Refinement. R[F 2 >2(F 2 )] = wr(f 2 ) = S = reflections 155 parameters 10 restraints

Transcription

1 inorganic compounds Acta Crystallographica Section E Structure Reports Online ISSN Terbium(III) hydrogendiphosphate(v) tetrahydrate Refinement R[F 2 >2(F 2 )] = wr(f 2 ) = S = reflections 155 parameters 10 restraints Table 1 Selected bond lengths (Å). H atoms treated by a mixture of independent and constrained refinement max = 0.29 e Å 3 min = 0.21 e Å 3 Karla Fejfarová, a Rachid Essehli, b Brahim El Bali b and Michal Dušek a * a Institute of Physics, Na Slovance 2, Praha 8, Czech Republic, and b Department of Chemistry, Faculty of Sciences, University Mohammed 1st, PO Box 524, Oujda, Morocco Correspondence fejfarov@fzu.cz Tb1 O (17) Tb1 O2 i (17) Tb1 O3 ii (18) Tb1 O (18) Tb1 O6 iii (17) Tb1 O (2) Tb1 O (2) Tb1 O (2) P1 O (18) P1 O (18) P1 O (19) P1 O (18) P2 O (2) P2 O (19) P2 O (18) P2 O (18) Symmetry codes: (i) x þ 1; y; z; (ii) x þ 1; y þ 1; z þ 2; (iii) x þ 3 2 ; y 1 2 ; z þ 3 2. Received 19 December 2007; accepted 18 January 2008 Key indicators: single-crystal X-ray study; T = 295 K; mean (P O) = Å; R factor = 0.012; wr factor = 0.034; data-to-parameter ratio = The Tb atom of the title compound, TbHP 2 O 7 4H 2 O, is coordinated by the O atoms of three symmetrically independent water molecules and by five O atoms belonging to HP 2 O 7 groups. The TbO 8 polyhedra are interconnected by the diphospate anions, forming a three-dimensional network which is additionally stabilized by O HO hydrogen bonding between water molecules and O atoms of the HP 2 O 7 anions. Uncoordinated water molecules are situated in channels and are connected via hydrogen bonds with the framework. Related literature Isostructural compounds of the type REHP 2 O 7 4H 2 O were reported for RE = Sm by Chehimi-Moumen et al. (2002), for RE = Gd by Hraiech et al. (2005) and for RE = Eu by Anna- Rabah et al. (2006). Table 2 Hydrogen-bond geometry (Å, ). D HA D H HA DA D HA O4 H41O (13) (14) (3) 174 (3) O8 H81O1 ii 0.82 (2) 1.98 (3) (3) 159 (3) O8 H82O3 i (18) (14) (3) 150 (3) O9 H91O4 iv 0.83 (3) 2.06 (3) (3) 161 (3) O9 H92O8 iii (18) 1.95 (2) (3) 164 (3) O10 H101O5 iii 0.82 (2) 2.16 (3) (3) 147 (3) O10 H102O7 v (16) 2.28 (2) (3) 147 (3) O11 H111O3 v 0.80 (2) 2.18 (2) (3) 157 (3) Symmetry codes: (i) x þ 1; y; z; (ii) x þ 1; y þ 1; z þ 2; (iii) x þ 3 2 ; y 1 2 ; z þ 3 2 ; (iv) x þ 1; y þ 1; z þ 1; (v) x þ 1 2 ; y 1 2 ; z þ 3 2. Data collection: CrysAlis CCD (Oxford Diffraction, 2005); cell refinement: CrysAlis RED (Oxford Diffraction, 2005); data reduction: CrysAlis RED; program(s) used to solve structure: SIR2002 (Burla et al., 2003); program(s) used to refine structure: JANA2000 (Petříček et al., 2007); molecular graphics: DIAMOND (Brandenburg & Putz, 2005); software used to prepare material for publication: JANA2000. This work was supported by the Grant Agency of the Czech Republic (grant No. 202/05/0421). Experimental Crystal data TbHP 2 O 7 4H 2 O M r = Monoclinic, P2 1 =n a = (6) Å b = (9) Å c = (13) Å = (8) Data collection Oxford Diffraction Xcalibur 2 diffractometer with Sapphire 2 CCD area-detector Absorption correction: analytical [CrysAlis RED (Oxford Diffraction, 2005), using a multifaceted crystal model based on V = (15) Å 3 Z =4 Mo K radiation = 8.38 mm 1 T = 295 K mm expressions derived by Clark & Reid (1995)] T min = 0.329, T max = measured reflections 1850 independent reflections 1628 reflections with I > 3(I) R int = Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: WM2172). References Anna-Rabah, Z., Chehimi-Moumen, F., Ben Hassen-Chehimi, D. & Trabelsi- Ayadi, M. (2006). Solid State Sci. 8, Brandenburg, K. & Putz, H. (2005). DIAMOND. Version 3. Crystal Impact GbR, Postfach 1251, D Bonn, Germany. Burla, M. C., Camalli, M., Carrozzini, B., Cascarano, G. L., Giacovazzo, C., Polidori, G. & Spagna, R. (2003). J. Appl. Cryst. 36, Chehimi-Moumen, F., Ferid, M., Ben-Hassen-Chehimi, D. & Trabelsi-Ayadi, M. (2002). Solid State Sci. 4, Clark, R. C. & Reid, J. S. (1995). Acta Cryst. A51, Hraiech, S., Chehimi-Moumen, F., Ferid, M., Ben Hassen-Chehimi, D. & Trabelsi-Ayadi, D. (2005). Mater. Res. Bull. 40, Oxford Diffraction (2005). CrysAlis CCD and CrysAlis RED. Oxford Diffraction Ltd, Abingdon, Oxfordshire, England. Petříček, V., Dušek, M. & Palatinus, L. (2007). JANA2000. Institute of Physics, Prague, Czech Republic. doi: /s Fejfarová et al. i15

2 [doi: /s ] Terbium(III) hydrogendiphosphate(v) tetrahydrate Karla Fejfarová, Rachid Essehli, Brahim El Bali and Michal Dušek S1. Comment Acidic rare earth diphosphates of general formula REHP 2 O 7. nh 2 O exhibit interesting luminescent and optical properties (Hraiech et al., 2005 and references herein). The title compound is isostructural with other compounds of formula type REHP 2 O 7. 4H 2 O, RE = Sm (Chehimi-Moumen et al., 2002), Gd (Hraiech et al., 2005), and Eu (Anna-Rabah et al., 2006). The structure of TbHP 2 O 7. 4H 2 O is made up of TbO 8 polyhedra and HP 2 O 7 groups that form a three-dimensional framework. In channels running along a (Fig. 2) free water molecules are located which are connected via hydrogen bonds with the framework (see hydrogen-bonding Table). The P 2 O 7 group is protonated, with the H atom located at O4 (Fig. 1), as also indicated by elongation of the corresponding P O distance. The bridging angle P1 O7 P2 between the two PO 4 tetrahedra is (11). S2. Experimental An aqueous solution of TbCl 3. 6H 2 O (0.1M) was added dropwise to anhydrous Na 4 P 2 O 7 dissolved in destilled water (0.1M). The ph of the mixture was controlled with diluted hydrochloric acid to be slightly acidic, and the solution was stirred for two h at room temperature. Prismatic-shaped colourless crystals with a maximal size of 0.3 mm formed after a few days on slow evaporation. S3. Refinement The H atoms were localized from a difference Fourier map. Their coordinates were refined independently with O H distances restrained to 0.82 (1) Å. The isotropic temperature parameters of the H atoms were refined with 1.2U eq of the parent atom. The H111 O11 H112 angle of the free water molecule was restrained to (10). sup-1

3 Figure 1 Part of the structure of HTbP 2 O 7. 4H 2 O drawn with displacement ellipsoids at the 50% probability level. [Symmetry codes: (i) 1 + x, y, z; (ii) x, -1/2 + y, z; (iii) 1 - x, 1 - y, 2 - z] sup-2

4 Figure 2 The packing of TbHP 2 O 7. 4H 2 O viewed along a. Hydrogen bonds are represented by dashed lines. Colour code: Pink (P 2 O 7 polyhedra), red spheres (O), grey spheres (Tb), dark grey spheres (H). All atoms are displayed with arbitrary radii. For clarity, O atoms belonging to PO 4 tetrahedra have a smaller size than O atoms of water molecules. O atoms that would obscure H atoms important for understanding the hydrogen bonding scheme are plotted semitransparently. Terbium(III) hydrogendiphosphate(v) tetrahydrate Crystal data TbHP 2 O 7 4H 2 O M r = Monoclinic, P2 1 /n Hall symbol: -P 2yn a = (6) Å b = (9) Å c = (13) Å β = (8) V = (15) Å 3 Z = 4 F(000) = 768 D x = Mg m 3 sup-3

5 Mo Kα radiation, λ = Å Cell parameters from 972 reflections θ = µ = 8.38 mm 1 Data collection Oxford Diffraction CCD diffractometer Radiation source: X-ray tube Graphite monochromator Detector resolution: pixels mm -1 ω scans Absorption correction: analytical [CrysAlis RED (Oxford Diffraction, 2005), using a multifaceted crystal model based on expressions derived by Clark & Reid (1995)] Refinement Refinement on F 2 R[F 2 > 2σ(F 2 )] = wr(f 2 ) = S = reflections 155 parameters 10 restraints 9 constraints H atoms treated by a mixture of independent and constrained refinement Special details T = 295 K Prism, colorless mm T min = 0.329, T max = measured reflections 1850 independent reflections 1628 reflections with I > 3σ(I) R int = θ max = 26.6, θ min = 2.5 h = 8 7 k = l = Weighting scheme based on measured s.u.'s w = 1/[σ 2 (I) I 2 ] (Δ/σ) max = Δρ max = 0.29 e Å 3 Δρ min = 0.21 e Å 3 Extinction correction: B-C type 1 Lorentzian isotropic [Becker, P. J. & Coppens, P. (1974). Acta Cryst. A30, ] Extinction coefficient: 2.9 (8) Refinement. The refinement was carried out against all reflections. The conventional R-factor is always based on F. The goodness of fit as well as the weighted R-factor are based on F and F 2 for refinement carried out on F and F 2, respectively. The threshold expression is used only for calculating R-factors etc. and it is not relevant to the choice of reflections for refinement. The program used for refinement, Jana2000, uses the weighting scheme based on the experimental expectations, see _refine_ls_weighting_details, that does not force S to be one. Therefore the values of S may be larger then the ones from the SHELX program. Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 ) x y z U iso */U eq Tb (17) (10) (10) (5) P (9) (6) (5) (18) P (9) (5) (5) (18) O (3) (15) (15) (5) O (3) (16) (16) (5) O (3) (15) (15) (5) O (3) (15) (17) (6) O (3) (15) (16) (5) O (2) (15) (15) (5) O (3) (14) (14) (5) O (3) (18) (17) (6) O (4) (17) (17) (7) sup-4

6 O (3) (19) (2) (7) O (4) (19) (2) (9) H (4) (3) (18) * H (4) (18) (3) * H (2) (3) (2) * H (2) (3) (3) * H (5) (15) (3) 0.04* H (5) (3) (2) * H (4) (13) (3) * H (4) (10) (3) * H (2) (3) (3) 0.04* Atomic displacement parameters (Å 2 ) U 11 U 22 U 33 U 12 U 13 U 23 Tb (8) (8) (8) (4) (5) (4) P (3) (3) (3) (2) (2) (2) P (3) (3) (3) (2) (2) (2) O (9) (8) (9) (7) (7) (7) O (9) (9) (10) (7) (8) (7) O (10) (8) (10) (8) (7) (7) O (11) (9) (10) (8) (8) (7) O (9) (9) (10) (7) (8) (7) O (9) (8) (9) (7) (7) (7) O (9) (8) (9) (7) (7) (7) O (11) (10) (11) (9) (8) (8) O (13) (10) (11) (10) (9) (8) O (10) (10) (17) (9) (11) (11) O (17) (11) (16) (10) (14) (10) Geometric parameters (Å, º) Tb1 O (17) P1 O (18) Tb1 O2 i (17) P1 O (18) Tb1 O3 ii (18) P1 O (19) Tb1 O (18) P1 O (18) Tb1 O6 iii (17) P2 O (2) Tb1 O (2) P2 O (19) Tb1 O (2) P2 O (18) Tb1 O (2) P2 O (18) O1 Tb1 O2 i (6) O6 iii Tb1 O (6) O1 Tb1 O3 ii (6) O6 iii Tb1 O (7) O1 Tb1 O (6) O6 iii Tb1 O (6) O1 Tb1 O6 iii (6) O8 Tb1 O (6) O1 Tb1 O (6) O8 Tb1 O (7) O1 Tb1 O (7) O9 Tb1 O (8) O1 Tb1 O (7) O1 P1 O (10) sup-5

7 O2 i Tb1 O3 ii (6) O1 P1 O (10) O2 i Tb1 O (6) O1 P1 O (10) O2 i Tb1 O6 iii (6) O2 P1 O (11) O2 i Tb1 O (6) O2 P1 O (10) O2 i Tb1 O (7) O3 P1 O (10) O2 i Tb1 O (7) O4 P2 O (10) O3 ii Tb1 O (6) O4 P2 O (10) O3 ii Tb1 O6 iii (6) O4 P2 O (10) O3 ii Tb1 O (6) O5 P2 O (10) O3 ii Tb1 O (7) O5 P2 O (10) O3 ii Tb1 O (8) O6 P2 O (10) O5 Tb1 O6 iii (6) H81 O8 H (3) O5 Tb1 O (6) H91 O9 H (3) O5 Tb1 O (6) H101 O10 H (3) O5 Tb1 O (7) H111 O11 H (3) Symmetry codes: (i) x+1, y, z; (ii) x+1, y+1, z+2; (iii) x+3/2, y 1/2, z+3/2. Hydrogen-bond geometry (Å, º) D H A D H H A D A D H A O4 H41 O (13) (14) (3) 174 (3) O8 H81 O1 ii 0.82 (2) 1.98 (3) (3) 159 (3) O8 H82 O3 i (18) (14) (3) 150 (3) O9 H91 O4 iv 0.83 (3) 2.06 (3) (3) 161 (3) O9 H92 O8 iii (18) 1.95 (2) (3) 164 (3) O10 H101 O5 iii 0.82 (2) 2.16 (3) (3) 147 (3) O10 H102 O7 v (16) 2.28 (2) (3) 147 (3) O11 H111 O3 v 0.80 (2) 2.18 (2) (3) 157 (3) Symmetry codes: (i) x+1, y, z; (ii) x+1, y+1, z+2; (iii) x+3/2, y 1/2, z+3/2; (iv) x+1, y+1, z+1; (v) x+1/2, y 1/2, z+3/2. sup-6