Magnetic Properties of Carboxylate-Bridged Ferromagnetic Copper(II) Chains Coupled by Cation−π Interactions

摘要: The exchange interactions between copper ions in (l-tryptophyl-glycinato)copper(II), C13H13CuN3O3 (named Cu(II)Trp-Gly) are determined by ac magnetic susceptibility and dc magnetization measurements powder samples, EPR single-crystal samples. this compound arranged two symmetry-related types of chains along the b axis. Neighbor coppers a chain at 5.14 A connected equatorial syn−anti carboxylate bridges, which transmit intrachain interactions. Indole rings neighbor tryptophan residues apical positions provide cation−π contacts that give rise to pathways supporting chains. data obtained temperature range 1.8 < T 100 K, with applied fields (B) up 9 explained assuming one-dimensional spin ferromagnetic coupling 2J/k = 3.9 ± 0.1 calculated from zero-field susceptibility. magnetiz...