Synthesis and crystal structures of dimeric W(Mo)/Cu/S and polymeric W/Cu/S neutral clusters with flexible 1,4-bis(3,5-dimethylpyrazol-1-yl)butane as a linker ligand

► A flexible bridging ligand can adopt various conformations. ► This provides means of linking metal clusters in different ways. ► The result may be a discrete dimer or a chain polymer. ► Examples of both types of complex have been structurally characterized. ► The new complexes are also investigated by spectroscopic methods.