Hierarchical Helix of Helix in the Crystal: Formation of Variable-Pitch Helical π-Stacked Array of Single-Helical Dinuclear Metal Complexes

摘要

Unique helix of helix structures were formednvia intermolecular π-stacking and metal−metal interactionsnin the crystal of single-helical dinuclear complexes [L2M2]n(M = Pd, Ni) having an acyclic bis(N2O2)-type ligand. Thendifference in the helical winding angle of the constituentsn(401.7° for [L2Pd2]; 421.3° for [L2Ni2]) led to variation ofnthe helical pitches of the helical array (72 helix for [L2Pd2];n62 helix for [L2Ni2]).