Dinuclear copper(II) complex with the general formula [(diamine)Cu(OH)]2(ClO4)2, where diamine stands for N,N'-dialkyl,N-benzyl-ethylenediamine, were prepared. The complexes were characterized by elemental analysis, spectroscopic, conductance measurements, and X-ray structural analysis. The complexes are soluble in various organic solvents and show positive solvatochromism. Thermochromism was also observed particularly in strong donor solvents.