A facile synthesis of 2-formyl-1, 8-naphthalenediol is reported. Its potential as a general precursor for the preparation of unsymmetrical multidentate chelating ligand systems based on 1, 8-naphthalenediol is demonstrated by the synthesis of the dinucleating ligand L4−(H4L= N, N′-bis (2-(1, 8-naphthalenediol) methylidene) propylenediamine). Reaction of H4L with copper acetate results in the formation of the unsymmetrical dinuclear CuII ...