Abstract
Abstract1‐(4‐pyridyl)pyridinium ion (C10H10N22+, (Py2)H2+) precipitates from the hydrochloric acid solution of (NH4)2MoCl5 · H2O sparingly soluble (Py2)HMoCl5 · H2O. This unreactive, air stable compound crystallizes in the orthorhombic unit cell with a = 12.895(4), b = 6.914(2), c = 16.388(7) Å, Z = 4. The ionic structure contains octahedral MoCl5 · H2O2– and (Py2)H2+. The bond lengths MoCl are between 2.406(3) to 2.446(4) Å. The bond length MoO(H2O) is 2.19(1) Å. Planar pyridine rings of the cation are rotated around the common axis by 38°. Anions are located in layers at Z = 1/4 and 3/4. Between the layers (Py2)H2+ cations are situated.(Py2)MX4Py2 (M = Mo, W; X = Cl, Br; Py = Pyridine) with deprotonated (Py2)H2+ are prepared from the solutions of (PyH)MoX4Py2 in aqueous ammonia to which (Py2)HCl2 was added. All four compounds crystallize in the triclinic crystal system. Unit cell dimensions are comparable. The stability of the compounds against oxidation and substitution could have its origin in the low solubility.
Published Version
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