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  • 1
    Electronic Resource
    Electronic Resource
    Dieuropium(III) silicodimonophosphatediphosphate (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. i12-i14 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A new europium(III) silicophosphate, whose formula may be considered to be Eu2Si(PO4)2(P2O7), has been found to consist of phosphosilicate chains with Si—O—P—O—P—O—Si backbones extending in the a direction. The P2O7 group and the Si atom both lie on crystallographic twofold axes. Tetrahedral silicon is further bound to two monophosphate groups. This is a silicophosphate of previously unseen type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801001519
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  • 2
    Electronic Resource
    Electronic Resource
    Strontium dicobalt orthophosphate (1993)
    Springer
    Journal of chemical crystallography 23 (1993), S. 1001-1004 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract In crystalline SrCo2(PO4)2; triclinicP¯1,M r =395.4,a=5.014(2),b=8.639(4),c=9.691(1)Å,a=118.04(3),β=75.09(4), γ=86.90(4)°,V=350.4(3)Å3,Z=2,D calc=3.747 g cm−3, λMoKα=0.71069 Å,μ=12.49 mm−1,F(000)=372,T=298 K,R=4.1% for 1190 obs. reflections; Co2+ and PO 4 3− ions are found on planes parallel to (001). Co2+ occupies sites of four- and five-(trigonal bipyramidal) coordination with average Co-O distances, 1.948(8) and 2.087(8) Å, respectively. The blue color of solid is due to the tetrahedral coordination geometry of the four-coordinate copper atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185551
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  • 3
    Electronic Resource
    Electronic Resource
    Crystal structures of two allotropic forms of Na2CoP2O7 (1991)
    Springer
    Journal of chemical crystallography 21 (1991), S. 321-326 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Na2CoP2O7 may be prepared in two allotropie forms:I, rose,M r =278.85, triclinic, P1,a=9.735(2),b=10.940(3),c=12.289(4) Å,α=148.78,β=121.76(1), γ=68.38(2)°,V=566.8(2) Å3,Z=4,D meas=3.28(5) g cm−3,D calc=3.267 g cm−3, λ(MoKα)=0.71069 Å,μ=37.12 cm−1, F(000)=540,T=298 K,R=5.4% for 2911 observed reflections; andII, blue,M r =278.85, orthorhombic, P21cn,a=7.713(2) Å,b=10.271(4),c=15.378(6)°,V=1218.2(8) Å3,Z=8,D meas=3.06(5) g cm−3,D calc=3.040 g cm−1, λ(MoK α) Å,μ=34.55 cm−1, F(000)=1080,T=298 K,R=9.9% for 1450 observed reflections. Cobalt displays octahedral coordination to six oxygen atoms in the rose form whereas the metal coordination is tetrahedral in the blue form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01156084
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  • 4
    Electronic Resource
    Electronic Resource
    Identification of a new family of diphosphate compounds, AI2BII3(P2O7)2: Structures of Ag2Co3(P2O7)2, Ag2Mn3(P2O7)2, and Na2Cd3(P2O7)2 (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 705-716 
    Details
    ISSN: 1572-8854
    Keywords: mixed metal diphosphates ; AI 2BII 3(P2O7)2 ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Syntheses and single-crystal X-ray structural results are reported for three new mixed diphosphates of the family AI 2BII 3(P2O7)2; Ag2Co3(P2O7)2 (I), Ag2Mn3(P2O7)2 (II), and Na2Cd3(P2O7)2 (III). All crystallize in the triclinic system, space group P1 bar: (I) a = 5.351(4), b = 6.375(4), c = 16.532(4) Å, α = 80.83(6) β = 81.45(4), γ = 72.87(5)°, V = 528.9(6) Å3, Z = 2, D calc = 4.649 mg/m3, R/Rw = 0.0428/0.0548 for 3949 obs. reflns; (II) a = 5.432(7), b = 6.619(6), c = 16.51(3) Å, α = 80.78(8) β = 82.43(9), γ = 72.82(7)°, V = 557.7(13) Å3, Z = 2, D calc = 4.338 mg/m3, R/Rw = 0.0679/0.1303 for 2100 obs. reflns and (III) a = 5.67(3), b = 7.08(4), c = 7.90(4) Å, α = 77.0(2), β = 82.5(2), γ = 67.8(2)°, V = 286(3) Å3, Z = 2, D calc = 4.249 mg/m3, R/Rw = 0.0307/0.0342 for 1945 obs. reflns. (I) and (II) are isostructural but (III) is of a different type. All three structures are characterized by layers of P2O7 groups alternating with layers of mixed metal atoms. Differences are seen in the conglomerate bonding patterns of B atoms and in the irregular geometry of Ag in (I) and (II) compared to the octahedral bonding seen for Na in (III). The differences in structure may be understood in terms of the ratios of the ionic radii of A and B atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012294026877
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