New μ-hydroxido-bridged copper nitrate dimer and μ4-oxido-bridged copper phenylacetate quasi-tetrahedron: Direct synthesis and uphill conversion
摘要:
Dinuclear [Cu-2(mu-OH)] fragment and its self-assembled tetranuclear part [Cu-2(mu(4)-O)Cu-2] are found in two copper(II) complexes of ligand H3bpmp: [Cu-2(mu(2)-OH)(mu-H(2)bpmp)(mu(1.3)-NO3)][Cu-2(mu(2)-OH)(mu-H(2)bpmp)(NO3)(H2O)](NO3)2 center dot 2H(2)O (1 center dot 2H(2)O) and [Cu-4(mu(2)-OH)(mu-H(2)bpmp)(2)(mu(1.3)-O2CCH2Ph)(4)] (2) [H(3)bpmp = 2,6-bis-[(3-hydroxy-propylimino)-methyl]-4-methylphenoll. These complexes have been synthesized and characterized by single crystal X-ray crystallography. Complex 1 showed unique reactivity with phenylacetate anions to provide 2 in which two [Cu-2(mu(2)-OH)] units available within same crystal lattice collapsed to give [Cu-4(mu(4)-O)] hub. Formation of the [Cu-4] compound is also achieved from individual components and phenylacetate ligands, which allows an effective tuning of the self-assembly of two ligand bound [Cu-2] fragments and removal of H+ from hydroxido bridges to provide oxido nucleus. (C) 2012 Elsevier Ltd. All rights reserved.