Structure and magnetic properties of a hydroxo-bridged copper(II) distorted cubane stabilized via supramolecular hydrogen bonding with an ionic hexafluoroacetylacetonate.
Tetranuclear [Cu(II)4(OH)4(aib)4)](hfac)4 (1; aib = 2-methyl-2-amino-4-iminopentane; hfac = hexafluoroacetylacetonate) forms from the reaction of aqueous ammonia and Cu(hfac)2.2H2O in acetone. The structure of 1 reveals that four noncoordinating hfac- counterions stabilize the distorted cubane complex via multiple H-bonding contacts. Magnetic susceptibility studies reveal that cubane-like 1 is best described as a pair of independent antiferromagnetically coupled dimers with g = 2.10 and J/kB = -298 K (207 cm(-1)) (H = -2JS1.S2).
Lopez
Nazario
N
Department of Chemistry, University of Utah, 315 South 1400 East Street, Room 2020, Salt Lake City, Utah 84112-0850, USA.
Vos
Thomas E
TE
Arif
Atta M
AM
Shum
William W
WW
Noveron
Juan C
JC
Miller
Joel S
JS
D000465:Algorithms; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006845:Hydrocarbons, Fluorinated / Q000737:chemistry*; D006860:Hydrogen Bonding; D008958:Models, Molecular; D010422:Pentanones / Q000737:chemistry*
D006845:Hydrocarbons, Fluorinated; D010422:Pentanones; C518705:hexafluoroacetylacetonate; D003300:Copper