Acta Cryst. (2009). E65, i13 [ doi:10.1107/S1600536809004085 ]
Europium(III) silver polyphosphate, AgEu(PO3)4, was prepared by the flux method. The atomic arrangement is built up by infinite (PO3)n chains (periodicity of 4) extending along the c axis. These chains are joined to each other by EuO8 dodecahedra. The Ag+ cations are located in the voids of this arrangement and are surrounded by five oxygen atoms in a distorted [4+1] coordination.
Single crystals of AgEu(PO3)4 were prepared by flux method. A mixture of Ag2CO3 (3 g), EuCl3.6H2O (0.5 g) and H3PO4(85%, 17 ml), was progressively heated in a vitreous carbon crucible to 473 K for 12 h. The temperature was then raised and kept at 600 K for 16 days after that, the furnance was slowly cooled until the room temperature. The product was washed with boiling water to separate colorless single crystals from phosphoric acid.
The highest peak and the deepest hole are located 1.22Å and 0.73 Å, respectively, from Ag and Eu.
Data collection: COLLECT (Nonius, 2001); cell refinement: DENZO/SCALEPACK (Otwinowski & Minor, 1997); data reduction: DENZO/SCALEPACK (Otwinowski & Minor, 1997); program(s) used to solve structure: SHELXS08 (Sheldrick, 2008); program(s) used to refine structure: SHELXL08 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 1998); software used to prepare material for publication: SHELXL08 (Sheldrick, 2008).
![[Figure 1]](./br2089fig1thm.gif)
| Fig. 1. : The structural arrangement of AgEu(PO3)4 along a axis. |
![[Figure 2]](./br2089fig2thm.gif)
| Fig. 2. : Projection of EuO8 dodecahedra viewed along [0 0 1] direction. |
![[Figure 3]](./br2089fig3thm.gif)
| Fig. 3. : The sequence of PO4 tetrahedra in AgEu(PO3)4, with displacement ellipsoids drawn at the 50% probability level. [Symmetry codes: (i) 1-x, 2-y, 2-z; (ii) 1-x/2, 2-y, 3-z] |
| AgEu(PO3)4 | F000 = 1064 |
| Mr = 575.72 | Dx = 4.037 Mg m−3 |
| Monoclinic, P21/n | Mo Kα radiation λ = 0.71073 Å |
| Hall symbol: -P 2yn | Cell parameters from 25 reflections |
| a = 9.9654 (3) Å | θ = 2.4–30.1º |
| b = 13.1445 (7) Å | µ = 9.37 mm−1 |
| c = 7.2321 (3) Å | T = 298 K |
| β = 90.42 (1)º | Prism, colorless |
| V = 947.31 (7) Å3 | 0.19 × 0.18 × 0.17 mm |
| Z = 4 |
| Nonius KappaCCD diffractometer | 2019 independent reflections |
| Radiation source: fine-focus sealed tube | 1704 reflections with I > 2σ(I) |
| Monochromator: graphite | Rint = 0.042 |
| T = 298 K | θmax = 27.5º |
| φ and ω scans | θmin = 3.8º |
| Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −12→12 |
| Tmin = 0.167, Tmax = 0.201 | k = −16→15 |
| 3371 measured reflections | l = −9→9 |
| Refinement on F2 | Secondary atom site location: difference Fourier map |
| Least-squares matrix: full | w = 1/[σ2(Fo2) + (0.0685P)2 + 1.0941P] where P = (Fo2 + 2Fc2)/3 |
| R[F2 > 2σ(F2)] = 0.042 | (Δ/σ)max < 0.001 |
| wR(F2) = 0.109 | Δρmax = 2.43 e Å−3 |
| S = 1.03 | Δρmin = −2.06 e Å−3 |
| 2019 reflections | Extinction correction: SHELXL08 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
| 164 parameters | Extinction coefficient: 0.00014 (2) |
| Primary atom site location: structure-invariant direct methods |
| AgEu(PO3)4 | V = 947.31 (7) Å3 |
| Mr = 575.72 | Z = 4 |
| Monoclinic, P21/n | Mo Kα |
| a = 9.9654 (3) Å | µ = 9.37 mm−1 |
| b = 13.1445 (7) Å | T = 298 K |
| c = 7.2321 (3) Å | 0.19 × 0.18 × 0.17 mm |
| β = 90.42 (1)º |
| Nonius KappaCCD diffractometer | 2019 independent reflections |
| Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 1704 reflections with I > 2σ(I) |
| Tmin = 0.167, Tmax = 0.201 | Rint = 0.042 |
| 3371 measured reflections |
| R[F2 > 2σ(F2)] = 0.042 | 164 parameters |
| wR(F2) = 0.109 | Δρmax = 2.43 e Å−3 |
| S = 1.03 | Δρmin = −2.06 e Å−3 |
| 2019 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 | ||
| Eu | 0.52254 (4) | 0.78212 (2) | 0.51227 (4) | 0.01862 (19) | |
| Ag | 0.43355 (7) | 0.77670 (5) | 1.00017 (8) | 0.0322 (2) | |
| P1 | 0.25190 (18) | 0.90008 (12) | 1.2536 (2) | 0.0168 (4) | |
| P2 | 0.19511 (18) | 0.87338 (12) | 1.6486 (2) | 0.0167 (4) | |
| P3 | 0.79921 (18) | 0.90983 (12) | 1.2635 (2) | 0.0172 (4) | |
| P4 | 0.73739 (18) | 0.88594 (12) | 0.8738 (2) | 0.0162 (4) | |
| O1 | 0.1995 (5) | 0.8356 (3) | 1.1018 (6) | 0.0241 (11) | |
| O2 | 0.3997 (5) | 0.8951 (4) | 1.2904 (7) | 0.0243 (11) | |
| O3 | 0.2039 (5) | 1.0133 (3) | 1.2168 (7) | 0.0240 (11) | |
| O4 | 0.1629 (5) | 0.8769 (3) | 1.4335 (6) | 0.0198 (10) | |
| O5 | 0.3444 (5) | 0.8678 (4) | 1.6767 (7) | 0.0218 (10) | |
| O6 | 0.1062 (6) | 0.7906 (3) | 1.7231 (6) | 0.0228 (11) | |
| O7 | 0.8644 (5) | 1.0214 (3) | 1.2777 (7) | 0.0193 (10) | |
| O8 | 0.9144 (5) | 0.8395 (3) | 1.2329 (6) | 0.0236 (10) | |
| O9 | 0.7055 (5) | 0.8919 (3) | 1.4217 (6) | 0.0218 (10) | |
| O10 | 0.7085 (5) | 0.9202 (3) | 1.0822 (6) | 0.0203 (10) | |
| O11 | 0.8483 (5) | 0.8097 (3) | 0.8671 (7) | 0.0218 (10) | |
| O12 | 0.6047 (5) | 0.8557 (3) | 0.7933 (6) | 0.0198 (10) |
| U11 | U22 | U33 | U12 | U13 | U23 | |
| Eu | 0.0183 (3) | 0.0189 (2) | 0.0186 (2) | −0.00063 (12) | −0.00048 (15) | −0.00108 (12) |
| Ag | 0.0262 (4) | 0.0456 (4) | 0.0249 (3) | 0.0034 (2) | 0.0008 (2) | −0.0088 (2) |
| P1 | 0.0201 (9) | 0.0138 (7) | 0.0165 (7) | −0.0001 (6) | 0.0005 (6) | 0.0001 (6) |
| P2 | 0.0173 (9) | 0.0155 (8) | 0.0173 (8) | 0.0007 (6) | −0.0001 (6) | −0.0002 (6) |
| P3 | 0.0206 (9) | 0.0143 (7) | 0.0168 (8) | 0.0004 (6) | −0.0017 (6) | −0.0002 (6) |
| P4 | 0.0162 (9) | 0.0160 (8) | 0.0165 (8) | −0.0001 (6) | −0.0020 (6) | −0.0012 (6) |
| O1 | 0.034 (3) | 0.019 (2) | 0.019 (2) | 0.004 (2) | −0.002 (2) | −0.0060 (19) |
| O2 | 0.023 (3) | 0.026 (2) | 0.023 (2) | 0.000 (2) | −0.002 (2) | −0.002 (2) |
| O3 | 0.028 (3) | 0.016 (2) | 0.028 (3) | 0.007 (2) | −0.004 (2) | 0.0052 (19) |
| O4 | 0.019 (3) | 0.025 (2) | 0.016 (2) | 0.0000 (19) | −0.0004 (18) | 0.0039 (18) |
| O5 | 0.017 (3) | 0.024 (2) | 0.025 (2) | 0.0021 (19) | −0.003 (2) | −0.007 (2) |
| O6 | 0.029 (3) | 0.021 (2) | 0.018 (2) | −0.005 (2) | 0.000 (2) | 0.0038 (18) |
| O7 | 0.013 (2) | 0.014 (2) | 0.031 (3) | −0.0005 (18) | 0.0063 (19) | −0.003 (2) |
| O8 | 0.027 (3) | 0.018 (2) | 0.026 (2) | 0.003 (2) | −0.001 (2) | −0.002 (2) |
| O9 | 0.027 (3) | 0.023 (2) | 0.016 (2) | −0.004 (2) | 0.0040 (19) | −0.0026 (18) |
| O10 | 0.017 (2) | 0.020 (2) | 0.024 (2) | 0.0009 (19) | −0.0016 (18) | −0.0023 (19) |
| O11 | 0.022 (3) | 0.018 (2) | 0.025 (2) | 0.007 (2) | −0.001 (2) | 0.002 (2) |
| O12 | 0.023 (3) | 0.021 (2) | 0.015 (2) | 0.005 (2) | −0.0053 (19) | −0.0005 (18) |
| Eu—O11i | 2.355 (5) | P2—O4 | 1.587 (5) |
| Eu—O12 | 2.390 (4) | P2—O7vi | 1.598 (5) |
| Eu—O9ii | 2.420 (5) | P3—O8 | 1.492 (5) |
| Eu—O5ii | 2.422 (5) | P3—O9 | 1.500 (5) |
| Eu—O1iii | 2.430 (5) | P3—O10 | 1.593 (5) |
| Eu—O6iv | 2.451 (5) | P3—O7 | 1.607 (5) |
| Eu—O2ii | 2.500 (5) | P4—O11 | 1.493 (5) |
| Eu—O8i | 2.508 (5) | P4—O12 | 1.495 (5) |
| Eu—Ag | 3.6453 (7) | P4—O3vii | 1.592 (5) |
| Eu—Agii | 3.8025 (7) | P4—O10 | 1.602 (5) |
| Ag—O8i | 2.470 (5) | O1—Euviii | 2.430 (5) |
| Ag—O12 | 2.503 (5) | O2—Euv | 2.500 (5) |
| Ag—O6iii | 2.511 (5) | O3—P4vii | 1.592 (5) |
| Ag—O1 | 2.570 (5) | O5—Euv | 2.422 (5) |
| Ag—Euv | 3.8025 (7) | O6—Euix | 2.451 (5) |
| P1—O1 | 1.479 (5) | O6—Agviii | 2.511 (5) |
| P1—O2 | 1.496 (6) | O7—P2vi | 1.598 (5) |
| P1—O3 | 1.585 (5) | O8—Agx | 2.470 (5) |
| P1—O4 | 1.609 (5) | O8—Eux | 2.508 (5) |
| P2—O5 | 1.502 (5) | O9—Euv | 2.420 (5) |
| P2—O6 | 1.505 (5) | O11—Eux | 2.355 (5) |
| O11i—Eu—O12 | 146.43 (17) | O12—Ag—Eu | 40.66 (10) |
| O11i—Eu—O9ii | 137.70 (16) | O6iii—Ag—Eu | 117.27 (12) |
| O12—Eu—O9ii | 74.62 (16) | O1—Ag—Eu | 119.92 (10) |
| O11i—Eu—O5ii | 85.21 (16) | O8i—Ag—Euv | 142.17 (11) |
| O12—Eu—O5ii | 69.01 (16) | O12—Ag—Euv | 114.81 (10) |
| O9ii—Eu—O5ii | 114.34 (16) | O6iii—Ag—Euv | 39.40 (11) |
| O11i—Eu—O1iii | 108.89 (17) | O1—Ag—Euv | 85.49 (10) |
| O12—Eu—O1iii | 77.74 (15) | Eu—Ag—Euv | 152.34 (2) |
| O9ii—Eu—O1iii | 84.55 (16) | O1—P1—O2 | 116.6 (3) |
| O5ii—Eu—O1iii | 134.29 (16) | O1—P1—O3 | 108.0 (3) |
| O11i—Eu—O6iv | 70.99 (18) | O2—P1—O3 | 111.5 (3) |
| O12—Eu—O6iv | 140.07 (18) | O1—P1—O4 | 107.3 (3) |
| O9ii—Eu—O6iv | 74.93 (16) | O2—P1—O4 | 113.3 (3) |
| O5ii—Eu—O6iv | 148.82 (17) | O3—P1—O4 | 98.4 (3) |
| O1iii—Eu—O6iv | 74.24 (16) | O5—P2—O6 | 120.1 (3) |
| O11i—Eu—O2ii | 70.26 (16) | O5—P2—O4 | 109.1 (3) |
| O12—Eu—O2ii | 117.94 (15) | O6—P2—O4 | 104.9 (3) |
| O9ii—Eu—O2ii | 80.70 (17) | O5—P2—O7vi | 111.5 (3) |
| O5ii—Eu—O2ii | 71.45 (17) | O6—P2—O7vi | 106.6 (3) |
| O1iii—Eu—O2ii | 154.17 (16) | O4—P2—O7vi | 103.2 (3) |
| O6iv—Eu—O2ii | 81.49 (16) | O8—P3—O9 | 120.0 (3) |
| O11i—Eu—O8i | 68.78 (16) | O8—P3—O10 | 111.3 (3) |
| O12—Eu—O8i | 82.12 (15) | O9—P3—O10 | 106.8 (3) |
| O9ii—Eu—O8i | 151.72 (16) | O8—P3—O7 | 105.3 (3) |
| O5ii—Eu—O8i | 70.38 (16) | O9—P3—O7 | 110.4 (3) |
| O1iii—Eu—O8i | 74.87 (16) | O10—P3—O7 | 101.6 (3) |
| O6iv—Eu—O8i | 116.40 (15) | O11—P4—O12 | 117.5 (3) |
| O2ii—Eu—O8i | 125.20 (17) | O11—P4—O3vii | 105.7 (3) |
| O11i—Eu—Ag | 103.74 (12) | O12—P4—O3vii | 112.8 (3) |
| O12—Eu—Ag | 43.03 (12) | O11—P4—O10 | 111.0 (3) |
| O9ii—Eu—Ag | 117.57 (11) | O12—P4—O10 | 106.1 (3) |
| O5ii—Eu—Ag | 49.41 (11) | O3vii—P4—O10 | 102.9 (3) |
| O1iii—Eu—Ag | 84.88 (11) | P1—O1—Euviii | 144.5 (3) |
| O6iv—Eu—Ag | 154.81 (10) | P1—O1—Ag | 93.9 (3) |
| O2ii—Eu—Ag | 120.77 (12) | Euviii—O1—Ag | 112.98 (17) |
| O8i—Eu—Ag | 42.51 (10) | P1—O2—Euv | 128.1 (3) |
| O11i—Eu—Agii | 52.44 (12) | P1—O3—P4vii | 137.7 (4) |
| O12—Eu—Agii | 155.75 (11) | P2—O4—P1 | 133.6 (3) |
| O9ii—Eu—Agii | 85.32 (11) | P2—O5—Euv | 133.2 (3) |
| O5ii—Eu—Agii | 108.69 (11) | P2—O6—Euix | 142.4 (3) |
| O1iii—Eu—Agii | 114.28 (11) | P2—O6—Agviii | 115.3 (2) |
| O6iv—Eu—Agii | 40.55 (12) | Euix—O6—Agviii | 100.06 (18) |
| O2ii—Eu—Agii | 43.64 (11) | P2vi—O7—P3 | 131.3 (3) |
| O8i—Eu—Agii | 120.64 (11) | P3—O8—Agx | 108.8 (3) |
| Ag—Eu—Agii | 152.34 (2) | P3—O8—Eux | 145.5 (3) |
| O8i—Ag—O12 | 80.67 (15) | Agx—O8—Eux | 94.16 (15) |
| O8i—Ag—O6iii | 109.46 (15) | P3—O9—Euv | 140.7 (3) |
| O12—Ag—O6iii | 93.64 (16) | P3—O10—P4 | 130.2 (3) |
| O8i—Ag—O1 | 110.19 (16) | P4—O11—Eux | 150.8 (3) |
| O12—Ag—O1 | 132.06 (14) | P4—O12—Eu | 137.3 (3) |
| O6iii—Ag—O1 | 122.79 (16) | P4—O12—Ag | 118.8 (2) |
| O8i—Ag—Eu | 43.33 (11) | Eu—O12—Ag | 96.31 (16) |
| Symmetry codes: (i) x−1/2, −y+3/2, z−1/2; (ii) x, y, z−1; (iii) x+1/2, −y+3/2, z−1/2; (iv) x+1/2, −y+3/2, z−3/2; (v) x, y, z+1; (vi) −x+1, −y+2, −z+3; (vii) −x+1, −y+2, −z+2; (viii) x−1/2, −y+3/2, z+1/2; (ix) x−1/2, −y+3/2, z+3/2; (x) x+1/2, −y+3/2, z+1/2. |
Averbuch-Pouchot, M. T. & Bagieu Beucher, M. (1987). Z. Anorg. Allg. Chem. 552, 171–180.
Brandenburg, K. (1998). DIAMOND. University of Bonn, Germany.
Durif, A. (1995). In Crystal Chemistry of Condensed Phosphates. New York: Plenium Press.
Férid, M. (2006). In Etude des propriétés cristallochimiques et physiques des phosphates condensés de terres rares. Paris: Publibook
Hashimoto, N., Takada, Y., Sato, K. & Ibuki, S. (1991). J. Lumin. 48–49, 893–897.
Horchani, K., Gâcon, J. C., Férid, M., Trabelsi-Ayadi, M., Krachni, G. K. & liu, G. K. (2003). Opt. Mater. 24, 169–174.
Nonius (2001). COLLECT. Nonius BV, Delf, The Netherlands.
Otwinowski, Z. & Minor, W. (1997). Methods in Enzymology, Vol. 276, Macromolecular Crystallography, Part A, edited by C. W. Carter Jr & R. M. Sweet, pp. 307–326. New York: Academic Press.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122.
Trunov, V. K., Anisimova, N. Yu., Karmanovskaya, N. B. & Chudinova, N. N. (1990). Izv. Akad. Nauk SSSR, Neorg. Mater. 26, 1288–1290.
Yamada, T., Otsuka, K. & Nakano, J. (1974). Appl. Phys. 45, 5096–5097.
In the last decades, investigation of the synthesis and characterization of rare earth polyphosphates has gained much attention due to their potential applications in diverse areas such as phosphors and laser materials (Yamada et al., 1974; Hashimoto et al., 1991; Horchani et al., 2003). In aim to study the condensed phosphates of rare earth and monovalent cations of general formula MILn(PO3)4 (with MI = monovalent cation)(Durif, 1995), (Ln = Eu, Er, Yb), we have synthesized single crystals of silver europium polyphosphate and investigated its crystalline structure. The atomic arrangement of this structure is characterized by a three-dimensional framework built of (PO3)n chains that are formed by corner-sharing of PO4 tetrahedra. Eu3+ and Ag+ cations alternate in the middle of four such chains with Eu—Ag distances of 3.64 (7) Å (figures 1,3). The EuO8 dodecahedra are isolated from each other and the distances Eu—O are arranged in interval 2.355 (5)- 2.508 (5)Å (figure 2). The polyphosphate chains display two types of distances, P—O terminal ranging from 1.479 (5) to 1.505 (5)Å and P—O bridging, ranging from 1.585 (5)to 1.609 (5)Å. These distances are comparable with those repoted for other condensed phosphates (Durif, 1995; Averbuch-Pouchot & Bagieu Beucher, 1987; Férid (2006). The structural study reported for silver neodymium polyphosphate AgNd(PO3)4 (Trunov et al., 1990) showed that the compound crystallize in the P21/n space group and has similar unit cell prameters compared to AgEu(PO3)4.