Acta Cryst. (2008). E64, i33 [ doi:10.1107/S1600536808013032 ]
The structure of the title compound, LuP5O14, comprises puckered eight-membered PO4 rings linked by the lutetium cations in a complex way, forming a three-dimensional framework. Each eight-membered phosphate ring shares a bridging tetrahedron with each of four adjacent tetrahedra, to form layers of PO4 tetrahedra. These layers are c/2 in thickness and parallel to the ab plane. Each Lu ion is contained in one such layer, forming bonds to six O atoms in that layer and also to one O atom belonging to a tetrahedron in each of the layers lying above and below it. The LuO8 polyhedra are isolated from one another, since they share no common atoms. The Lu ions lie on twofold axes (special position 4e) and the shortest Lu
Lu distance is 5.703 (1) Å.
Single crystal of LuP5O14 was prepared by flux method. At room temperature, 0.5 g of Lu2O3 were slowly added to 10 ml of phosphoric acid H3PO4 (85%). The mixture was then slowly heated to 673 K and kept at this temperature for seven days. colorless, crystals were separated from the excess phosphoric acid by washing the product in boiling water.
The highest peak and the deepest hole are located 0.79Å and 0.54 Å, respectively, from Lu1 and Lu2.
Data collection: CAD-4 EXPRESS (Duisenberg, 1992; Enraf–Nonius, 1994; Macíček & Yordanov, 1992); cell refinement: CAD-4 EXPRESS (Duisenberg, 1992; Enraf–Nonius, 1994; Macíček & Yordanov, 1992)'; data reduction: XCAD4 (Harms & Wocadlo, 1995); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 2001); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).
![[Figure 1]](./br2072fig1thm.gif)
| Fig. 1. The structural arrangement of LuP5O14 along the a axis, showing tunnels in which the Lu ions are located. |
![[Figure 2]](./br2072fig2thm.gif)
| Fig. 2. Projection of the ultraphosphate with anisotropic displacement parameters drawn at the 50% probability level. [Symmetry codes: (i) x, y+1, z ; (ii)-x+5/2, y+1/2, -z+3/2 ; (iii) x+1/2, y+1/2, z; (iv)x, -y+2, z-1/2 ; (v)x-1/2, -y+3/2, z-1/2. |
![[Figure 3]](./br2072fig3thm.gif)
| Fig. 3. a) Projection of one layer showing LuO8 polyhedra and linkage of PO4 tetrahedra forming rings (yellow) in LuP5O14. b) Projection of one layer along the b axis with c/2 thickness. |
| LuP5O14 | F000 = 2064 |
| Mr = 553.82 | Dx = 3.672 Mg m−3 |
| Monoclinic, C2/c | Mo Kα radiation λ = 0.71073 Å |
| Hall symbol: -C 2yc | Cell parameters from 7043 reflections |
| a = 12.8128 (14) Å | θ = 2.3–30.0º |
| b = 12.6821 (13) Å | µ = 10.74 mm−1 |
| c = 12.3330 (13) Å | T = 298 (2) K |
| β = 91.295 (3)º | Prism, colorless |
| V = 2003.5 (4) Å3 | 0.20 × 0.19 × 0.18 mm |
| Z = 8 |
| Enraf–Nonius CAD-4 diffractometer | Rint = 0.031 |
| Monochromator: graphite | θmax = 30.0º |
| T = 298(2) K | θmin = 2.3º |
| ω/2θ scans | h = −17→18 |
| Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | k = −17→17 |
| Tmin = 0.121, Tmax = 0.145 | l = −17→17 |
| 10422 measured reflections | 2 standard reflections |
| 2912 independent reflections | every 150 reflections |
| 2734 reflections with I > 2σ(I) | intensity decay: 2% |
| Refinement on F2 | Secondary atom site location: difference Fourier map |
| Least-squares matrix: full | w = 1/[σ2(Fo2) + (0.028P)2 + 3.0307P] where P = (Fo2 + 2Fc2)/3 |
| R[F2 > 2σ(F2)] = 0.019 | (Δ/σ)max = 0.003 |
| wR(F2) = 0.050 | Δρmax = 1.34 e Å−3 |
| S = 1.08 | Δρmin = −0.98 e Å−3 |
| 2912 reflections | Extinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
| 183 parameters | Extinction coefficient: 0.00637 (11) |
| Primary atom site location: structure-invariant direct methods |
| LuP5O14 | V = 2003.5 (4) Å3 |
| Mr = 553.82 | Z = 8 |
| Monoclinic, C2/c | Mo Kα |
| a = 12.8128 (14) Å | µ = 10.74 mm−1 |
| b = 12.6821 (13) Å | T = 298 (2) K |
| c = 12.3330 (13) Å | 0.20 × 0.19 × 0.18 mm |
| β = 91.295 (3)º |
| Enraf–Nonius CAD-4 diffractometer | 2734 reflections with I > 2σ(I) |
| Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | Rint = 0.031 |
| Tmin = 0.121, Tmax = 0.145 | 2 standard reflections |
| 10422 measured reflections | every 150 reflections |
| 2912 independent reflections | intensity decay: 2% |
| R[F2 > 2σ(F2)] = 0.019 | 183 parameters |
| wR(F2) = 0.050 | Δρmax = 1.34 e Å−3 |
| S = 1.08 | Δρmin = −0.98 e Å−3 |
| 2912 reflections |
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 | ||
| Lu1 | 1.0000 | 1.019590 (11) | 0.7500 | 0.00946 (6) | |
| Lu2 | 1.0000 | 0.469251 (11) | 0.7500 | 0.00947 (6) | |
| P1 | 1.18263 (5) | 0.63687 (5) | 0.89095 (5) | 0.01020 (13) | |
| P2 | 0.97504 (5) | 0.65029 (5) | 0.96672 (5) | 0.01037 (13) | |
| P3 | 0.85012 (5) | 0.83192 (5) | 0.89783 (5) | 0.01042 (13) | |
| P4 | 0.85469 (5) | 0.96507 (5) | 0.50182 (6) | 0.01080 (14) | |
| P5 | 1.17542 (6) | 1.24856 (5) | 0.76032 (6) | 0.01017 (14) | |
| O1 | 1.15332 (15) | 0.54741 (15) | 0.82204 (16) | 0.0131 (4) | |
| O2 | 1.24259 (17) | 0.72754 (16) | 0.83475 (17) | 0.0131 (4) | |
| O3 | 1.09081 (14) | 0.69824 (15) | 0.94396 (15) | 0.0120 (3) | |
| O4 | 1.24970 (13) | 0.60463 (17) | 0.99342 (13) | 0.0121 (4) | |
| O5 | 0.97503 (15) | 0.59905 (15) | 1.07328 (15) | 0.0137 (4) | |
| O6 | 0.93961 (15) | 0.59620 (15) | 0.86627 (15) | 0.0132 (4) | |
| O7 | 0.91291 (17) | 0.75979 (14) | 0.97911 (18) | 0.0114 (4) | |
| O8 | 0.90954 (15) | 0.87184 (15) | 0.80717 (15) | 0.0132 (4) | |
| O9 | 0.75333 (18) | 0.76371 (15) | 0.86473 (18) | 0.0128 (4) | |
| O10 | 0.80606 (15) | 0.91824 (14) | 0.97493 (15) | 0.0123 (4) | |
| O11 | 0.88893 (16) | 0.96091 (15) | 0.61582 (16) | 0.0139 (4) | |
| O12 | 0.92416 (15) | 1.06579 (15) | 0.91286 (15) | 0.0135 (4) | |
| O13 | 1.12590 (16) | 0.34943 (15) | 0.73083 (16) | 0.0142 (4) | |
| O14 | 1.11367 (16) | 1.15411 (15) | 0.78473 (16) | 0.0147 (4) |
| U11 | U22 | U33 | U12 | U13 | U23 | |
| Lu1 | 0.00912 (9) | 0.00934 (9) | 0.00992 (9) | 0.000 | −0.00025 (6) | 0.000 |
| Lu2 | 0.00918 (9) | 0.00909 (8) | 0.01011 (9) | 0.000 | −0.00038 (6) | 0.000 |
| P1 | 0.0100 (3) | 0.0094 (3) | 0.0112 (3) | 0.0001 (2) | −0.0002 (2) | 0.0002 (2) |
| P2 | 0.0100 (3) | 0.0099 (3) | 0.0112 (3) | 0.0004 (2) | 0.0001 (2) | 0.0002 (2) |
| P3 | 0.0103 (3) | 0.0097 (3) | 0.0112 (3) | −0.0001 (2) | −0.0002 (2) | 0.0000 (2) |
| P4 | 0.0108 (3) | 0.0097 (3) | 0.0119 (3) | −0.0006 (2) | −0.0003 (2) | 0.0001 (2) |
| P5 | 0.0094 (3) | 0.0099 (3) | 0.0112 (3) | −0.0002 (2) | −0.0004 (3) | −0.0006 (2) |
| O1 | 0.0125 (9) | 0.0125 (8) | 0.0143 (9) | −0.0011 (7) | 0.0008 (7) | −0.0012 (7) |
| O2 | 0.0142 (10) | 0.0108 (8) | 0.0144 (9) | −0.0013 (7) | 0.0030 (7) | 0.0002 (7) |
| O3 | 0.0099 (8) | 0.0113 (8) | 0.0149 (9) | 0.0002 (7) | 0.0013 (7) | −0.0004 (7) |
| O4 | 0.0115 (10) | 0.0129 (9) | 0.0118 (9) | 0.0024 (6) | −0.0014 (7) | −0.0003 (6) |
| O5 | 0.0148 (9) | 0.0127 (8) | 0.0135 (9) | 0.0004 (7) | −0.0001 (7) | 0.0015 (7) |
| O6 | 0.0132 (9) | 0.0135 (8) | 0.0129 (9) | 0.0018 (7) | −0.0009 (7) | −0.0010 (7) |
| O7 | 0.0107 (10) | 0.0119 (8) | 0.0116 (9) | 0.0017 (6) | −0.0008 (7) | −0.0007 (6) |
| O8 | 0.0153 (9) | 0.0122 (8) | 0.0122 (8) | −0.0023 (7) | 0.0012 (7) | −0.0001 (7) |
| O9 | 0.0119 (10) | 0.0136 (8) | 0.0129 (10) | −0.0016 (7) | −0.0012 (8) | 0.0000 (7) |
| O10 | 0.0123 (9) | 0.0098 (8) | 0.0150 (9) | 0.0007 (7) | 0.0013 (7) | −0.0012 (7) |
| O11 | 0.0150 (10) | 0.0142 (8) | 0.0125 (9) | −0.0020 (7) | −0.0014 (7) | 0.0002 (7) |
| O12 | 0.0143 (9) | 0.0129 (8) | 0.0135 (9) | −0.0007 (7) | 0.0013 (7) | 0.0002 (7) |
| O13 | 0.0148 (9) | 0.0137 (8) | 0.0142 (9) | 0.0028 (7) | −0.0001 (7) | 0.0002 (7) |
| O14 | 0.0156 (9) | 0.0131 (8) | 0.0151 (9) | −0.0044 (7) | −0.0009 (7) | 0.0002 (7) |
| Lu1—O14 | 2.2775 (19) | P2—O7 | 1.6097 (19) |
| Lu1—O14i | 2.2775 (19) | P2—O3 | 1.633 (2) |
| Lu1—O11 | 2.283 (2) | P3—O8 | 1.458 (2) |
| Lu1—O11i | 2.283 (2) | P3—O9 | 1.559 (2) |
| Lu1—O8 | 2.3213 (19) | P3—O10 | 1.5638 (19) |
| Lu1—O8i | 2.3213 (19) | P3—O7 | 1.566 (2) |
| Lu1—O12 | 2.3260 (19) | P4—O11 | 1.464 (2) |
| Lu1—O12i | 2.3260 (19) | P4—O12iv | 1.481 (2) |
| Lu2—O13i | 2.2326 (19) | P4—O4v | 1.6111 (19) |
| Lu2—O13 | 2.2326 (19) | P4—O10iv | 1.637 (2) |
| Lu2—O6 | 2.3016 (19) | P5—O13vi | 1.470 (2) |
| Lu2—O6i | 2.3016 (19) | P5—O14 | 1.470 (2) |
| Lu2—O1 | 2.356 (2) | P5—O2vii | 1.614 (2) |
| Lu2—O1i | 2.356 (2) | P5—O9viii | 1.623 (2) |
| Lu2—O5ii | 2.3604 (19) | O2—P5ix | 1.614 (2) |
| Lu2—O5iii | 2.3604 (19) | O4—P4x | 1.6111 (19) |
| P1—O1 | 1.462 (2) | O5—Lu2iii | 2.3604 (19) |
| P1—O2 | 1.555 (2) | O9—P5xi | 1.623 (2) |
| P1—O3 | 1.5659 (19) | O10—P4xii | 1.637 (2) |
| P1—O4 | 1.5665 (18) | O12—P4xii | 1.481 (2) |
| P2—O5 | 1.466 (2) | O13—P5xiii | 1.470 (2) |
| P2—O6 | 1.479 (2) | ||
| O14—Lu1—O14i | 82.98 (10) | O13—Lu2—O5iii | 76.40 (7) |
| O14—Lu1—O11 | 140.00 (7) | O6—Lu2—O5iii | 73.85 (7) |
| O14i—Lu1—O11 | 73.88 (7) | O6i—Lu2—O5iii | 142.33 (7) |
| O14—Lu1—O11i | 73.88 (7) | O1—Lu2—O5iii | 73.25 (7) |
| O14i—Lu1—O11i | 140.00 (7) | O1i—Lu2—O5iii | 126.65 (7) |
| O11—Lu1—O11i | 141.95 (10) | O5ii—Lu2—O5iii | 136.94 (9) |
| O14—Lu1—O8 | 150.35 (7) | O1—P1—O2 | 115.98 (12) |
| O14i—Lu1—O8 | 109.89 (7) | O1—P1—O3 | 116.30 (11) |
| O11—Lu1—O8 | 69.49 (7) | O2—P1—O3 | 101.66 (11) |
| O11i—Lu1—O8 | 79.86 (7) | O1—P1—O4 | 113.30 (12) |
| O14—Lu1—O8i | 109.89 (7) | O2—P1—O4 | 106.56 (12) |
| O14i—Lu1—O8i | 150.35 (7) | O3—P1—O4 | 101.33 (10) |
| O11—Lu1—O8i | 79.86 (7) | O5—P2—O6 | 122.63 (12) |
| O11i—Lu1—O8i | 69.49 (7) | O5—P2—O7 | 106.70 (11) |
| O8—Lu1—O8i | 72.36 (10) | O6—P2—O7 | 109.67 (11) |
| O14—Lu1—O12 | 85.80 (7) | O5—P2—O3 | 109.73 (11) |
| O14i—Lu1—O12 | 72.29 (7) | O6—P2—O3 | 106.95 (11) |
| O11—Lu1—O12 | 116.25 (7) | O7—P2—O3 | 98.52 (11) |
| O11i—Lu1—O12 | 73.85 (7) | O8—P3—O9 | 114.72 (12) |
| O8—Lu1—O12 | 73.73 (7) | O8—P3—O10 | 115.17 (11) |
| O8i—Lu1—O12 | 133.38 (7) | O9—P3—O10 | 104.58 (12) |
| O14—Lu1—O12i | 72.29 (7) | O8—P3—O7 | 115.10 (12) |
| O14i—Lu1—O12i | 85.80 (7) | O9—P3—O7 | 103.75 (11) |
| O11—Lu1—O12i | 73.85 (7) | O10—P3—O7 | 101.94 (11) |
| O11i—Lu1—O12i | 116.25 (7) | O11—P4—O12iv | 121.99 (12) |
| O8—Lu1—O12i | 133.38 (7) | O11—P4—O4v | 105.88 (11) |
| O8i—Lu1—O12i | 73.73 (7) | O12iv—P4—O4v | 108.80 (11) |
| O12—Lu1—O12i | 150.82 (9) | O11—P4—O10iv | 109.37 (11) |
| O13i—Lu2—O13 | 94.22 (10) | O12iv—P4—O10iv | 108.74 (11) |
| O13i—Lu2—O6 | 98.99 (7) | O4v—P4—O10iv | 99.76 (11) |
| O13—Lu2—O6 | 142.75 (7) | O13vi—P5—O14 | 121.90 (13) |
| O13i—Lu2—O6i | 142.75 (7) | O13vi—P5—O2vii | 104.38 (11) |
| O13—Lu2—O6i | 98.99 (7) | O14—P5—O2vii | 112.10 (11) |
| O6—Lu2—O6i | 91.22 (10) | O13vi—P5—O9viii | 110.34 (11) |
| O13i—Lu2—O1 | 147.63 (7) | O14—P5—O9viii | 104.96 (11) |
| O13—Lu2—O1 | 74.22 (7) | O2vii—P5—O9viii | 101.37 (12) |
| O6—Lu2—O1 | 76.11 (7) | P1—O1—Lu2 | 138.32 (12) |
| O6i—Lu2—O1 | 69.60 (7) | P1—O2—P5ix | 141.48 (14) |
| O13i—Lu2—O1i | 74.22 (7) | P1—O3—P2 | 125.49 (12) |
| O13—Lu2—O1i | 147.63 (7) | P1—O4—P4x | 129.58 (12) |
| O6—Lu2—O1i | 69.60 (7) | P2—O5—Lu2iii | 170.97 (13) |
| O6i—Lu2—O1i | 76.11 (7) | P2—O6—Lu2 | 138.19 (12) |
| O1—Lu2—O1i | 130.25 (10) | P3—O7—P2 | 133.72 (14) |
| O13i—Lu2—O5ii | 76.40 (7) | P3—O8—Lu1 | 141.86 (12) |
| O13—Lu2—O5ii | 74.67 (7) | P3—O9—P5xi | 138.16 (14) |
| O6—Lu2—O5ii | 142.33 (7) | P3—O10—P4xii | 127.96 (13) |
| O6i—Lu2—O5ii | 73.85 (7) | P4—O11—Lu1 | 148.50 (12) |
| O1—Lu2—O5ii | 126.65 (7) | P4xii—O12—Lu1 | 147.46 (12) |
| O1i—Lu2—O5ii | 73.25 (7) | P5xiii—O13—Lu2 | 151.04 (13) |
| O13i—Lu2—O5iii | 74.67 (7) | P5—O14—Lu1 | 156.41 (13) |
| Symmetry codes: (i) −x+2, y, −z+3/2; (ii) x, −y+1, z−1/2; (iii) −x+2, −y+1, −z+2; (iv) x, −y+2, z−1/2; (v) x−1/2, −y+3/2, z−1/2; (vi) x, y+1, z; (vii) −x+5/2, y+1/2, −z+3/2; (viii) x+1/2, y+1/2, z; (ix) −x+5/2, y−1/2, −z+3/2; (x) x+1/2, −y+3/2, z+1/2; (xi) x−1/2, y−1/2, z; (xii) x, −y+2, z+1/2; (xiii) x, y−1, z. |
This work was supported by the Ministry of Higher Education, Scientific Research and Technology of Tunisia.
Bagieu-Beucher, M. & Tranqui, D. (1970). Bull. Soc. Fr. Mineral. Cristallogr. 93, 505–508.
Brandenburg, K. (2001). DIAMOND. Crystal Impact GbR, Bonn, Germany.
Duisenberg, A. J. M. (1992). J. Appl. Cryst. 25, 92–96.
Durif, A. (1971). Bull. Soc. Fr. Mineral. Cristallogr. 94, 314–318.
Enraf–Nonius (1994). CAD-4 EXPRESS. Enraf–Nonius, Delft, The Netherlands.
Harms, K. & Wocadlo, S. (1995). XCAD4. University of Marburg, Germany.
Hong, H. Y.-P. (1974). Acta Cryst. B30, 468–474.
Hong, H. Y.-P. & Pierce, J. W. (1974). Mater. Res. Bull. 9, 179–190.
Macíček, J. & Yordanov, A. (1992). J. Appl. Cryst. 25, 73–80.
Sheldrick, G. M. (1996). SADABS. University of Göttingen, Germany.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122.
The structure of LuP5O14 is a type (II) rare-earth ultraphosphates as classified by Bagieu-Beucher & Tranqui (1970), since it crystallizes in the monoclinic system with space group C2/c. In this structure, the lutetium ion is surrounded by eight oxygen atoms that form distorted polyhedra. Each of the oxygen atoms in the LuO8 polyhedra are shared exclusively with PO4 tetrahedra to form a three-dimensional framework, which delimits interesting tunnels (Fig.1). The structure is built up from (PO4) tetrahedra (Fig.2) which are cross-linked by bridging O atoms, but these do not form helical ribbons, as in the NdP5O14 structure type (I) (Hong, 1974), and HoP5O14 structure type (III) (Durif, 1971). The anion is being constructed from a succession of eight-membred rings interconnected through the ternary tetrahedra in a complex way (Fig.3a). The members of an individual ring are shown with yellow color. Each ring shares a bridging tetrahedron with each of four adjacent tetrahedra to form layers of PO4 tetrahedra, as illustrated in Fig.3b. These layers are about c/2 in thickness and parallel to the a-b plane. Each Lu ion is contained in one such layer, forming bonds to six oxygen in that layer and also to one oxygen belonging to a tetrahedron in each of the layers lying above and bolow it. the LuO8 polyhedra are isolated from one another, since they share no common atoms. The shortest Lu-Lu distances are 5.703. The LuP5O14 ultraphosphate is isostructural with YbP5O14 (Hong & Pierce, 1974).