The crystal structure of complex 2 is to 3.306 Å, suggesting that they are strongly influenced by the characteristics of the ligand and the nuclearity of the complex. It is observed that the Cu–Cu distance in complex 2, (Table 3) together with the Cu–S–Cu bridging moieties are longer than those bridged by the copper ion. The Cu Cu distances in the hexanuclear units of the [Cu6(eptu)6] octahedron (2) are in the 3.596–3.629 Å range, whereas the Cu Cu distances in the triangular [l-S–Cu3–Cu1] and [l-S–Cu3–Cu2] units are in the 3.133–3.255 Å range for the triangle formed by Cu1Cu3Cu2. The structure of complex2 is stabilized by C–H S hydrogen bonding, leading to the formation of a paddle-wheel like structure (Fig. 5).