A new heterospin complex from oxamide-bridged Cu(II) binuclear units and carboxy-phenyl-substituted nitronyl nitroxide

A new heterospin complex 1, [Cu2(oxpn)(NITPBA)2], derived from trans-oxamido-bridged copper(II) binuclear units [Cu2(oxpn), oxpn = N,N′-bis(2-aminopropyl)oxamide] and carboxyl-substituted nitronyl nitroxide, (NITPBAH = 2-(4-carboxy-phenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxyl-3-oxide), has been synthesized and characterized structurally and magnetically. The complex 1 is a four-spin system. The magnetic susceptibility of 1 was measured over the range 2–300 K, which shows that there are unusually moderate antiferromagnetic-interactions between two copper(II) ions bridged by the oxamato bridge.