Complementary Multicomplexation of Desymmetrized 2,2-Bipyridine Ligands on Square Planar Pd(II) Centers

Upon complexation with Pd(II) ion, desymmetrized chelating ligand, 6-methyl-2,2ʹ-bipyridine (1), gives only anti Pd·(1)22+ complex. This regioselective complexation is applied to complementary multicomplexation of liner molecular strands: namely, a strand containing two methyl-substituted 2,2ʹ-bipyridine units is selectively complexed on Pd(II) with its counterpart strand in which methyl groups are complementarily substituted.