Zusammenfassung
Cs2Ga2Se5 was obtained by the reaction of CsN3 with stoichiometric amounts of GaSe and Se at elevated temperature. It forms yellow crystals embedded in a pure orange microcrystalline powder. The crystal structure of Cs2Ga2Se5 was determined by single-crystal X-ray diffraction at 123 K. The compound crystallizes monoclinically in the space group C2/c (No. 15) with a = 15.3911(5) angstrom, b = ...
Zusammenfassung
Cs2Ga2Se5 was obtained by the reaction of CsN3 with stoichiometric amounts of GaSe and Se at elevated temperature. It forms yellow crystals embedded in a pure orange microcrystalline powder. The crystal structure of Cs2Ga2Se5 was determined by single-crystal X-ray diffraction at 123 K. The compound crystallizes monoclinically in the space group C2/c (No. 15) with a = 15.3911(5) angstrom, b = 7.3577(2) angstrom, c = 12.9219(3) angstrom, = 126.395(3)degrees, V = 1177.89(7) angstrom(3), and Z = 4. The structure features one-dimensional chains (1)[Ga2Se3(Se-2)(2-)], consisting of edge- and corner sharing GaSe4 tetrahedra. Raman spectroscopic measurements reveal vibrational bands of the Se-2(2-) units at 236 cm(-1), and the bands of Ga-Se vibrations at 254 and 273 cm(-1). UV/Vis diffuse reflectance spectroscopy shows the bandgap at about 1.95 eV.
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