Ti3C3@C2v(9)-C82: a double-butterfly tri-metal carbide cluster inside a fullerene cage

An unprecedented double-butterfly Ti 3 C 3 cluster with a rare Ti–C coordination mode was stabilized inside a C 82 cage, forming a novel tri-metal carbide clusterfullerene, Ti 3 C 3 @ C 2 v (9)-C 82 .