Trimeric hexa-dimethyltin-functionalized selenotungstate [{Sn(CH3)2(CH3COO)}3{Sn(CH3)2}3{Se2W18O62(OH)(H2O)}3]18−

The trimeric organic–inorganic hybrid selenotungstate(IV) [{Sn(CH3)2(CH3COO)}3{Sn(CH3)2}3{Se2W18O62(OH)(H2O)}3]18− is composed of three Wells–Dawson-type {α-Se2W18} fragments and six {(CH3)2Sn2+} groups involving the first reported carboxyl-modified dimethyltin moieties, exhibiting photocatalytic H2 evolution activity.