ESR SPECTRA OF THE SQUARE PLANAR COPPER(II) COMPLEXES WITH VARIOUS N4-MACROCYCLIC LIGANDS

Abstract The ESR parameters were determined for copper(II) complexes with various 14-, 15- and 16-membered N4-macrocyclic ligands. Of these ESR parameters g‖ has the most simple relation to the covalency of the coordination bonds in the present compounds, i.e., the smaller the g‖ value the larger the covalency. The order of covalencies derived from the g‖ values nicely matches with that supposed from the size of macrocyclic rings and the charge of the ligands. The approach to the estimation of covalency of the coordination bonds by use of copper hyperfine coupling constant was examined, but it was found that this approach gives rather unreliable results for the present compounds.

[1]  Y. Nishida,et al.  Ground States of the Square Planar Low-Spin Cobalt(II) Complexes , 1978 .

[2]  Y. Nishida,et al.  Electronic structures of square planar cobalt(II), nickel(II) and copper(II) complexes with some N4-macrocyclic ligands [1] , 1978 .

[3]  S. Peng,et al.  Cofacial dimer of a dihydrooctaaza[14]annulene complex containing a nickel-nickel bond and related monomeric complexes , 1976 .

[4]  D. Busch,et al.  Progress toward the development to totally synthetic heme-protein models--the use of substituents to control the oxidation-reduction properties of metal ions in complexes with macrocyclic ligands. , 1976, Journal of the American Chemical Society.

[5]  D. Black,et al.  Metal template synthesis of macrocyclic amide complexes , 1976 .

[6]  R. Frankel,et al.  Synthesis and ground state electronic properties of tetraaza macrocyclic iron(II, III) complexes containing [14]-, [15]-, and [16]-membered rings , 1975 .

[7]  D. Busch,et al.  Oxidation and reduction behavior of macrocyclic complexes of nickel. Electrochemical and electron spin resonance studies , 1974 .

[8]  R. H. Holm,et al.  Synthetic approaches to 14-, 15-, and 16-membered tetraaza macrocycles and their metal complexes , 1973 .

[9]  Johannes Martin,et al.  Square-planar nickel(II) and copper(II) complexes containing 14- and 15-membered tetraaza macrocyclic ligands , 1973 .

[10]  J. Zink,et al.  Interpretation of electron spin resonance parameters for transition metal complexes , 1972 .

[11]  D. C. Olson,et al.  Cyclic amine complexes of nickel(I), -(II), and -(III). Electrochemistry, preparation, and properties , 1971 .

[12]  Y. Hsu.  E.P.R. studies of three cupric complexes with nitrogenous ligands , 1971 .

[13]  D. Black,et al.  Metal template reactions. III. Synthesis of macrocyclic quadridentate nickel(II) complexes from a suitable diamino dialdehyde , 1970 .

[14]  H. Neunhoeffer,et al.  Die synthese von dihydro-1,2,4,5,8,9,11,12-octaaza-[14]-annulenen 1.Mitt. , 1970 .

[15]  D. W. Smith.  Relationship between electron spin resonance g-values and covalent bonding in tetragonal copper(II) compounds , 1970 .

[16]  M. Abkowitz,et al.  ESR of α‐Copper Phthalocyanine. II. Powder Line Shape and MO Calculations , 1969 .

[17]  J. Raynor,et al.  Electron spin resonance spectrum of copper-63 phthalocyanin. A reassessment of the bonding parameters , 1969 .

[18]  R. G. Hayes.  Ligand Hyperfine Couplings and the Structure of Transition-Metal Complexes , 1969 .

[19]  N. F. Curtis.  Macrocyclic coordination compounds formed by condensation of metal-amine complexes with aliphatic carbonyl compounds , 1968 .

[20]  B. Mcgarvey.  The isotropic hyperfine interaction , 1967 .

[21]  E. Uhlig,et al.  Untersuchungen an Oximkomplexen. III. Nickelchelate des Bis‐(diacetylmonoxim‐imino)‐propans‐1,3 und des Bis‐(diacetylmonoxim‐imino)‐äthans‐1,2 , 1966 .

[22]  J. Assour.  Electron Spin Resonance of Tetraphenylporphine Chelates , 1965 .

[23]  D. Busch,et al.  The Magnetic Properties of Nickel(II) Complexes Containing a Macrocyclic Ligand and the Existence of a High Spin-Low Spin Equilibrium , 1964 .

[24]  J. D. Swalen,et al.  Electron Paramagnetic Resonance Spectra of Copper Complexes , 1962 .

[25]  D. Kivelson,et al.  ESR Studies on the Bonding in Copper Complexes , 1961 .

[26]  W. S. Koski,et al.  An Electron Spin Resonance Study of Copper Etioporphyrin II1 , 1960 .

[27]  A. Maki,et al.  Electron Spin Resonance in Transition Metal Chelates. II. Copper(II) Bis-Salicylaldehyde-Imine , 1958 .

[28]  A. Maki,et al.  Electron Spin Resonance in Transition Metal Chelates. I. Copper (II) Bis-Acetylacetonate , 1958 .