Abstract
Two new nitronyl nitroxide Cu(II) complexes {[Cu(hfac)2]2(NIT-4PyPh)}2(1) and [Cu(hfac)2][(NIT-3PyPh)2](2)(NIT-4PyPh=2-[4-(4-pyridinylmethoxy) phenyl]-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide,NIT-3PyPh=2-[4-(3-pyridinylmethoxy)phenyl]-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide,hfac=hexafluoroacetylacetone), have been synthesized and characterized. The X-ray crystal structure analyses show that structures of the two complexes are different. Complex 1 crystallizes in cyclic metal-radical dimer consisting of four Cu(hfac)2 and two NIT-4PyPh ligands; four Cu(II) atoms adopt two coordinated modes. In the ring, each Cu(II) ion is hexa-coordinated by four oxygen atoms of two hfac ligands and one oxygen atom (ONCNO) and one nitrogen atom of the pyridinyl group from two different radicals. Outside the ring, each Cu(II) is penta-coordinated by four oxygen atoms of two hfac ligands and one oxygen atom (ONCNO) from the radical ligand. Complex 2 crystallizes in discrete molecule, while the Cu(II) atom is hexa-coordinated by four oxygen atoms of two hfac molecules and two nitrogen atoms of the pyridinyl group from two radical ligands.
Highlights
The combination of metal ions and nitronyl nitroxides has proved to be efficient for making molecular magnetic materials [1] [2]
Each Cu(II) ion is hexa-coordinated by four oxygen atoms of two hfac ligands and one oxygen atom (ONCNO) and one nitrogen atom of the pyridinyl group from two different radicals
Complex 2 crystallizes in discrete molecule, while the Cu(II) atom is hexa-coordinated by four oxygen atoms of two hfac molecules and two nitrogen atoms of the pyridinyl group from two radical ligands
Summary
The combination of metal ions and nitronyl nitroxides has proved to be efficient for making molecular magnetic materials [1] [2]. Because they bear one or more unpaired electrons in their π-system arising from the overlap between 2p atomic orbitals, stable radicals have rapidly recognized as interesting building blocks for molecule-based magnetic materials. Copper(II) complexes are ease to show various kinds of topological structures and are as an unique objects (s = 1/2) for studying the peculiarities of magnetic exchange pathways between different types of paramagnetic centers, so the syntheses of copper (II)-NITR complexes draw more attentions [4] [9] [10]. Two new nitronyl nitroxide Cu(II) complexes {[Cu(hfac)2]2(NIT-4PyPh)}2(1) and [Cu(hfac)2(NIT-3PyPh)2](2) (hfac=hexafluoroacetylacetone) were synthesized and characterized
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