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- W2004107618 abstract "The local environments of the cage molecules in the phases of P4Se3 are analysed with 31P MAS-NMR and Raman spectroscopy. The 31P MAS-NMR spectra of the orientationally ordered α and α′,-phases have different chemical shifts for the apical P atom (α: 68.0, 86 and 88.0 ppm; α′: 75.8 ppm), but similar chemical shifts for the basal P atoms (α: −58.8 ppm, α′: −60.0 ppm). When either α or α′-P4Se3 is heated above 358 K, the resulting β-P4Se3 has a well-resolved, liquid-like spectrum, indicating extensive molecular re-orientation. The slowly quenched β-phase shows a remnant β-phase mixed with the α-phase as well as P4Se4. A rapidly quenched sample of β-P4Se3 also shows a small remnant β-phase in the α-phase, but also a new phase with sharp resonances at 12.5, 3.6, 0.1 and −12 ppm. These are probably due to a P4Se4 phase which may be orientationally disordered. The Raman spectrum of P4Se3 heated above the α-β phase transition temperature shows a disappearance of the lattice modes and the 373 cm−1 mode as previously reported, but also shows some decomposition to P4Se4. The β-phase reverts into the α-phase on quenching, with only weak remnant bands attributable to P4Se4. The bands of P4Se4 become more prominent as the temperature of the β-phase is raised, but above the β-∂ phase transition they are less prominent. The Raman spectrum of P4Se4 is reported. The strongest band is at 350 cm−1, with the next strongest band at 185 cm−1. The spectra indicate that the dominant isomer is the selenium analogue of α-P4S4 (D2h), confirming previous 31P MAS-NMR studies." @default.
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- W2004107618 date "1991-01-01" @default.
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- W2004107618 title "Phases of tetraphosphorus triselenide analysed by magic angle spinning 31P NMR and Raman spectroscopy, and the Raman spectrum of tetraphosphorus tetraselenide" @default.
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- W2004107618 doi "https://doi.org/10.1016/0584-8539(91)80153-a" @default.
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