Do J, Bontchev R P, Jacobson A J
Department of Chemistry, University of Houston, Houston, Texas 77204-5641, USA.
Inorg Chem. 2000 Jul 24;39(15):3230-7. doi: 10.1021/ic0000303.
The 1/2V2O5-H2C2O4/H3PO4/NH4OH system was investigated using hydrothermal techniques. Four new phases, (NH4)VOPO(4).1.5H2O (1), (NH4)0.5VOPO(4).1.5H2O (2), (NH4)2[VO(H2O)3]2[VO(H2O)][VO(PO4)2]2.3H2O (3), and (NH4)2[VO(HPO4)]2(C2O4).H2O (4), have been prepared and structurally characterized. Compounds 1 and 2 have layered structures closely related to VOPO(4).2H2O and A0.5VOPO4.yH2O (A = mono- or divalent metals), whereas 3 has a 3D open-framework structure. Compound 4 has a layered structure and contains both oxalate and phosphate anions coordinated to vanadium cations. Crystal data: (NH4)VOPO(4).1.5H2O, tetragonal (I), space group I4/mmm (No. 139), a = 6.3160(5) A, c = 13.540(2) A, Z = 4; (NH4)0.5VOPO(4).1.5H2O, monoclinic, space group P2(1)/m (No. 11), a = 6.9669(6) A, b = 17.663(2) A, c = 8.9304(8) A, beta = 105.347(1) degrees, Z = 8; (NH4)2[VO(H2O)3]2[VO(H2O)][VO(PO4)2]2.3H2O, triclinic, space group P1 (No. 2), a = 10.2523(9) A, b = 12.263(1) A, c = 12.362(1) A, alpha = 69.041(2) degrees, beta = 65.653(2) degrees, gamma = 87.789(2) degrees, Z = 2; (NH4)2[VO(HPO4)]2(C2O4).5H2O, monoclinic (C), space group C2/m (No. 12), a = 17.735(2) A, b = 6.4180(6) A, c = 22.839(2) A, beta = 102.017(2) degrees, Z = 6.
采用水热技术对1/2V2O5-H2C2O4/H3PO4/NH4OH体系进行了研究。制备并对四个新相(NH4)VOPO(4).1.5H2O (1)、(NH4)0.5VOPO(4).1.5H2O (2)、(NH4)2[VO(H2O)3]2[VO(H2O)][VO(PO4)2]2.3H2O (3)和(NH4)2[VO(HPO4)]2(C2O4).H2O (4)进行了结构表征。化合物1和2具有与VOPO(4).2H2O和A0.5VOPO4.yH2O(A = 一价或二价金属)密切相关的层状结构,而化合物3具有三维开放骨架结构。化合物4具有层状结构,并且含有与钒阳离子配位的草酸根和磷酸根阴离子。晶体数据:(NH4)VOPO(4).1.5H2O,四方晶系(I),空间群I4/mmm(编号139),a = 6.3160(5) Å,c = 13.540(2) Å,Z = 4;(NH4)0.5VOPO(4).1.5H2O,单斜晶系,空间群P2(1)/m(编号11),a = 6.9669(6) Å,b = 17.663(2) Å,c = 8.9304(8) Å,β = 105.347(1)°,Z = 8;(NH4)2[VO(H2O)3]2[VO(H2O)][VO(PO4)2]2.3H2O,三斜晶系,空间群P1(编号2),a = 10.2523(9) Å,b = 12.263(1) Å,c = 12.362(1) Å,α = 69.041(2)°,β = 65.653(2)°,γ = 87.789(2)°,Z = 2;(NH4)2[VO(HPO4)]2(C2O4).5H2O,单斜晶系(C),空间群C2/m(编号12),a = 17.735(2) Å,b = 6.4180(6) Å,c = 22.839(2) Å,β = 102.017(2)°,Z = 6。