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Synthesis, crystal structure, and vibrational spectroscopic and UV-visible studies o fCs2MnP2O7

Abstract : A new member of the A2MP2O7 diphosphate family, Cs2MnP2O7, has been synthesized and structurally characterized. The crystal structure was determined by single crystal X-Ray diffraction. Cs2MnP2O7 crystallizes in the orthorhombic system, space group Pnma (♯62), with the unit cell parameters a=16.3398(3), b=5.3872(1), c=9.8872(2) Å, Z=4 and V=870.33(3) Å3. The structure parameters were refined to a final R1/wR2=0.0194/0.0441 for 1650 observed reflections. The 2D framework of Cs2MnP2O7 structure consists of P2O7 and MnO5 units. The corner-shared MnO5 and P2O7 units are alternately arranged along the b axis to form [(MnO)P2O7]∞ chains. These chains are interconnected by an oxygen atom to form sheets parallel to the (b, c) plane. The cesium atoms are located between the sheets in 9- and 10-fold coordinated sites. The infrared and Raman vibrational spectra have been investigated. A factor group analysis leads to the determination of internal modes of (P2O7) groups. UV-visible spectrum consists of weak bands, between 340 and 700 nm, assigned to the forbidden d-d transitions of Mn2+ ion, and of a strong band around 250 nm, attributed to the OMn charge transfer.
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Submitted on : Wednesday, June 29, 2022 - 5:37:37 PM
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Saida Kaoua, Saida Krimi, Stanislav Péchev, Pierre Gravereau, Jean-Pierre Chaminade, et al.. Synthesis, crystal structure, and vibrational spectroscopic and UV-visible studies o fCs2MnP2O7. Journal of Solid State Chemistry, Elsevier, 2013, 198, pp.379-385. ⟨10.1016/j.jssc.2012.10.016⟩. ⟨hal-00758979⟩



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