Crystal data for the decavanadates of methylpyridines

Indexed powder patterns of three monoclinic compounds of general formula (BH)₃H₃V₁₀O₂₈ . xH₂O, (C₆H₈N)₃H₃V₁₀O₂₈.xH₂O, where 0.5 ≤ x ≤ 2 and B = 2-methylpyridine (J2), 3-methylpyridine (J3) and 4-methylpyridine (J4), are given. The lattice parameters of the unit cells with two molecules are: J2a = 10.263 (8), b = 14.253 (7), c = 16.229 (8) Å, β = 104.36 (5)°; J3a = 13.108 (3), b = 20.633 (5), c = 8.363 (1) Å, β = 104.31 (2)°; J4a = 11.003 (3), b = 22.869 (6), c = 9.569 (3) Å, β = 98.03 (2)°.