Hexaaquaaluminium(III) tris(methanesulfonate)

Abstract

The title compound, [Al(H2O)6](CH3SO3)3 (common name: aluminium methane­sulfonate hexa­hydrate), was crystallized from an aqueous solution prepared by the precipitation reaction of aluminium sulfate and barium methane­sulfonate. Its crystal structure is the first of the boron group methane­sulfonates to be determined. The characteristic building block is a centrosymmetric unit containing two hexa­aqua­aluminium cations that are connected to each other by two O atoms of the –SO3 groups in an O—H⋯O⋯H—O sequence. Further O—H⋯O hydrogen bonding links these blocks in orthogonal directions – along [010] forming a double chain array, along [10-1] forming a layered arrangement of parallel chains and along [101] forming a three-dimensional network. As indicated by the O⋯O distances of 2.600 (3)–2.715 (3) Å, the hydrogen bonds are from medium–strong to strong. A further structural feature is the arrangement of two and four methyl groups, respectively, establishing ‘hydro­phobic islands’ of different size, all positioned in a layer-like region perpendicular to [101]. The only other building block within this region is one of the –SO3 groups giving a local connection between the hydro­philic structural regions on both sides of the ‘hydro­phobic’ one. Thermal analysis indicates that a stepwise dehydration process starts at about 413 K and proceeds via the respective penta- and dihydrate until the compound completely decomposes at about 688 K.

In situ Crystallization of Methanesulfonic Acid, CH3SO3H, and Serendipitous Single Crystal Formation of its Anhydride, (CH3)2S2O5

“…Within the molecules, the S−O bonds are found at 144.14(7) pm (S1−O11) and 142.57(8) pm (S1−O13) while the S−OH bond is significantly larger with a value of S1−O12 154.28(7) pm). The C−S bond length is found at 173.8(1) pm what is in line with typical findings in methanesulfonates [2–21] . The respective value in the fluorinated derivative CF 3 CSO 3 H is about 10 pm longer [22] .…”

“…The CÀ S bond length is found at 173.8 (1) pm what is in line with typical findings in methanesulfonates. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] The respective value in the fluorinated derivative CF 3 CSO 3 H is about 10 pm longer. [22] The bond angles ff OÀ SÀ O show a broad range between 117.41(5)°and 104.98(5)°.…”

“…Moreover, the acid is regarded as environmentally benign as it is biodegradable. [1] Meanwhile, a large number of different salts has been described, [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] and also we could contribute to this class of compounds, with special emphasis on solvent-free methanesulfonates. [17][18][19][20][21] Despite of these reports on methanesulfonates and the frequent use of the acid, it is interesting to see that the structure of CH 3 SO 3 H in the solid state is still unknown.…”

Obtaining, studying the properties, and application of zirconium(IV) oxymethanesulfonate

“…Articles [9,10] addressed the obtaining of hexaaca aluminum methane sulfonate. Its structure was studied, as well as the chemical properties.…”