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Using density functional theory calculations, we investigated the structure and electronic properties of cyclooctatetraene (C 8 H 8 , COT)-ligand mono- or bi-transition-metal (M) sandwich clusters, M  n  (COT)  n +1 (M = Sc, Ti, Cr, Mn, n = 1, 2) or (COT)M 1 (COT)M 2 (COT), as well as their one-dimensional infinite molecular wires. All the sandwich M-COT clusters and molecular wires are rather stable with their binding energies ranging from 3.20 to 7.48 eV per transition-metal atom. Superior to M  n  Bz  n +1 complexes, most sandwich M-COT complexes are in their high spin states with ultrahigh magnetic moments. Moreover, one-dimensional infinite molecular wires, [Cr(COT)] ∞ , [(COT)V(COT)Ti] ∞ and [(COT)Sc(COT)Cr] ∞ , are predicted to be ferromagnetic half-metals. Our findings suggest that such M-COT sandwich complexes may be potential candidates for applications in spintronics.

Theoretical Study on Sandwich-Like Transition-Metal–Cyclooctatetraene Clusters and One-Dimensional Infinite Molecular Wires