A one-dimensional copper(II) coordination polymer constructed by pyridyl-2,5-dicarboxylate: Helical structure and magnetic property

摘要

Hydrothermal synthesis of pyridyl-2,5-dicarboxylate (H_2L) and Cu(II) salt in the mixed solvents of water and pyridine (py) afforded one unusual 1D coordination polymer, [Cu_4(L)_4(py) _4], with neighboring left- and right-handed helical chains. Strong π-π packing and Cu?O interactions found among neighboring chains lessen the inter-chain Cu?Cu distances to about 3.83. Magnetic measurements show a ferromagnetic exchange with the 2J value of 27.7 cm ~(-1).