Giant Heterometallic Cu17Mn28 Cluster with Td Symmetry and High-Spin Ground State

Reaction of copper powder with Mn(OAc) 2 ·4H 2 O and triethanolamine in DMF solution in air yields a high nuclearity, mixed-valent Cu I 4 Cu II 13 Mn II 4 Mn III 12 Mn IV 12 cluster. X-ray crystallography shows that 1 contains an unprecedented adamantane-like Mn 28 core connected wholly by Mn 4 O 4 cubane units. Magnetic susceptibility data indicate a S = 51 / 2 ground state in low magnetic field with a S = 63 / 2 excited state only 5 K in energy above the ground state.