Lamellar nanoribbons consisting of 1:2 complexes of divalent copper and N-(2-hydroxydodecyl)-L-alanine (L-AlaC(12)OH) and related N-(2-hydroxydodecyl)-substituted amino acid were newly developed. When racemic ligand was used, the lamellar size showed shrinkage and the stability of the fibrous nanostructures were enhanced, reflecting the spontaneous effective mixing of L and D complexes to form supramolecular racemic compounds.