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A novel polyoxometalate-based organic–inorganic hybrid compound, (C 4 H 7 N 2 ) 2 (H 3 O) 2 [β-Mo 8 O 26 ]·2H 2 O (1), has been synthesized and structurally characterized by single-crystal X-ray diffraction methods, IR spectroscopy, UV–Vis absorption. Compound (1) crystallizes in the Triclinic system, space group P -1 with unit a = 8.379 (3) A, b = 10.200 (5) A, c = 10.861 (5) A, α = 68.27° (3), β = 71.61° (2), γ = 78.40° (3), V = 814.5 (6) A 3 , Z = 2. The refinement of the structure leads to a residual factor R = 0,050 for 3549 independent observed reflections [I > 2σ(I)] and 227 parameters. The structure of (1) consists of [β-Mo 8 O 26 ] 4- anions with [C 4 H 7 N 2 ] + , H 3 O + cations and water molecules connected to the mineral parts by hydrogen bonds. Furthermore, we report results of the thermogravimetric analysis, cyclic voltammetry measurement and Hirshfeld surface studies.

A new molybdomanganate based on the Waugh-type polyoxoanion K1,5(NH4)4,5[MnMo9O32]·4.2H2O (1) has been synthesized in aqueous solution and characterized by single crystal X-ray diffraction, IR spectroscopy, thermogravimetric analysis and cyclic voltammetry measurements. The title compound was crystallized in the trigonal system, space group R3 with a = 15.950 (3) A, b = 15.950 (3) A, c = 12.447 (2) A, γ = 120°, V = 2742.3 (9) A3, Z = 3, R1 = 0.031 and wR2 = 0.088. Left-handed and right-handed [MnMo9O32]6− polyanions enantiomers can be observed in compound (1). The homochiral enantiomers are consolidated by many hydrogen bonds involving ammonium cations and water molecules which are stacked into a 3D framework.