
%0 Journal Article
%A Curtis, Neil F. 
%A Gladkikh, Olga P. 
%A Heath, Sarah L. 
%A Morgan, Keith R. 
%T Some Di- and Tri-nuclear Compounds of Copper(II) with 4-Amino-4-methylpentan-2-one Oxime; Structures and Magnetism
%J Australian Journal of Chemistry
%D 2000/10/27
%V 53
%N 7
%P 577-582
%K Antiferromagnetism; copper; nickel; oxime; synthesis; X-ray diffractometry.
%R https://doi.org/10.1071/CH99177
%U https://www.publish.csiro.au/paper/CH99177 
%X Green &#91;&#123;Cu(amox)(amoxH)&#125;2&#93;(NO3)2 (amoxH = 4-amino-4-methylpentan-2-one oxime) has twofold symmetrical, oximato-bridged, dinuclear cations. Each copper(II) ion is bonded to the nitrogen atoms of one bidentate amox &#8211; and one bidentate amoxH (marked *) ligand &#123;Cu&#8211;Namine 2.039(4), 2.006(4)* &#197; and Cu&#8211;Noxime 1.975(5), 2.192(5)* &#197;&#125;. The dinuclear cations have bonds between each copper(II) ion and the oximato oxygen atom of the other (marked #) unit &#123;Cu&#8211;O# 2.062(4) &#197;, Cu&#8211;Cu# 3.801(5) &#197;&#125;. The copper(II) ion is in asymmetrical trigonal-bipyramidal coordination, with Namine*&#8211;Cu&#8211;Noximate axial &#123;176.5(2)&#x02DA;&#125;, and Namine&#8211;Cu&#8211;O# &#123;136.6(2)&#x02DA;&#125;, Namine&#8211;Cu&#8211;Noxime* &#123;126.2(2)&#x02DA;&#125; and Namine&#8211;Cu&#8211;O# &#123;96.9(2)&#x02DA;&#125; equatorial &#91;orthorhombic, Pbcn, a 12.218(1), b 23.361(3), c 12.275(1) &#197;, Z 4, R1 0.057 for 2239 reflections&#93;. The magnetic susceptibility values follow the Curie Weiss relation, with q = &#8211;10(2) K. Dark-green &#91;&#123;&#123;Cu(amox)&#125;3O&#125;2H&#93; (ClO4)3&#183;3H2O has threefold symmetrical trinuclear cations, with each copper(II) ion chelated by the amine &#123;Cu&#8211;N 1.977(3) &#197;&#125; and oxime &#123;Cu&#8211;N 1.994(2) &#197;&#125; nitrogen atoms of one amox &#8211; ligand, and coordinated by the bridging oximato oxygen atom of another amox &#8211; ligand &#123;Cu&#8211;O# 1.938(2) &#197;&#125;. A central oxygen atom on the threefold axis completes square-planar tetracoordination about each copper(II) ion &#123;Cu&#8211;O 1.910(1) &#197;&#125;. Cu&#8211;Cu# distances are 3.283(2) &#197;, with the central oxygen atom 0.233(2) &#197; out of the Cu3 plane. Two of these tri-nuclear cations are linked confacially by a proton on the common threefold axis &#123;O&#8211;O# 2.474(1) &#197;&#125;, to form novel hexanuclear clusters, with dihedral angles about the central Cu&#8211;O&#8211;O#&#8211;Cu# axis of 37.4(1)&#x02DA;. Distances Cu&#8211;Cu# between the triangles are 3.180(5), 3.860(5) and 4.738(5) &#197; &#91;trigonal, R3 &#8211; c, a 23.932(5), c 18.581(4) &#197;, Z 12, R1 0.034 for 1660 reflections&#93;. The magnetic susceptibility values indicate extensive antiferromagnetic spin-coupling within the triangles. A blue compound of stoichiometry Cu(amox)(H2O)(NO3) has susceptibility values supporting a di-nuclear spin-coupled structure. 
