Abstract
Borophosphates of transition 3d metals are based on the mixed heteropolyhedral MTT- or MTTTr-type frameworks formed by MØ6 octahedra, two types of TØ tetrahedra (PO4 and BO4 tetrahedra), and, more rarely, TrO3 triangles (BO3 triangles). Family of compounds with the general formula A1−x+Bx2+ {Mx2+M1−x3+ [BP2O8(OH)]} (where A+ = K, Rb, Cs, NH4, B2+ = Ba, Pb, M2+ = Fe, Co, Zn, and M3+ = Al, Ga, V3+, Fe3+, Sc, In; x = 0, 1) includes monoclinic (space group P21/c) and triclinic (space group P1¯) borophosphates. Single crystals of Rb{V[BP2O8(OH)]} were synthesized by a hydrothermal method. The crystal structure was studied by single-crystal X-ray diffraction analysis: space group P21/c (No. 15), a = 9.3699(8), b = 8.3162(7), c = 9.6707(8) Å, β = 102.073(9); V = 736.89(11) Å3. The crystal structure of Rb{V[BP2O8(OH)]} was refined to the final R = 4.52%. A topological description of both structure types of the A1−x+Bx2+ {Mx2+M1−x3+ [BP2O8(OH)]} compounds and related vanadium-containing phases is given. Because these compounds are characterized by the microporous crystal structures, the possible migration paths for different alkaline ions have been calculated.
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