The electronic spectra and circular dichroism of bis-l-tyrosinato copper(II)

Brown, Donald H.; Mangrio, Naghma; Smith, W. Ewen

doi:10.1016/0584-8539(79)80172-5

Cited by 4 publications

(1 citation statement)

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“…This also holds for the wavelength of the nonresolved visible absorption band, which is the sum of the bands, in the sequence of increasing energy, of the d z 2 ← d x 2 - y 2 , d xy ← d x 2 - y 2 and d xz , yz ← d x 2 - y 2 transitions for effective D 4 h symmetry. It may be concluded from single-crystal polarized and absorption electronic spectral studies that the wavelength of the visible band is nearly equal to the wavelength of the d xy ← d x 2 - y 2 band of medium energy and highest intensity. It is the energy of this band that has the greatest effect on g o .…”

Section: Resultsmentioning

confidence: 99%

A Two-Dimensional (Magnetic Field and Concentration) Electron Paramagnetic Resonance Method for Analysis of Multispecies Complex Equilibrium Systems. Information Content of EPR Spectra

et al. 2001

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A two-dimensional simulation method has been developed for the interpretation of electron paramagnetic resonance (EPR) spectra consisting of a multitude of strongly overlapping signal components. The set of EPR spectra for complex equilibrium systems is analyzed simultaneously as a function of metal and ligand concentrations and pH. The formation constants of the various species are adjusted together with the magnetic parameters of the component EPR spectra. At most 10 EPR-active and 5 EPR-silent species can be involved to simulate a maximum of 36 experimental spectra, while the number of adjusted parameters is at most 100. Statistical parameters are suggested to give the confidence intervals for parameter estimation and to distinguish alternative speciation models. The efficiency of the program is demonstrated for the copper(II)--L-asparagine system, in which 10 species, including 3 pairs of isomers, are characterized with magnetic parameters and formation constants. On the basis of the magnetic parameters, a structural assignment is made for the detected species. The two-dimensional approach can also supply the formation constant of the EPR-silent species, as demonstrated for the copper(II)--glycyl-L-serine system.

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Section: Resultsmentioning

confidence: 99%