Electron spin resonance study of the copper(II) chelates of certain monothio-.beta.-diketones and diethyldithiocarbamate

ESR of Copper in Biological Systems

“…P(n, cf>, e) is the transition probability and includes a factor which represents the effect of the g anisotropy and G (B, n, e, cf» is the lineshape function. The factor !l cos eAcf> is the solid angle segment for those copper II sites for which B lies between e and e + !le The values of B may usually be calculated quite satisfactorily for copper II using second-order perturbation theory (e.g., Bleaney, 1951;Toy et al, 1971). They may, alternatively, be obtained numerically by means of computer diagonalization (e.g., Lowrey and Pilbrow, 1977).…”

Temperature and Orientation Dependence of Electron-Spin Relaxation Rates for Bis(diethyldithiocarbamato)copper(II)

“…CW spectra were simulated with a locally written program, MONMER, that uses perturbation calculations, assumes that the principal axes of the g and A matrices are collinear, and treats hyperfine interaction to second order (7). (1/T 1 ) Å n log(T ) / C with n Å 2.41 for the doped solid and n Å 2.56 for the glassy solution.…”

The world as viewed by and with unpaired electrons

“…Positions of the pump (solid arrows) and observe (dashed arrows) pulses are shown on the field-swept echo-detected spectra for an enzymatically reduced, spin-labeled protein (top). Contributions from MTSL [241] (short dashes) and FAD SQ −• [242] (long dashes) to the field-swept echo-detected spectra were simulated using a locally written program [243] and are shown, with arbitrary y-axis scales. Time domain DEER dipolar evolution signals for enzymatically reduced, spin-labeled protein (95 μM MTSL, ~45 μM FAD SQ −• ) were recorded at 80 K, averaging 23 scans overnight, followed by a 2 nd degree polynomial background subtraction (bottom).…”