Abstract
Reaction of aluminum chloride crystalline hydrate AlCl3(H2O)6 and urea in solid state and AlCl3(H2O)6–CO(NH2)2–H2O and AlCl3(CO(NH2)2)6–H2O aqueous solutions has been studied. Analysis of IR spectra of studied samples showed that complete substitution of water molecules in the first coordination sphere of Al3+ ion by urea molecules occurs at the molar ratio Al : CO(NH2)2 = 1 : 6 in solid and liquid phase. Computation of structures, IR spectra, and energy parameters for (CO(NH2)2)2, CO(NH2)2(H2O)2, CO(NH2)2(H2O)4, \({\text{Al}}\left( {{\text{CO}}{{{\left( {{\text{N}}{{{\text{H}}}_{2}}} \right)}}_{2}}} \right)_{6}^{{3 + }},\)\({\text{Al(CO(N}}{{{\text{H}}}_{2}}{{)}_{2}})_{{6\,\, + \,\,6}}^{{3 + }}\), and \({\text{Al(CO(N}}{{{\text{H}}}_{2}}{{)}_{2}}{{)}_{6}}({{{\text{H}}}_{2}}{\text{O}})_{3}^{{3 + }}\) complexes was performed using DFT (B3LYP-6-31++G(d,p)) method. On the basis of obtained data, competition between water and urea molecules in AlCl3(CO(NH2)2)6 aqueous solutions has been studied and experimental results have been explained.
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The first coordination sphere of Al3+ ion in dilute aqueous solutions of its salts consists of six water molecules, while completely filled second coordination sphere includes twelve water molecules (see, for example, the survey of experimental works [26] and the results of quantum chemical calculations [1, 27]).
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The IR spectra were recorded using equipment of the Shared Facility Center, Institute of General and Inorganic Chemistry, RAS, supported by the State Assignment of IGIC RAS in the area of basic research.
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Lyashchenko, A.K., Tarakanova, E.G., Frolova, E.A. et al. Environment of Al3+ Ion and Transsolvation Process in Water–Urea Solutions of Aluminum Chloride. Russ. J. Inorg. Chem. 64, 924–929 (2019). https://doi.org/10.1134/S0036023619070118
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DOI: https://doi.org/10.1134/S0036023619070118