TheDParameter (EPR Zero-Field Splitting) of Localized 1,3-Cyclopentanediyl Triplet Diradicals as a Measure of Electronic Substituent Effects on the Spin Densities inPara-Substituted Benzyl-Type Radicals

1996 ◽  
Vol 61 (20) ◽  
pp. 7056-7065 ◽  
Author(s):  
Waldemar Adam ◽  
Fumio Kita ◽  
Heinrich M. Harrer ◽  
Werner M. Nau ◽  
Rainer Zipf
Keyword(s):  
Substituent Effects ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Spin Densities

Substituent Effects on the Zero-Field Splitting Parameters of Localized Triplet, 1,3-Cyclopentanediyl Biradicals

1993 ◽  
Vol 32 (9) ◽  
pp. 1339-1340 ◽  
Author(s):  
Waldemar Adam ◽  
Lothar Fröhlich ◽  
Werner M. Nau ◽  
Hans-Gent Korth ◽  
Reiner Sustmann
Keyword(s):  
Substituent Effects ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting

Substituent effects on the zero-field splitting parameters of diarylmethylene. Evidence for merostabilization in appropriately substituted diphenylmethylenes

1979 ◽  
Vol 57 (19) ◽  
pp. 2652-2661 ◽  
Author(s):  
Robert W. R. Humphreys ◽  
Donald R. Arnold
Keyword(s):  
Valence Bond ◽  
Substituent Effects ◽  
Esr Spectra ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Triplet Ground State ◽  
Zero Field Splitting Parameter ◽  
Spin Resonance ◽  
Splitting Parameter

An analysis of the temperature dependence (4–30 K) of the electron spin resonance (esr) spectra of substituted diphenylmethylenes (e.g. para-, para′-; methoxy, cyano, dimethylamino, and nitro) indicates all of these species have a triplet ground state. The variation in the zero-field splitting parameter D for this series of methylenes provides evidence that the average separation of the unpaired electrons is greatest for the unsymmetrically substituted derivatives, those having a strong para-electron-withdrawing substituent and a strong para′-electron-donating substituent. This result is explained in terms of a favourable contribution of charge-separated valence-bond structures, i.e., merostabilization.

Correlating the axial Zero Field Splitting with the slow magnetic relaxation in GdIII SIMs

2021 ◽  
Author(s):  
Júlia Mayans ◽  
Albert Escuer
Keyword(s):  
Magnetic Relaxation ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Slow Magnetic Relaxation

A possible relation between the value of the axial Zero Field Splitting and the occurrence of field-induced slow magnetic relaxation has been established for a new gadolinium(iii) compound.

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