Abstract
The synthesis, X-ray crystal structures, and ESR and magnetic properties of the anhydrous salt Na3[Cr(OH)6Mo6O18]·6(CH3)2SO (CrDMSO) containing the Anderson−Evans polyanion, of two new molecular compounds based on this polyanion ([Fe(C5Me5)2]3[Cr(OH)6Mo6O18]·20H2O [FeCr(1)], Na[Fe(C5H5)2]2[Cr(OH)6Mo6O18]·3H2O [FeCr(2)]), and of another based on a Keggin polyanion, [Fe(C5Me5)2]4[HPCu(H2O)W11O39]·6CH3CN (FeCu), are reported. CrDMSO: monoclinic, C2/c, a = 25.37(2) A, b = 14.632(2) A, c = 15.455(6) A, β = 123.17(4)°, Z = 4. FeCr(1): triclinic, P1, a = 12.489(3) A, b = 14.113(3) A, c = 15.662(4) A, α = 101.55(2)°, β = 105.82(2)°, γ = 110.23(2)°, Z = 1. FeCr(2): monoclinic, P21/n, a = 10.015(2) A, b = 7.722(6) A, c = 25.137(5) A, β = 90.626(9)°, Z = 2. FeCu: monoclinic, P21/n, a = 15.596(7) A, b = 15.138(3) A, c = 25.921(12) A, β = 97.53(2)°, Z = 2. In the compound FeCr(1) the Fe(C5Me5)2 units are perpendicular to each other and form a centrosymmetrical group of three cations, which alternates with the pla...
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