Synthesis of an Aluminum Hydroxide Octamer through a Simple Dissolution Method

Abstract

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 Al (OH) (H O) (SO ) (Al ) through a simple dissolution method. We confirm its structure by single-crystal X-ray diffraction and show by Al NMR spectroscopy, electrospray-ionization mass spectrometry, and small- and wide-angle X-ray scattering that it also exists in solution. We speculate that Al 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.

Designable Aluminum Molecular Rings: Ring Expansion and Ligand Functionalization

“…To create crystalline Al III -based materials,the controllable hydrolysis of Al III sources into measurable crystals is ab ig challenge.C ompared to the 150-year-old chemistry of hydrolysis of inorganic Al III salts, [7][8][9][10][11][12] the hydrolysis of organoaluminium compounds is relatively new. [13][14][15][16][17][18][19] More importantly,o rganoaluminium with highly tailorable shape,c omposition, and surface properties represents an excellent platform for significant atomistic understanding.H owever, the fast hydrolysis of aluminum salts/alkoxides usually results in the formation of ametal oxide/hydroxide.Inthis regard, it is important to slow down its hydrolysis process to promote crystallization and simultaneously enable condensation occurs.R ecently,w eh ave applied organic ligands to delay the hydrolysis process of Ti IV ions through coordination interactions (denoted as coordination delayed hydrolysis (CDH)).…”

Designable Al32‐Oxo Clusters with Hydrotalcite‐like Structures: Snapshots of Boundary Hydrolysis and Optical Limiting

“…Apart from the single X-ray diffraction data, another direct evidence for the local environment (Al-O coordination) of the Al 3+ cations is the solid-state 27 Al NMR. [19] As shown in Figure 1c,t he 27 Al SP-MAS NMR spectrum revealed the presence of three different kinds of Al 3+ cations. Thes harp signal around zero ppm (W 1/2 = 8061 Hz) was characteristic of six-coordinate aluminum.…”

The Role of Bi3+ in Promoting and Stabilizing Iron Oxo Clusters in Strong Acid

“…As stated above,t he Fe 3 O trimer structurally resembles the most distinctive building block of the Keggin ion. Fe 3 O [Fe 3 O(CCl 3 COO) 6 (THF) 3 ]Cl (see the Supporting Information for details of the synthesis) was dissolved in ap H0.05 buffer solution with astoichiometric amount of bismuth (2:1 Fe/Bi), and the reaction mixture was heated to reflux for 24 hours.Instead of forming alarger cluster, Fe 3 O fragmented into smaller ions,w hich were undetectable by SAXS (Figure S11). This result shows that the FeÀOÀBi preconnectivity is important for the derivation of larger polynuclear forms.…”