
The synthesis and characterization of ULM-16, a new fluorinated gallophosphate Ga{sub 4}(PO{sub 4})F{sub 2} {center_dot} 1.5 NC{sub 6}H{sub 14} {center_dot} 0.5 H{sub 2}O {center_dot} 0.5 H{sub 3}O, is described. This material is hydrothermally prepared at 180 C using cyclohexylamine as the structuring agent. It crystallizes in the orthorhombic space group Pbcn (n{degree} 60) with a = 27.329(4) {angstrom}, b = 17.377(2) {angstrom}, c = 10.2124(5) {angstrom}, V = 4,849.6 (9) {angstrom}{sup 3} and Z = 8. The structure is built up from vertex-linked GaO{sub 4} and PO{sub 4} tetrahedra, GaO{sub 4}F trigonal bipyramids and GaO{sub 4}F{sub 2} octahedra forming hexameric units and infinite double crankshaft chains (called cc or UUDD). The hexameric unit is similar to that found in ULM-3, ULM-4, ULM-5 and ULM-8. The two types of building units are fully connected by vertex-sharing with respect to a strict Ga-P alternation. The 3-D framework consists of cylindrical tunnels delimited by sixteen and six polyhedra running along [001]. The cyclohexylamine molecules are trapped in the wider pores and interact with the bridging fluorine atoms and hydration water through hydrogen bonds. The ULM-16 topology is closely related to that of ULM-5 where, in ULM-16, the infinite crankshaft chains replace the isolated D4R cages of ULM-5. TGA curve (under argon) indicates that the ULM-16 structure is intact up to 800 C. Structural relationships will be stated explicitly for the different structures of the ULM-n series containing the hexameric units.
- OSTI ID:
- 462719
- Report Number(s):
- CONF-960401-; ISBN 1-55899-334-7; TRN: IM9719%%189
- Resource Relation:
- Conference: Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 8-12 Apr 1996; Other Information: PBD: 1996; Related Information: Is Part Of Microporous and macroporous materials; Lobo, R.F. [ed.] [Univ. of Delaware, Newark, DE (United States)]; Beck, J.S. [ed.] [Mobil Technology Co., Paulsboro, NJ (United States)]; Suib, S.L. [ed.] [Univ. of Connecticut, Storrs, CT (United States)]; Corbin, D.R. [ed.] [E.I. Dupont de Nemours and Co., Wilmington, DE (United States)]; Davis, M.E. [ed.] [California Inst. of Tech., Pasadena, CA (United States)]; Iton, L.E. [ed.] [Argonne National Lab., IL (United States)]; Zones, S.I. [ed.] [Chevron Research and Technology Co., Richmond, CA (United States)]; PB: 566 p.; Materials Research Society symposium proceedings, Volume 431
- Country of Publication:
- United States
- Language:
- English
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