摘要
The title compound was prepared by solid state reaction of LaCl_3/V inan evacuated silica tube where the silicon came from the reaction tube. The compoundcrystallizes in monoclinic space group C2/m with cell dimensions of a=13. 482 (7), b=5. 604(3), c=11. 091(3) A, β=100. 44(3)°, V=824(1) A3, Mr= 1274. 66 , Dc=5. 14 g/cm3, F(000) = 1150, μ- 13. 20 mm-1 and Z=2; final R=0. 061, Rw=0. 054for 1037 observed reflections (Ⅰ>3σ(Ⅰ) ) . It is isostructural with quasi-ZD Pr_4V_5Si_4O_(22)compound with the Ⅴ-Ⅴ distances across the shared VO6 octahedral edges of 2. 802 Aand vanadium ions show mixed-valence(Ⅲ/Ⅳ) with an average value of+ 3. 2.
The title compound was prepared by solid state reaction of LaCl_3/V inan evacuated silica tube where the silicon came from the reaction tube. The compoundcrystallizes in monoclinic space group C2/m with cell dimensions of a=13. 482 (7), b=5. 604(3), c=11. 091(3) A, β=100. 44(3)°, V=824(1) A3, Mr= 1274. 66 , Dc=5. 14 g/cm3, F(000) = 1150, μ- 13. 20 mm-1 and Z=2; final R=0. 061, Rw=0. 054for 1037 observed reflections (Ⅰ>3σ(Ⅰ) ) . It is isostructural with quasi-ZD Pr_4V_5Si_4O_(22)compound with the Ⅴ-Ⅴ distances across the shared VO6 octahedral edges of 2. 802 Aand vanadium ions show mixed-valence(Ⅲ/Ⅳ) with an average value of+ 3. 2.
