Covalence Effect on the Second Moments of the ESR Absorption Curves. Case of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Na</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>[<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">II</mml:mi></

Buluggiu, E.; dall'Olio, A.; Dascola, G.; Varacca, V.

doi:10.1103/physrev.179.289

Cited by 11 publications

(5 citation statements)

References 11 publications

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“…This covalence can manifest itself in many ways, for example via reduction of spinorbit coupling at the metal ion,1 superchange interaction between near magnetic centers,5.8 or alterations in the dipolar interaction between magnetic centers. 9 There is probably also some direct relation between several cases of semiconduction and the covalent character of out-of-plane 71' bonds. 5 .…”

Section: Introductionmentioning

confidence: 98%

Covalent Bonding in Copper(II) Complexes Having N and S Atoms in a trans Arrangement

Buluggiu

Vera

Tomlinson

1972

The Journal of Chemical Physics

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Bonding in the chromophore trans-CuN2S2 has been investigated using ESR and electronic spectra of single crystals of Cu(II) doped (∼2%) trans-bis (thiosemicarbazide) Ni(II) sulfate trihydrate and trans-bis (thiosemicarbazide) Cu(II) nitrate. The unpaired electron is described, in the ``hole'' formalism, in terms of molecular orbitals of D2h symmetry. Crystal polarized spectra of the undiluted nitrate allow a reasonable, if not unambiguous, assignment of d–d bands. Combination of magnetic and optical results gives all bonding parameters, apart from those for the nonmagnetic Ag(d3z2−r2) orbital. All bonds, and particularly Cu–S, are highly covalent in character. The σ Cu–S bond is roughly twice as covalent as σ Cu–N bond. The out-of-plane π bonds, and in-plane σ bonds, show covalence similar to that observed in D4h (CuN4) chromophores and ∼ D4h (more strictly C4v) (CuS4+S). This suggests that bonds between two trans ligands and the copper ion are not influenced by the second pair of bonds in square planar complexes.

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Section: Introductionmentioning

confidence: 98%

Covalent Bonding in Copper(II) Complexes Having N and S Atoms in a trans Arrangement

Buluggiu

Vera

Tomlinson

1972

The Journal of Chemical Physics

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“…It has long been realised that delocalisation of magnetic electrons onto the surrounding ligand atoms would be important in modifying the point dipole approximation and a number of attempts to do this, one of which goes back to the early 1950's, have been made (34)(35)(36)(37)(38). These modifications are all characterised by particular distributions of 8-function spin density on metal ion and ligand atoms.…”

Section: Dipole-dipole Interactionmentioning

confidence: 99%

High Spin Systems

Pilbrow¹

1998

Foundations of Modern EPR

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My account of the development of coupling between two spin 1/2 ions and the development of computer simulation progrrams should be seen as complementary to the account in ch. H.6 by Eaton and Eaton in this volume. 185 Foundations of Modern EPR Downloaded from www.worldscientific.com by NANYANG TECHNOLOGICAL UNIVERSITY on 10/01/15. For personal use only.Foundations of Modern EPR 1) both are allowable outcomes of the theory. The addition of EPR to the repertoire of methods used to study coupled systems overcame the limitations of relying solely upon susceptibility measurements, measurements which, in the early days, were largely restricted to temperatures above 77K. This is a healthy reminder that there are sometimes inherent dangers in relying only upon one measurement technique. References

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“…I n connection with a preceding paper on the covalency effect on the second moments of the ESR absorption curves [5], we have examined some complexes of copper (11), with the same coordination as above, that have a remarkable interest for such type of study.…”

Section: Introductionmentioning

confidence: 99%

“…Several authors [1 to 41 have evaluated, by the analysis of ESR spectra, the covalency of many complexes, where the cupric ion coordinates ligands as N and 0 in square planar arrangement. I n connection with a preceding paper on the covalency effect on the second moments of the ESR absorption curves [5], we have examined some complexes of copper (11), with the same coordination as above, that have a remarkable interest for such type of study.…”

Section: Introductionmentioning

confidence: 99%