Abstract The newly synthesized complex (2) of copper (I) chloride with di-n-hexyl 2, 2′- biquinoline-4, 4′-dicarboxylate (L) was spectroscopically and electrochemically characterized. The X-ray diffraction study showed that the crystals of complex 2 consist of the dinuclear moieties [L 2 Cu 1 2 (μ-Cl) 2] containing Cu 2 (μ-Cl) 2 clusters. Spectrophotometric studies and ESI-mass spec-trometric measurements showed that after the dissolution of ...