<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The rhenium carbonyl cluster (Me<sub>4</sub>N)<sub>13</sub> [H<sub>11</sub>(AsW<sub>11</sub>O<sub>39</sub>)<sub>4</sub>{(Re (CO)<sub>3</sub>)<sub>3</sub>(μ<sub>3</sub>‐OH) (μ<sub>2</sub>‐OH)}<sub>4</sub>]·23H<sub>2</sub>O is synthesized by reaction of Re(CO)<sub>5</sub>Cl and [Me<sub>4</sub>N]<sub>8</sub>[HAsW<sub>9</sub>O<sub>4</sub>] in a mixture of MeCN and H<sub>2</sub>O (80 °C, 1 h, 15% yield).</p> </abstract>