Electron paramagnetic resonance studies on copper(II) benzoate

Abstract

An electron paramagnetic resonance (e.p.r.) study at 9.1 and 12.0 GHz on polycrystalline copper(1I) benzoate has given the following Spin Hamiltonian parameters for the binuclear molecule: D = 0.3311 i. 0.0006 cnl-l, E = 0.0147 i. 0.0003 cm-l, g, = 2.048 f 0.004, g, = 2.074 2 0.004, g, = 2.345 + 0.004. Using the average g value of 2.160 f 0.004 obtalned from e.p.r. and previously published magnetic susceptibility studies, 2 J is estimated to be 333 cm-'.

How Metal Ions Affect Amyloid Formation: Cu2+‐ and Zn2+‐Sensitive Peptides

“…In order to minimize the EPR signal of aqueous Cu 2 + ions CuA C H T U N G T R E N N U N G (OAc) 2 was used because it forms dimers in frozen solution. The Cu-Cu dimer EPR spectrum is well known, [33] but was not observed in our spectra. Thus, the obtained signal exclusively arose from peptide-bound Cu 2 + .…”

Electron-spin delocalization in antiferromagnetic dimeric copper(II) benzoates

“…Furthermore the zero field splittings are only about 0.33 cm-1. 21 Although the dipolar shifts were calculated treating the copper ions as completely uncoupled species with 5 = y2, the isotropic shifts listed in Table II are for strongly coupled ions with significant populations in the diamagnetic ground states. The fraction in the triplet state for any particular compound is given by the ratio Xm (observed) / xm (theoretical), i.e., jues2 (observed)/ /¿eff2(theoretical).…”

Synthesis and properties of bis(N,N-dialkylthioselenocarbamato)nickel, -palladium, and -platinum: M[SSeCNR2]2 (M = nickel(II), palladium(II), platinum(II); R = methyl, ethyl)

“…Trans to S 6.596 6.57 6.63 6.58 " The pmr spectra of these complexes in chloroform or dichloromethane have already been reported,1•10•11 but in order to compare the N-CH3 proton chemical shifts precisely the redetermination has been carried out in the same solvent. 6 Previously reported value in chloroform is 6.65 ppm.10 chemical shifts of these tin (IV) complexes and those of the nickel(II), palladium(II), and platinum(II) complexes, the quartet and the triplet at the lower magnetic field of the detsc complexes may tentatively be assigned to the N-CH2 and C-CH3 protons trans to the selenium atom in a given ligand, while those in the higher field may be assigned to the N-CH2 and C-CHs protons trans to the sulfur.…”

“…Trans to Se Trans toS Trans to Se Trans to S Measured in ca. 3 wt % chloroform solution 6. Measured in Nujol mulls.…”