Abstract
Three new five-coordinate Cu-II complexes,
Cu(tpy)(phen-dione)(PF6)(2), Cu(phen)(phen-dione)ClPF6 and
Cu(bpy)(phen-dione)ClPF6(tpy=2,2';6',2 `'-terpyridine,
phen=1,10-phenanthroline and phen-dione=1,10-phenanthroline-5,6-dione)
have been prepared and characterized by elemental analysis, IR and
U-V-Vis spectroscopies and cyclic voltammetry.
The complex of Cu(tpy)(phen-dione)(PF6)(2) Crystallized with one
molecule of acetonitrile. The ORTEP drawing of
Cu(tpy)(phen-dione)(PF6)(2)center dot CH3CN shows that the
coordination geometry around Cu-II is a distorted trigonal-bipyramid.
Due to the steric hindrance of PF6- in the unit cell, the tpy ligands in
each complex cation cannot interact in a pi-pi fashion. The effective
magnetic moment (mu(eff)) of the complexes was measured by the Evans
method. The cyclic voltammograms at Pt disk electrode for these
complexes display only one reversible Cu(II)/Cu(I) redox couple. (C)
2007 Elsevier B.V. All rights reserved.
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