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首页> 外文期刊>Journal of chemical crystallography >Identification of a new family of diphosphate compounds, A_2~IB_3~(II)(P_2O_7)_2: Structures of Ag_2Co_3(P_2O_7)_2, Ag_2Mn_3(P_2O_7)_2, and Na_2Cd_3(P_2O_7)_2
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Identification of a new family of diphosphate compounds, A_2~IB_3~(II)(P_2O_7)_2: Structures of Ag_2Co_3(P_2O_7)_2, Ag_2Mn_3(P_2O_7)_2, and Na_2Cd_3(P_2O_7)_2

机译：鉴定新的二磷酸盐化合物家族A_2〜IB_3〜（II）（P_2O_7）_2：Ag_2Co_3（P_2O_7）_2，Ag_2Mn_3（P_2O_7）_2和Na_2Cd_3（P_2O_7）_2的结构

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Syntheses and single-crystal X-ray structural results are reported for three new mixed diphosphates of the family A_2~IB_3~(II)(P_2O_7)_2; Ag_2Co_3(P_2O_7)_2 (I), Ag_2Mn_3(P_2O_7)_2 (II), and Na_2Cd_3(P_2O_7)_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) A, α = 80.83(6) β = 81.45(4), γ = 72.87(5)°, V = 528.9(6) A~3, Z = 2, D_(calc) = 4.649 mg/m~3, R/Rw = 0.0428/0.0548 for 3949 obs. reflns; (II) a = 5.432(7), b = 6.619(6), c = 16.51(3) A, α = 80.78(8) β = 82.43(9), γ = 72.82(7)°, V = 557.7(13) A~3, Z = 2, D_(calc) = 4.338 mg/m~3, R/Rw = 0.0679/0.1303 for 2100 obs. reflns and (III) a = 5.67(3), b = 7.08(4), c = 7.90(4) A, α = 77.0(2) β = 82.5(2), γ = 67.8(2)°, V = 286(3) A~3, Z = 2, D_(calc) = 4.249 mg/m~3, 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 P_2O_7 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.
机译：报道了A_2〜IB_3〜（II）（P_2O_7）_2族的三种新的混合二磷酸酯的合成和单晶X射线结构结果; Ag_2Co_3（P_2O_7）_2（I），Ag_2Mn_3（P_2O_7）_2（II）和Na_2Cd_3（P_2O_7）_2（III）。全部在三斜晶系中结晶，空间群P1 bar：（I）a = 5.351（4），b = 6.375（4），c = 16.532（4）A，α= 80.83（6）β= 81.45（4）， γ= 72.87（5）°，V = 528.9（6）A〜3，Z = 2，D_（calc）= 4.649 mg / m〜3，R / Rw = 0.0428 / 0.0548（3949磅）。反映（II）a = 5.432（7），b = 6.619（6），c = 16.51（3）A，α= 80.78（8）β= 82.43（9），γ= 72.82（7）°，V = 557.7（ 13）对于2100磅，A〜3，Z = 2，D_（计算）= 4.338 mg / m〜3，R / Rw = 0.0679 / 0.1303。反射和（III）a = 5.67（3），b = 7.08（4），c = 7.90（4）A，α= 77.0（2）β= 82.5（2），γ= 67.8（2）°，V = 286（3）A〜3，Z = 2，D_（计算）= 4.249 mg / m〜3，R / Rw = 0.0307 / 0.0342（1945磅）。反映（I）和（II）是同构的，但（III）是不同类型的。所有这三种结构的特征是P_2O_7基团层与混合金属原子层交替出现。与（III）中Na的八面体键合相比，在B原子的团聚体键合模式中以及（I）和（II）中Ag的不规则几何结构中可以看到差异。可以根据A和B原子的离子半径之比来理解结构上的差异。

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