inorganic compounds\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

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ISSN: 2056-9890

The cyclo-tetra­phosphate Cd2P4O12, a member of the isotypic series M2P4O12 (M = Mg, Mn, Fe, Co, Ni, Cu)

aInstitute for Chemical Technologies and Analytics, Division of Structural Chemistry, Vienna University of Technology, Getreidemarkt 9/164-SC, A-1060 Vienna, Austria
*Correspondence e-mail: mweil@mail.zserv.tuwien.ac.at

(Received 1 October 2010; accepted 7 October 2010; online 13 October 2010)

The title compound, Cd2P4O12, dicadmium cyclo-tetra­phosphate, crystallizes isotypically with the members of the series MII2P4O12, where M = Mg, Mn, Fe, Co, Ni or Cu. Two CdO6 octa­hedra, one with 2 and one with [\overline{1}] symmetry, share corners with the centrosymmetric P4O124− ring anion that is built up from four corner-sharing PO4 tetra­hedra. The isolated ring anions are arranged in layers parallel to (10[\overline{1}]) with the CdO6 octa­hedra situated between these layers. The main difference between the individual MII2P4O12 structures pertains to the different sizes of the MO6 octa­hedra whereas the geometric parameters of all cyclo-P4O124− anions are very similar.

Related literature

For a previous powder X-ray study of Cd2P4O12, see: Laügt et al. (1973[Laügt, M., Durif, A. & Averbouch-Pouchot, M.-T. (1973). Bull. Soc. Fr. Minéral. Cristallogr. 96, 383-385.]). The structure of the low-temperature α-modification of the catena-polyphosphate Cd(PO3)2 was refined by Bagieu-Beucher et al. (1974[Bagieu-Beucher, M., Guitel, J. C., Tordjman, I. & Durif, A. (1974). Bull. Soc. Fr. Minéral. Cristallogr. 97, 481-484.]). For isotypic MII2P4O12 structures, see: Nord & Lindberg (1975[Nord, A. G. & Lindberg, K. B. (1975). Acta Chem. Scand. Ser. A, 29, 1-6.]) for M = Mg; Glaum et al. (2002[Glaum, R., Thauern, H., Schmidt, A. & Gerk, M. (2002). Z. Anorg. Allg. Chem. 628, 2800-2808.]) for Mn; Nord et al. (1990[Nord, A. G., Ericsson, T. & Werner, P. E. (1990). Z. Kristallogr. 192, 83-90.]) and Genkina et al. (1985[Genkina, E. A., Maksimov, B. A. & Mel'nikov, O. K. (1985). Kristallografiya, 30, 885-889.]) for Fe; Nord (1982[Nord, A. G. (1982). Cryst. Struct. Commun. 11, 1467-1474.]) and Olbertz et al. (1998[Olbertz, A., Stachel, D., Svoboda, I. & Fuess, H. (1998). Z. Kristallogr. New Cryst. Struct. 213, 241-242.]) for Co; Nord (1983[Nord, A. G. (1983). Acta Chem. Scand. Ser. A, 37, 539-543.]) and Olbertz et al. (1998[Olbertz, A., Stachel, D., Svoboda, I. & Fuess, H. (1998). Z. Kristallogr. New Cryst. Struct. 213, 241-242.]) for Ni; Laügt et al. (1972[Laügt, M., Guitel, J. C., Tordjman, I. & Bassi, G. (1972). Acta Cryst. B28, 201-208.]) for Cu. A review on the crystal chemistry of phosphates was published by Durif (1995[Durif, A. (1995). Crystal Chemistry of Condensed Phosphates. New York and London: Plenum Press.]). Ionic radii were compiled by Shannon (1976[Shannon, R. D. (1976). Acta Cryst. A32, 751-767.]).

Experimental

Crystal data
  • Cd2P4O12

  • Mr = 540.68

  • Monoclinic, C 2/c

  • a = 12.3342 (2) Å

  • b = 8.6373 (2) Å

  • c = 10.4037 (2) Å

  • β = 119.402 (1)°

  • V = 965.59 (3) Å3

  • Z = 4

  • Mo Kα radiation

  • μ = 5.13 mm−1

  • T = 296 K

  • 0.36 × 0.24 × 0.12 mm

Data collection
  • Bruker APEXII CCD diffractometer

  • Absorption correction: multi-scan (SADABS; Bruker, 2008[Bruker (2008). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.]) Tmin = 0.260, Tmax = 0.578

  • 11480 measured reflections

  • 3001 independent reflections

  • 2936 reflections with I > 2σ(I)

  • Rint = 0.036

Refinement
  • R[F2 > 2σ(F2)] = 0.023

  • wR(F2) = 0.054

  • S = 1.23

  • 3001 reflections

  • 85 parameters

  • Δρmax = 2.08 e Å−3

  • Δρmin = −1.04 e Å−3

Table 1
Selected bond lengths (Å)

Cd1—O1i 2.1875 (12)
Cd1—O6 2.3034 (10)
Cd1—O2ii 2.3690 (11)
Cd2—O5iii 2.2037 (12)
Cd2—O6 2.2563 (11)
Cd2—O2 2.2809 (11)
P1—O1 1.4624 (12)
P1—O2 1.5052 (11)
P1—O3iv 1.5840 (12)
P1—O4 1.5983 (11)
P2—O5 1.4604 (12)
P2—O6 1.5011 (11)
P2—O3 1.5848 (12)
P2—O4 1.5918 (12)
Symmetry codes: (i) [x+{\script{1\over 2}}, y+{\script{1\over 2}}, z]; (ii) [-x+{\script{1\over 2}}, -y+{\script{1\over 2}}, -z]; (iii) [-x+{\script{1\over 2}}, y-{\script{1\over 2}}, -z+{\script{1\over 2}}]; (iv) -x, -y+1, -z.

Data collection: APEX2 (Bruker, 2008[Bruker (2008). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.]); cell refinement: SAINT (Bruker, 2008[Bruker (2008). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.]); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); molecular graphics: ATOMS for Windows (Dowty, 2006[Dowty, E. (2006). ATOMS for Windows. Shape Software, Kingsport, Tennessee, USA.]); software used to prepare material for publication: SHELXL97.

Supporting information


Comment top

MII2P4O12 compounds containing the cyclo-tetraphosphate anion P4O124- have been the subject of numerous crystallographic studies. Except for Cd2P4O12 (X-ray powder data; Laügt et al., 1973), detailed structure data are available for Mg2P4O12 (Nord & Lindberg, 1975), Mn2P4O12 (Glaum et al., 2002), Fe2P4O12 (Nord et al., 1990; Genkina et al., 1985), Co2P4O12 (Nord, 1982; Olbertz et al., 1998), Ni2P4O12 (Nord, 1983; Olbertz et al., 1998) and Cu2P4O12 (Laügt et al., 1972). During experiments intended for crystal growth of large single crystals of the low-temperature modification of cadmium catena-polyphosphate, α-Cd(PO3)2 (Bagieu-Beucher et al., 1974), single crystals of the title compound were obtained instead.

The crystal structures of the isotypic MII2P4O12 family are built up from centrosymmetric P4O124- ring anions. The isolated anions are arranged in layers parallel to (101). Two sets of slightly distorted MO6 octahedra, one with 1 symmetry and one with 2 symmetry, share edges and are situated in the interlayer space. The three-dimensional framework is accomplished by corner-sharing of the MO6 units and the P4O124- anions. Figures 1 and 2 show the resulting arrangement for Cd2P4O12.

The P4O124- ring anion of Cd2P4O12 (Fig. 3) consists of four corner-sharing PO4 tetrahedra and shows the typical features with respect to bond lengths and angles, i.e. shorter terminal P—O bonds and longer P—O bonds to the bridging O atoms. A review on structures containing the cyclo-tetraphosphate anion has been given by Durif (1995) where characteristic distances and angles are compiled. The individual bond lengths and angles of the P4O124- anions are very similar in all MII2P4O12 structures. The main difference between the structures is related to the varying ionic radii of the MII cations. Correspondingly, the MO6 octahedra show (slight) variations in the M—O bond lengths. In the MII2P4O12 family (M = Mg, Mn, Fe, Co, Ni, Cu, and Cd), CdII has the largest ionic radius (0.95 Å) for coordination number 6 (Shannon, 1976). This value seems to be the upper limit for the existence of the MII2P4O12 family of structures. For larger MII cations like HgII or PbII (ionic radius 1.02 Å and 1.19 Å, respectively) solely long-chain catena-polyphosphate structures M(PO3)2 are realised.

In the review on condensed phosphates given by Durif it was stated that cyclo-Cd2P4O12 transforms irreversibly into the low-temperature α-modification of the long-chain polyphosphate Cd(PO3)2 by prolonged heating at 573 K (Durif, 1995, and references therein), indicating that this transformation process is kinetically controlled. This assumption is confirmed by DSC (differential scanning calorimetry) measurements of the current sample (N2 atmosphere, heating rate 10 K.min-1). Whereas no phase transition has been observed for this compound up to 873 K under these conditions, heating the sample at 873 K in a laboratory furnace under atmospheric conditions for 20 h resulted in a complete transformation into α-Cd(PO3)2.

Related literature top

For a previous powder X-ray study of Cd2P4O12, see: Laügt et al. (1973). The structure of the low-temperature α-modification of the catena-polyphosphate Cd(PO3)2 was refined by Bagieu-Beucher et al. (1974). For isotypic MII2P4O12 structures, see: Nord & Lindberg (1975) for M = Mg; Glaum et al. (2002) for Mn; Nord et al. (1990) and Genkina et al. (1985) for Fe; Nord (1982) and Olbertz et al. (1998) for Co; Nord (1983) and Olbertz et al. (1998) for Ni; Laügt et al. (1972) for Cu. A review on the crystal chemistry of phosphates was published by Durif (1995). Ionic radii were compiled by Shannon (1976).

Experimental top

Single crystals suitable for X-ray structure analysis were grown using the phosphate flux method. CdO (0.7 g) was placed in a glassy carbon crucible and was covered carefully with 70%wt H3PO4 (5.4 g). The crucible was subjected to the following temperature programme: RT 693 K [3 h] 693 K [5 h] 573 K [48 h]. Then the crucible was removed from the furnace. Prismatic colourless crystals with maximum edge lengths of 1.5 mm were obtained by leaching the phosphate flux with warm water.

Refinement top

The highest peak in the final Fourier map is located 0.62 Å from Cd2 and the deepest hole is 0.96 Å from the same atom.

Structure description top

MII2P4O12 compounds containing the cyclo-tetraphosphate anion P4O124- have been the subject of numerous crystallographic studies. Except for Cd2P4O12 (X-ray powder data; Laügt et al., 1973), detailed structure data are available for Mg2P4O12 (Nord & Lindberg, 1975), Mn2P4O12 (Glaum et al., 2002), Fe2P4O12 (Nord et al., 1990; Genkina et al., 1985), Co2P4O12 (Nord, 1982; Olbertz et al., 1998), Ni2P4O12 (Nord, 1983; Olbertz et al., 1998) and Cu2P4O12 (Laügt et al., 1972). During experiments intended for crystal growth of large single crystals of the low-temperature modification of cadmium catena-polyphosphate, α-Cd(PO3)2 (Bagieu-Beucher et al., 1974), single crystals of the title compound were obtained instead.

The crystal structures of the isotypic MII2P4O12 family are built up from centrosymmetric P4O124- ring anions. The isolated anions are arranged in layers parallel to (101). Two sets of slightly distorted MO6 octahedra, one with 1 symmetry and one with 2 symmetry, share edges and are situated in the interlayer space. The three-dimensional framework is accomplished by corner-sharing of the MO6 units and the P4O124- anions. Figures 1 and 2 show the resulting arrangement for Cd2P4O12.

The P4O124- ring anion of Cd2P4O12 (Fig. 3) consists of four corner-sharing PO4 tetrahedra and shows the typical features with respect to bond lengths and angles, i.e. shorter terminal P—O bonds and longer P—O bonds to the bridging O atoms. A review on structures containing the cyclo-tetraphosphate anion has been given by Durif (1995) where characteristic distances and angles are compiled. The individual bond lengths and angles of the P4O124- anions are very similar in all MII2P4O12 structures. The main difference between the structures is related to the varying ionic radii of the MII cations. Correspondingly, the MO6 octahedra show (slight) variations in the M—O bond lengths. In the MII2P4O12 family (M = Mg, Mn, Fe, Co, Ni, Cu, and Cd), CdII has the largest ionic radius (0.95 Å) for coordination number 6 (Shannon, 1976). This value seems to be the upper limit for the existence of the MII2P4O12 family of structures. For larger MII cations like HgII or PbII (ionic radius 1.02 Å and 1.19 Å, respectively) solely long-chain catena-polyphosphate structures M(PO3)2 are realised.

In the review on condensed phosphates given by Durif it was stated that cyclo-Cd2P4O12 transforms irreversibly into the low-temperature α-modification of the long-chain polyphosphate Cd(PO3)2 by prolonged heating at 573 K (Durif, 1995, and references therein), indicating that this transformation process is kinetically controlled. This assumption is confirmed by DSC (differential scanning calorimetry) measurements of the current sample (N2 atmosphere, heating rate 10 K.min-1). Whereas no phase transition has been observed for this compound up to 873 K under these conditions, heating the sample at 873 K in a laboratory furnace under atmospheric conditions for 20 h resulted in a complete transformation into α-Cd(PO3)2.

For a previous powder X-ray study of Cd2P4O12, see: Laügt et al. (1973). The structure of the low-temperature α-modification of the catena-polyphosphate Cd(PO3)2 was refined by Bagieu-Beucher et al. (1974). For isotypic MII2P4O12 structures, see: Nord & Lindberg (1975) for M = Mg; Glaum et al. (2002) for Mn; Nord et al. (1990) and Genkina et al. (1985) for Fe; Nord (1982) and Olbertz et al. (1998) for Co; Nord (1983) and Olbertz et al. (1998) for Ni; Laügt et al. (1972) for Cu. A review on the crystal chemistry of phosphates was published by Durif (1995). Ionic radii were compiled by Shannon (1976).

Computing details top

Data collection: APEX2 (Bruker, 2008); cell refinement: SAINT (Bruker, 2008); data reduction: SAINT (Bruker, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ATOMS for Windows (Dowty, 2006); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. The crystal structure of Cd2P4O12 in a projection along [001]. PO4 tetrahedra are red, CdO6 octahedra are blue and O atoms are displayed as white spheres.
[Figure 2] Fig. 2. The crystal structure of Cd2P4O12 in a projection along [010]. Colour code as in Fig. 1.
[Figure 3] Fig. 3. The P4O12 ring anion with displacement ellipsoids drawn at the 99% level. Non-labelled atoms are generated by inversion symmetry. [Symmetry code: (viii) -x, -y + 1, -z.]
dicadmium cyclo-tetraphosphate top
Crystal data top
Cd2P4O12F(000) = 1008
Mr = 540.68Dx = 3.719 Mg m3
Monoclinic, C2/cMo Kα radiation, λ = 0.71073 Å
Hall symbol: -C 2ycCell parameters from 9733 reflections
a = 12.3342 (2) Åθ = 3.0–40.1°
b = 8.6373 (2) ŵ = 5.13 mm1
c = 10.4037 (2) ÅT = 296 K
β = 119.402 (1)°Fragment, colourless
V = 965.59 (3) Å30.36 × 0.24 × 0.12 mm
Z = 4
Data collection top
Bruker APEXII CCD
diffractometer
3001 independent reflections
Radiation source: fine-focus sealed tube2936 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.036
ω and φ scansθmax = 40.1°, θmin = 3.0°
Absorption correction: multi-scan
(SADABS; Bruker, 2008)
h = 2222
Tmin = 0.260, Tmax = 0.578k = 1315
11480 measured reflectionsl = 1818
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.023 w = 1/[σ2(Fo2) + (0.0182P)2 + 0.873P]
where P = (Fo2 + 2Fc2)/3
wR(F2) = 0.054(Δ/σ)max = 0.001
S = 1.23Δρmax = 2.08 e Å3
3001 reflectionsΔρmin = 1.04 e Å3
85 parametersExtinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4
0 restraintsExtinction coefficient: 0.0306 (6)
Crystal data top
Cd2P4O12V = 965.59 (3) Å3
Mr = 540.68Z = 4
Monoclinic, C2/cMo Kα radiation
a = 12.3342 (2) ŵ = 5.13 mm1
b = 8.6373 (2) ÅT = 296 K
c = 10.4037 (2) Å0.36 × 0.24 × 0.12 mm
β = 119.402 (1)°
Data collection top
Bruker APEXII CCD
diffractometer
3001 independent reflections
Absorption correction: multi-scan
(SADABS; Bruker, 2008)
2936 reflections with I > 2σ(I)
Tmin = 0.260, Tmax = 0.578Rint = 0.036
11480 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.02385 parameters
wR(F2) = 0.0540 restraints
S = 1.23Δρmax = 2.08 e Å3
3001 reflectionsΔρmin = 1.04 e Å3
Special details top

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
Cd10.50000.463931 (16)0.25000.01089 (4)
Cd20.25000.25000.00000.00995 (4)
P10.01063 (3)0.27016 (4)0.02086 (4)0.00915 (6)
P20.18879 (3)0.50069 (4)0.19159 (3)0.00957 (6)
O10.04856 (12)0.13811 (15)0.07757 (14)0.0192 (2)
O20.04150 (11)0.24122 (13)0.08092 (13)0.01274 (17)
O30.12504 (11)0.61475 (16)0.05498 (13)0.0208 (2)
O40.08602 (11)0.37174 (16)0.15789 (13)0.0188 (2)
O50.21814 (13)0.57449 (17)0.33127 (13)0.0203 (2)
O60.29305 (9)0.42682 (14)0.17838 (12)0.01323 (16)
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Cd10.01110 (6)0.00998 (7)0.01157 (6)0.0000.00555 (4)0.000
Cd20.01135 (6)0.01049 (7)0.00858 (6)0.00011 (3)0.00534 (4)0.00030 (3)
P10.01011 (12)0.00779 (13)0.01007 (12)0.00002 (9)0.00536 (9)0.00080 (9)
P20.00955 (12)0.00927 (14)0.00907 (11)0.00068 (10)0.00393 (9)0.00214 (9)
O10.0242 (5)0.0138 (5)0.0198 (4)0.0032 (4)0.0111 (4)0.0051 (4)
O20.0118 (4)0.0150 (5)0.0129 (4)0.0001 (3)0.0072 (3)0.0029 (3)
O30.0209 (5)0.0247 (6)0.0205 (5)0.0139 (4)0.0132 (4)0.0109 (4)
O40.0198 (4)0.0225 (5)0.0176 (4)0.0106 (4)0.0120 (4)0.0095 (4)
O50.0245 (5)0.0202 (6)0.0146 (4)0.0011 (4)0.0084 (4)0.0098 (4)
O60.0102 (3)0.0129 (4)0.0156 (4)0.0016 (3)0.0056 (3)0.0030 (3)
Geometric parameters (Å, º) top
Cd1—O1i2.1875 (12)Cd2—Cd1iv3.4370
Cd1—O1ii2.1875 (12)P1—O11.4624 (12)
Cd1—O6iii2.3034 (10)P1—O21.5052 (11)
Cd1—O62.3034 (10)P1—O3viii1.5840 (12)
Cd1—O2iv2.3690 (11)P1—O41.5983 (11)
Cd1—O2v2.3690 (11)P2—O51.4604 (12)
Cd1—Cd23.4370P2—O61.5011 (11)
Cd1—Cd2iii3.4370P2—O31.5848 (12)
Cd2—O5vi2.2037 (12)P2—O41.5918 (12)
Cd2—O5vii2.2037 (12)O1—Cd1ix2.1875 (12)
Cd2—O6iv2.2563 (11)O2—Cd1iv2.3690 (11)
Cd2—O62.2563 (11)O3—P1viii1.5840 (12)
Cd2—O2iv2.2809 (11)O5—Cd2i2.2037 (12)
Cd2—O22.2809 (11)
O1i—Cd1—O1ii93.10 (7)O5vii—Cd2—O290.06 (5)
O1i—Cd1—O6iii90.95 (4)O6iv—Cd2—O284.63 (4)
O1ii—Cd1—O6iii100.06 (4)O6—Cd2—O295.37 (4)
O1i—Cd1—O6100.06 (4)O2iv—Cd2—O2180.00 (6)
O1ii—Cd1—O690.95 (4)O1—P1—O2119.08 (8)
O6iii—Cd1—O6164.00 (6)O1—P1—O3viii107.89 (8)
O1i—Cd1—O2iv174.69 (4)O2—P1—O3viii109.73 (6)
O1ii—Cd1—O2iv91.90 (5)O1—P1—O4108.33 (7)
O6iii—Cd1—O2iv86.40 (4)O2—P1—O4109.24 (6)
O6—Cd1—O2iv81.64 (4)O3viii—P1—O4101.05 (8)
O1i—Cd1—O2v91.90 (5)O5—P2—O6118.14 (7)
O1ii—Cd1—O2v174.69 (4)O5—P2—O3113.12 (8)
O6iii—Cd1—O2v81.64 (4)O6—P2—O3104.61 (6)
O6—Cd1—O2v86.40 (4)O5—P2—O4107.83 (7)
O2iv—Cd1—O2v83.17 (6)O6—P2—O4107.92 (7)
O5vi—Cd2—O5vii180.0O3—P2—O4104.28 (8)
O5vi—Cd2—O6iv93.87 (5)P1—O1—Cd1ix148.67 (8)
O5vii—Cd2—O6iv86.13 (5)P1—O2—Cd2121.90 (7)
O5vi—Cd2—O686.13 (5)P1—O2—Cd1iv129.45 (7)
O5vii—Cd2—O693.87 (5)Cd2—O2—Cd1iv95.30 (4)
O6iv—Cd2—O6180.00 (5)P1viii—O3—P2139.93 (8)
O5vi—Cd2—O2iv90.06 (5)P2—O4—P1138.17 (8)
O5vii—Cd2—O2iv89.94 (5)P2—O5—Cd2i162.37 (10)
O6iv—Cd2—O2iv95.37 (4)P2—O6—Cd2119.78 (6)
O6—Cd2—O2iv84.63 (4)P2—O6—Cd1140.75 (7)
O5vi—Cd2—O289.94 (5)Cd2—O6—Cd197.83 (4)
Symmetry codes: (i) x+1/2, y+1/2, z+1/2; (ii) x+1/2, y+1/2, z; (iii) x+1, y, z+1/2; (iv) x+1/2, y+1/2, z; (v) x+1/2, y+1/2, z+1/2; (vi) x+1/2, y1/2, z+1/2; (vii) x, y+1, z1/2; (viii) x, y+1, z; (ix) x1/2, y1/2, z.

Experimental details

Crystal data
Chemical formulaCd2P4O12
Mr540.68
Crystal system, space groupMonoclinic, C2/c
Temperature (K)296
a, b, c (Å)12.3342 (2), 8.6373 (2), 10.4037 (2)
β (°) 119.402 (1)
V3)965.59 (3)
Z4
Radiation typeMo Kα
µ (mm1)5.13
Crystal size (mm)0.36 × 0.24 × 0.12
Data collection
DiffractometerBruker APEXII CCD
Absorption correctionMulti-scan
(SADABS; Bruker, 2008)
Tmin, Tmax0.260, 0.578
No. of measured, independent and
observed [I > 2σ(I)] reflections
11480, 3001, 2936
Rint0.036
(sin θ/λ)max1)0.906
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.023, 0.054, 1.23
No. of reflections3001
No. of parameters85
Δρmax, Δρmin (e Å3)2.08, 1.04

Computer programs: APEX2 (Bruker, 2008), SAINT (Bruker, 2008), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ATOMS for Windows (Dowty, 2006).

Selected bond lengths (Å) top
Cd1—O1i2.1875 (12)P1—O21.5052 (11)
Cd1—O62.3034 (10)P1—O3iv1.5840 (12)
Cd1—O2ii2.3690 (11)P1—O41.5983 (11)
Cd2—O5iii2.2037 (12)P2—O51.4604 (12)
Cd2—O62.2563 (11)P2—O61.5011 (11)
Cd2—O22.2809 (11)P2—O31.5848 (12)
P1—O11.4624 (12)P2—O41.5918 (12)
Symmetry codes: (i) x+1/2, y+1/2, z; (ii) x+1/2, y+1/2, z; (iii) x+1/2, y1/2, z+1/2; (iv) x, y+1, z.
 

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