Abstract
Two novel aluminium double salts, [Al(H2O)6](SO4)NO3·2H2O, hexa-qua-alumin-ium sulfate nitrate dihydrate, (1), and [Al(H2O)6](SO4)Cl·H2O, hexaqua-aluminium sulfate chloride hydrate, (2), were obtained in the form of single crystals. Their crystal structures are each based on an octa-hedral [Al(H2O)6]3+ unit and both structures have in common one charge-balancing SO4 2- anion. The final positive charge from the aluminium(III) cation is balanced by an NO3 - or a Cl- anion for (1) and (2), respectively. Compound (1) further contains two unligated water mol-ecules while compound (2) only contains one unligated water mol-ecule. In the crystal structures, all components are spatially separated and inter-actions are mediated via medium-strong hydrogen bonding, compared to many other reported aluminium sulfates where corner-sharing of the building units is common. The two compounds represent rare cases where one aluminium(III) cation is charge-balanced by two different anions.
Highlights
Two novel aluminium double salts, [Al(H2O)6](SO4)NO3Á2H2O, hexaquaaluminium sulfate nitrate dihydrate, (1), and [Al(H2O)6](SO4)ClÁH2O, hexaquaaluminium sulfate chloride hydrate, (2), were obtained in the form of single crystals
The final positive charge from the aluminium(III) cation is balanced by an NO3À or a ClÀ anion for (1) and (2), respectively
All components are spatially separated and interactions are mediated via medium–strong hydrogen bonding, compared to many other reported aluminium sulfates where corner-sharing of the building units is common
Summary
Aluminium is one of the most common elements in Earth’s crust and is predominantly found in oxides and silicates. The far most common oxidation state for inorganic compounds is +III. Aluminium is found in many double salts with numerous other cations and sulfate, such as the industrially important alums MAl(SO4)2Á12H2O (M = monovalent cation; Greenwood & Earnshaw, 1997). At low pH, aluminium mainly exists in solution as the [Al(H2O)6]3+ cation (Hay & Myneni, 2008). One of the title compounds, [Al(H2O)6](SO4)NO3Á2H2O, (1), was obtained as an unintentional side product when attempting to synthesize an aluminium-modified bismuthtitanium oxo-complex. Efforts to obtain (1) by other routes resulted in the formation of [Al(H2O)6]SO4ClÁH2O (2)
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