5 years ago

Synthesis of an Aluminum Hydroxide Octamer through a Simple Dissolution Method

Synthesis of an Aluminum Hydroxide Octamer through a Simple Dissolution Method
Brantly L. Fulton, Christopher A. Colla, Darren W. Johnson, Eric S. Eitrheim, Tori Z. Forbes, Lauren B. Fullmer, Deok-Hie Park, William H. Casey, James E. Hutchison, May Nyman, Anna F. Oliveri, Cory K. Perkins, Douglas A. Keszler
Multimeric oxo-hydroxo Al clusters function as models for common mineral structures and reactions. Cluster research, however, is often slowed by a lack of methods to prepare clusters in pure form and in large amounts. Herein, we report a facile synthesis of the little known cluster Al8(OH)14(H2O)18(SO4)5 (Al8) through a simple dissolution method. We confirm its structure by single-crystal X-ray diffraction and show by 27Al NMR spectroscopy, electrospray-ionization mass spectrometry, and small- and wide-angle X-ray scattering that it also exists in solution. We speculate that Al8 may form in natural water systems through the dissolution of aluminum-containing minerals in acidic sulfate solutions, such as those that could result from acid rain or mine drainage. Additionally, the dissolution method produces a discrete Al cluster on a scale suitable for studies and applications in materials science. Super 8: The octameric aluminum hydroxide cluster [Al8(OH)14(H2O)18]10+ is readily synthesized and isolated through the dissolution of aluminum hydroxide in sulfuric acid and subsequent crystal growth. Structural studies reveal the existence of the cluster in solution. Al red, O green, H blue (Image by Dr. Anna Oliveri).

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201702318

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