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Volumn 127, Issue 19, 2005, Pages 7078-7093

Preparation of copper ion complexes of sterically congested diaryldiazomethanes having a pyridine ligand and characterization of their photoproducts

Author keywords

[No Author keywords available]

Indexed keywords

AROMATIC COMPOUNDS; COMPLEXATION; COPPER; FREE RADICALS; IONS; MAGNETIZATION; PARAMAGNETIC RESONANCE; SQUIDS; THERMODYNAMIC STABILITY;

EID: 18744383335     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja0424225     Document Type: Article
Times cited : (12)

References (103)
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    • note
    • 3 are the decay rates of the first- and second-order kinetics, respectively. The analysis was made by using Igor Pro 4 (WaveMetrics, Inc).
  • 94
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    • note
    • The measurements were carried out at this low concentration not only to avoid intermolecular magnetic interaction of sample and but also to increase photolysis efficiency. The latter is especially important because we generate magnetic species (carbene-Cu complexes) in situ by photolysis of precursory diazo-Cu complexes: carbene-Cu complexes show rather strong absorption bands at 470-480 nm, and hence, at higher concentration, the bands due to carbene-Cu complexes grow and overlap with the bands due to the starting complex (see Figures 7 and S6).
  • 96
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    • note
    • (a)Variable parameters in eq 2 are N and S and all others are constants or experimental values. Thus, S values are estimated by best-fitting the curvature of M versus H/T plot from eq 2 while N (in Avogadro numbers) is obtained by fitting the best-fitted curves to the vertical axis. F values are then obtained from sample concentration and quantity.
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    • note
    • (b) M values in Figures 9 and 12 were obtained from Ma - Mb, where Ma and Mb refer to the magnetization value after and before irradiation, respectively. This means that Mb is mostly magnetization due to copper ion (S = 1/2) in diazo-Cu complexes. Ma values will saturate more easily than Mb as a function of H since Ma values are larger than Mb values. Thus, M (= Ma - Mb) decreases at higher field.


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