FLUORINATED ALKOXIDES .15. SYNTHESIS AND HYDROGENATION OF IMINOALKOXY COMPLEXES OF COPPER(2+) - INFLUENCE OF CHELATE RING SIZE ON STRUCTURE AND MAGNETIC-PROPERTIES

Template condensation of 5, 5, 5-trifluoro-4-(trifluoromethyl)-4-hydroxy-2-pentanone, CH3COCH2C(CF3)2OH, with a variety of amino alcohols NH2(CH2)nOH (n = 2-6) in the presence of Cu2+ leads to stable, neutral, iminoalkoxy complexes with a 1:1 metal/ligand ratio for n = 2-4 and a 1:2 metal/ligand ratio for n = 5 or 6. These are Associated into tetranuclear units for n = 2, dinuclear units for n = 3 or 4, and mononuclear units for n = 5 or 6. Magnetic moments are reduced in the dinuclear but not the tetranuclear complexes; this is ascribed to a lack of planarity around the Cu atoms in the latter. Hydrogenation of the above (aminoalkoxy)copper(II) complexes is achieved with LiAlH4; dinuclear structures, all having reduced magnetic moments, are now found with n = 2-4, and mononuclear structures are found with n = 4-6. Possible structures consistent with observed magnetic and spectroscopic data are discussed. © 1979, American Chemical Society. All rights reserved.