Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536803010791/dn6069sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536803010791/dn6069Isup2.hkl |
La synthèse du composé étudié a été réalisée à partir d'un mélange de Ce(NO3)3·6H2O (Prolabo, 99.5%), Na2CO3 (Fluka, 99.5%), H3PO4 (Prolabo, 85%, density 1.70 Mg.m−3) et H2O pris respectivement dans les proportions molaires 1:1:15:100. Après trois semaines d'évaporation à température ambiante [298 (2) K], des cristaux incolores, de taille suffisante pour une étude structurale, apparaissent dans une matrice gélatineuse.
Les H des groupements hydroxyles ont été introduits en utilisant l'option AFIX 147 du programme SHELXL97 (Sheldrick, 1997) et en introduisant un facteur de température isotrope 50% supérieur au U équivalent de l'atome d'oxygène (−1.5 à la place de la valeur de U). Les H de la molécule d'eau désordonnée n'ont pu être localisés.
Data collection: CAD-4 EXPRESS (Duisenberg, 1992; Macíček & Yordanov, 1992); cell refinement: CAD-4 EXPRESS; data reduction: XCAD4 (Harms & Wocadlo, 1995); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: DIAMOND (Brandenburg, 1998); software used to prepare material for publication: SHELXL97.
Na0.66Ce0.1133(H2PO4)·H2O | Dx = 2.412 Mg m−3 |
Mr = 146.03 | Mo Kα radiation, λ = 0.71069 Å |
Tetragonal, P4/nnc | Cell parameters from 25 reflections |
Hall symbol: -P 4a 2bc | θ = 10.4–14.9° |
a = 10.187 (2) Å | µ = 1.90 mm−1 |
c = 15.497 (3) Å | T = 293 K |
V = 1608.3 (5) Å3 | Prism, colorless |
Z = 16 | 0.55 × 0.45 × 0.45 mm |
F(000) = 1165 |
Enraf-Nonius CAD-4 diffractometer | 847 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.011 |
Graphite monochromator | θmax = 26.9°, θmin = 2.4° |
ω/2θ scans | h = 0→12 |
Absorption correction: ψ scan (North et al., 1968) | k = 0→12 |
Tmin = 0.388, Tmax = 0.426 | l = 0→19 |
1679 measured reflections | 2 standard reflections every 120 min |
880 independent reflections | intensity decay: 1% |
Refinement on F2 | Primary atom site location: heavy-atom method |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.025 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.068 | H-atom parameters constrained |
S = 1.18 | w = 1/[σ2(Fo2) + (0.0356P)2 + 2.4837P] where P = (Fo2 + 2Fc2)/3 |
880 reflections | (Δ/σ)max < 0.001 |
84 parameters | Δρmax = 0.81 e Å−3 |
1 restraint | Δρmin = −0.35 e Å−3 |
Na0.66Ce0.1133(H2PO4)·H2O | Z = 16 |
Mr = 146.03 | Mo Kα radiation |
Tetragonal, P4/nnc | µ = 1.90 mm−1 |
a = 10.187 (2) Å | T = 293 K |
c = 15.497 (3) Å | 0.55 × 0.45 × 0.45 mm |
V = 1608.3 (5) Å3 |
Enraf-Nonius CAD-4 diffractometer | 847 reflections with I > 2σ(I) |
Absorption correction: ψ scan (North et al., 1968) | Rint = 0.011 |
Tmin = 0.388, Tmax = 0.426 | 2 standard reflections every 120 min |
1679 measured reflections | intensity decay: 1% |
880 independent reflections |
R[F2 > 2σ(F2)] = 0.025 | 1 restraint |
wR(F2) = 0.068 | H-atom parameters constrained |
S = 1.18 | Δρmax = 0.81 e Å−3 |
880 reflections | Δρmin = −0.35 e Å−3 |
84 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | Occ. (<1) | |
Ce | 0.2500 | 0.2500 | 0.2500 | 0.0067 (1) | 0.906 (3) |
Na1 | 0.5169 (1) | 0.5169 (1) | 0.2500 | 0.0248 (5) | 0.893 (4) |
Na2 | 0.2500 | 0.2500 | −0.0168 (2) | 0.0223 (8) | 0.854 (8) |
P | 0.27169 (6) | 0.54364 (6) | 0.11298 (4) | 0.0145 (2) | |
O1 | 0.2271 (2) | 0.4780 (2) | 0.0266 (1) | 0.0268 (5) | |
H1 | 0.2025 | 0.5348 | −0.0072 | 0.040* | |
O2 | 0.3180 (2) | 0.4328 (2) | 0.1703 (1) | 0.0179 (4) | |
O3 | 0.3746 (2) | 0.6484 (2) | 0.0982 (1) | 0.0230 (4) | |
O4 | 0.1472 (2) | 0.6094 (2) | 0.1556 (1) | 0.0255 (5) | |
H4 | 0.1553 | 0.6895 | 0.1545 | 0.038* | |
OW1 | 0.5684 (7) | 0.7500 | 0.2500 | 0.026 (1) | 0.44 |
OW2 | 0.6539 (8) | 0.6603 (8) | 0.3489 (4) | 0.055 (2) | 0.47 |
OW3 | 0.637 (1) | 0.754 (1) | 0.3145 (7) | 0.060 (3) | 0.31 |
U11 | U22 | U33 | U12 | U13 | U23 | |
Ce | 0.0069 (2) | 0.0069 (2) | 0.0064 (2) | 0.000 | 0.000 | 0.000 |
Na1 | 0.0200 (6) | 0.0200 (6) | 0.034 (1) | −0.0017 (7) | 0.0067 (5) | −0.0067 (5) |
Na2 | 0.019 (1) | 0.019 (1) | 0.028 (1) | 0.000 | 0.000 | 0.000 |
P | 0.0160 (3) | 0.0128 (3) | 0.0147 (3) | −0.0004 (2) | 0.0006 (2) | 0.0035 (2) |
O1 | 0.040 (1) | 0.020 (1) | 0.0210 (9) | 0.0010 (8) | −0.0105 (8) | 0.0028 (8) |
O2 | 0.0168 (9) | 0.0188 (9) | 0.0181 (8) | 0.0006 (7) | 0.0005 (7) | 0.0063 (7) |
O3 | 0.026 (1) | 0.0180 (9) | 0.0254 (9) | −0.0047 (8) | 0.0084 (8) | 0.0003 (7) |
O4 | 0.022 (1) | 0.0182 (9) | 0.036 (1) | 0.0032 (7) | 0.0087 (8) | 0.0075 (8) |
OW1 | 0.030 (4) | 0.029 (3) | 0.021 (3) | 0.000 | 0.000 | 0.001 (3) |
OW2 | 0.059 (4) | 0.063 (4) | 0.043 (3) | −0.026 (3) | 0.011 (3) | 0.007 (3) |
OW3 | 0.043 (5) | 0.065 (7) | 0.071 (6) | 0.003 (5) | 0.018 (5) | 0.007 (7) |
Ce—O2i | 2.339 (2) | Na2—O1vi | 2.429 (2) |
Ce—O2ii | 2.339 (2) | Na2—O1ii | 2.429 (2) |
Ce—O2iii | 2.339 (2) | Na2—OW2x | 2.475 (7) |
Ce—O2iv | 2.339 (2) | Na2—OW2xi | 2.475 (7) |
Ce—O2v | 2.339 (2) | Na2—OW2xii | 2.475 (7) |
Ce—O2vi | 2.339 (2) | Na2—OW2xiii | 2.475 (7) |
Ce—O2 | 2.339 (2) | Na2—OW3xi | 2.855 (11) |
Ce—O2vii | 2.339 (2) | Na2—OW3x | 2.85 (1) |
Ce—Na1ii | 3.8458 (18) | Na2—OW3xii | 2.855 (11) |
Ce—Na1 | 3.8458 (18) | Na2—OW3xiii | 2.855 (11) |
Ce—Na1iii | 3.8458 (18) | P—O2 | 1.513 (2) |
Ce—Na1v | 3.8458 (18) | P—O3 | 1.514 (2) |
Na1—O4vii | 2.414 (2) | P—O1 | 1.564 (2) |
Na1—O4iii | 2.414 (2) | P—O4 | 1.579 (2) |
Na1—OW1 | 2.431 (2) | O4—Na1iii | 2.4138 (19) |
Na1—OW1i | 2.431 (2) | OW1—OW3ix | 1.223 (12) |
Na1—O2 | 2.523 (2) | OW1—OW3 | 1.223 (12) |
Na1—O2i | 2.523 (2) | OW1—Na1ix | 2.431 (2) |
Na1—OW2 | 2.536 (7) | OW2—OW3viii | 1.103 (12) |
Na1—OW2i | 2.536 (7) | OW2—OW3 | 1.107 (12) |
Na1—OW3viii | 2.82 (1) | OW2—Na2xiv | 2.475 (7) |
Na1—OW3ix | 2.818 (12) | OW3—OW2xv | 1.103 (12) |
Na1—OW3 | 2.89 (1) | OW3—OW3xv | 1.623 (14) |
Na1—OW3i | 2.889 (13) | OW3—OW3viii | 1.623 (14) |
Na2—O1 | 2.429 (2) | OW3—Na1ix | 2.818 (12) |
Na2—O1vii | 2.429 (2) | OW3—Na2xiv | 2.855 (11) |
O2ii—Ce—O2vi | 73.83 (4) | O2vii—Ce—O2v | 78.88 (8) |
O2ii—Ce—O2vii | 73.83 (4) | O2i—Ce—O2v | 73.83 (4) |
O2vi—Ce—O2vii | 116.29 (9) | O2—Ce—O2v | 145.55 (8) |
O2ii—Ce—O2i | 138.59 (9) | O2iii—Ce—O2v | 116.29 (9) |
O2vi—Ce—O2i | 145.55 (8) | O2iv—Ce—O2v | 73.83 (4) |
O2vii—Ce—O2i | 74.48 (9) | O2—P—O3 | 113.5 (1) |
O2ii—Ce—O2 | 116.29 (9) | O2—P—O1 | 105.9 (1) |
O2vi—Ce—O2 | 73.83 (4) | O3—P—O1 | 111.9 (1) |
O2vii—Ce—O2 | 73.83 (4) | O2—P—O4 | 108.8 (1) |
O2i—Ce—O2 | 78.88 (8) | O3—P—O4 | 108.7 (1) |
O2ii—Ce—O2iii | 145.55 (8) | O1—P—O4 | 107.8 (1) |
O2vi—Ce—O2iii | 78.88 (8) | O2—P—Na1 | 47.34 (7) |
O2vii—Ce—O2iii | 138.59 (9) | O3—P—Na1 | 68.27 (8) |
O2i—Ce—O2iii | 73.83 (4) | O1—P—Na1 | 137.52 (8) |
O2—Ce—O2iii | 74.48 (9) | O4—P—Na1 | 112.04 (8) |
O2ii—Ce—O2iv | 78.88 (8) | P—O1—Na2 | 128.17 (12) |
O2vi—Ce—O2iv | 74.48 (9) | P—O1—H1 | 109.5 |
O2vii—Ce—O2iv | 145.55 (8) | Na2—O1—H1 | 121.9 |
O2i—Ce—O2iv | 116.29 (9) | P—O2—Ce | 144.3 (1) |
O2—Ce—O2iv | 138.59 (9) | P—O2—Na1 | 106.50 (9) |
O2iii—Ce—O2iv | 73.83 (4) | Ce—O2—Na1 | 104.49 (7) |
O2ii—Ce—O2v | 74.48 (9) | P—O4—Na1iii | 130.10 (11) |
O2vi—Ce—O2v | 138.59 (9) | P—O4—H4 | 109.5 |
Symmetry codes: (i) y, x, −z+1/2; (ii) −x+1/2, −y+1/2, z; (iii) −x+1/2, y, −z+1/2; (iv) −y+1/2, −x+1/2, −z+1/2; (v) x, −y+1/2, −z+1/2; (vi) −y+1/2, x, z; (vii) y, −x+1/2, z; (viii) −y+3/2, x, z; (ix) x, −y+3/2, −z+1/2; (x) y−1/2, x−1/2, z−1/2; (xi) x−1/2, −y+1, z−1/2; (xii) −x+1, y−1/2, z−1/2; (xiii) −y+1, −x+1, z−1/2; (xiv) −x+1, y+1/2, z+1/2; (xv) y, −x+3/2, z. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···O3xvi | 0.82 | 1.77 | 2.576 (3) | 166 |
O4—H4···O3xvii | 0.82 | 1.89 | 2.631 (3) | 149 |
Symmetry codes: (xvi) y−1/2, −x+1, −z; (xvii) −x+1/2, −y+3/2, z. |
Experimental details
Crystal data | |
Chemical formula | Na0.66Ce0.1133(H2PO4)·H2O |
Mr | 146.03 |
Crystal system, space group | Tetragonal, P4/nnc |
Temperature (K) | 293 |
a, c (Å) | 10.187 (2), 15.497 (3) |
V (Å3) | 1608.3 (5) |
Z | 16 |
Radiation type | Mo Kα |
µ (mm−1) | 1.90 |
Crystal size (mm) | 0.55 × 0.45 × 0.45 |
Data collection | |
Diffractometer | Enraf-Nonius CAD-4 diffractometer |
Absorption correction | ψ scan (North et al., 1968) |
Tmin, Tmax | 0.388, 0.426 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 1679, 880, 847 |
Rint | 0.011 |
(sin θ/λ)max (Å−1) | 0.637 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.025, 0.068, 1.18 |
No. of reflections | 880 |
No. of parameters | 84 |
No. of restraints | 1 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.81, −0.35 |
Computer programs: CAD-4 EXPRESS (Duisenberg, 1992; Macíček & Yordanov, 1992), CAD-4 EXPRESS, XCAD4 (Harms & Wocadlo, 1995), SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), DIAMOND (Brandenburg, 1998), SHELXL97.
Ce—O2i | 2.339 (2) | Na1—OW2 | 2.536 (7) |
Ce—O2ii | 2.339 (2) | Na1—OW3viii | 2.82 (1) |
Ce—O2iii | 2.339 (2) | Na1—OW3 | 2.89 (1) |
Ce—O2iv | 2.339 (2) | Na2—O1 | 2.429 (2) |
Ce—O2v | 2.339 (2) | Na2—O1vii | 2.429 (2) |
Ce—O2vi | 2.339 (2) | Na2—O1vi | 2.429 (2) |
Ce—O2 | 2.339 (2) | Na2—O1ii | 2.429 (2) |
Ce—O2vii | 2.339 (2) | Na2—OW2ix | 2.475 (7) |
Na1—O4vii | 2.414 (2) | Na2—OW3ix | 2.85 (1) |
Na1—O4iii | 2.414 (2) | P—O2 | 1.513 (2) |
Na1—OW1 | 2.431 (2) | P—O3 | 1.514 (2) |
Na1—O2 | 2.523 (2) | P—O1 | 1.564 (2) |
Na1—O2i | 2.523 (2) | P—O4 | 1.579 (2) |
O2ii—Ce—O2 | 116.29 (9) | O2—P—O1 | 105.9 (1) |
O2vi—Ce—O2 | 73.83 (4) | O3—P—O1 | 111.9 (1) |
O2i—Ce—O2 | 78.88 (8) | O2—P—O4 | 108.8 (1) |
O2—Ce—O2iii | 74.48 (9) | O3—P—O4 | 108.7 (1) |
O2—Ce—O2iv | 138.59 (9) | O1—P—O4 | 107.8 (1) |
O2—Ce—O2v | 145.55 (8) | P—O1—H1 | 109.5 |
O2—P—O3 | 113.5 (1) | P—O4—H4 | 109.5 |
Symmetry codes: (i) y, x, −z+1/2; (ii) −x+1/2, −y+1/2, z; (iii) −x+1/2, y, −z+1/2; (iv) −y+1/2, −x+1/2, −z+1/2; (v) x, −y+1/2, −z+1/2; (vi) −y+1/2, x, z; (vii) y, −x+1/2, z; (viii) −y+3/2, x, z; (ix) y−1/2, x−1/2, z−1/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···O3x | 0.82 | 1.77 | 2.576 (3) | 166 |
O4—H4···O3xi | 0.82 | 1.89 | 2.631 (3) | 149 |
Symmetry codes: (x) y−1/2, −x+1, −z; (xi) −x+1/2, −y+3/2, z. |
Depuis la découverte de l'effet Laser dans les matériaux NdP5O14 (Danielmeyer & Weber, 1972; Weber et al., 1973) et LiNd(PO3)4 (Nakano & Yamada, 1976), les travaux de recherche sur les phosphates de terres rares se sont intensifiés aussi bien sur le plan fondamental, du point de vue spectroscopique (Auzel & Chen, 1995; Chen et al., 1996), que dans le domaine de recherche de nouvelles applications (Ohtsuki et al., 1995; Horchani et al., 2001). C'est dans ce cadre que nous avons entrepris l'exploration du système Na2O—Ce2O3—P2O5—H2O dans lequel nous venons de mettre en évidence le composé original Na0.6601Ce0.1133(H2PO4)·H2O.
La structure de ce dernier peut être décrite à partir de l'unité [Ce(H2PO4)8] (Fig. 1). Cette unité est constituée d'un antiprisme à base carrée CeO8 partageant ses sommets avec huit groupements H2PO4 différents. La cohésion entre ces unités est assurée par les liaisons hydrogène. Il en résulte une charpente tridimensionnelle présentant des tunnels interconnectés, parallèles respectivement aux directions a et c, où logent les ions sodium (Fig. 2). Par ailleurs, si on se limite à une sphère de coordination de rayon 3 Å (Shannon, 1976), on remarque que les ions sodium sont environnés par deux types d'atomes d'oxygène: ceux appartenant aux groupements H2PO4 [Na—O 2.449 (2) Å] et ceux appartenant à des molécules d'eau délocalisées [Na—Ow 2.667 (9) Å] (Fig. 3). Les différentes distances interatomiques: Ce—O, Na—O et P—O observées dans cette structure sont en bon accord avec celles rencontrées dans la littérature (Guesmi et al., 2000; Belam et al., 1997). Une filiation structurale peut être observée avec le composé Na(H2PO4)·H2O (Catti et al., 1976). En effet, en considérant dans la structure de Na(H2PO4)·H2O, le prisme droit à base carrée construit sur les vecteurs a = (a1– b1), b = (a1+ b1) et c = 2c1 avec a1 = 7.616 (5), b1 = 7.899 (3) e t c1 = 7.382 (2) Å; les vecteurs de base de la maille orthorhombique du composé Na(H2PO4)·H2O, on obtient une maille pseudo-quadratique de paramètres a = 10.972 Å e t c = 14.764 Å comparables à ceux de la maille quadratique du composé Na0.6601Ce0.1133(H2PO4)·H2O. Le passage de la structure de Na(H2PO4)·H2O à celle du composé étudié peut être réalisé par occupation des atomes de cerium de deux sites situés à (1/4, 1/4, 1/4) e t (3/4, 3/4, 3/4). L'établissement des ponts Ce—O—P entre deux paires de quatre groupements H2PO4 appartenant respectivement aux plans z = 1/8 e t z = 3/8 conduit à la formation de l'unité [Ce(H2PO4)8] observée dans la structure de Na0.6601Ce0.1133(H2PO4)·H2O.