Fig. 1. (a) Molecular structures of the [VL3]2– and [CuL2]2– units as determined in the crystal structures of 1 and 2. Dark green, red, yellow, gray, and white spheres represent vanadium, copper, sulfur, carbon, and hydrogen atoms, respectively. (b) Qualitative d-orbital splitting diagrams for 1 (top), and 2 (bottom) highlight the nature of the orbital singly occupied by an unpaired spin.
