One-dimensional Structure Consisting of Pin-wheel Cu4Gd Core and Na+ as Connector

A 3d–4f complex with the formula of {Na[(CuL)4Gd]}1∞ was prepared, where (CuL)− is a “ligand-complex,” [N-(4-methyl-6-oxo-3-azahept-4-enyl)oxamato]copper(II). The structure consists of a pin-wheel-like Cu4Gd core and Na+ ion as a connector to give a one-dimensional chain. The magnetic data and their analyses demonstrated an intramolecular ferromagnetic interaction within a Cu4Gd core and an intercore antiferromagnetic interaction operating through Na+ ion with the coupling parameters of J=+1.09 cm−1, zJ′=−0.07 cm−1; SCu=1⁄2, SGd=7⁄2).