Continuous-Wave and Time-Resolved Electron Paramagnetic Resonance Study of Dimerized Aza-Crown Copper Porphyrins

Kandrashkin, Yu. E.; Iyudin, V. S.; Воронкова, В. К.; Mikhalitsyna, Elena A.; Tyurin, V. S.

doi:10.1007/s00723-013-0461-y

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2017

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“…In general, the EPR spectra can help in identifying the geometry a complex adopted by using the isotropic parameters A iso = (A ║ +A  )/3 and g iso = (g ║ +g  )/3. The values for planar symmetry are between A iso = 75-90 cm -1 and g iso = 2.06 -2.11 24,25 . From the result it was concluded that each metal centers were close to planar geometry.…”

Section: Fig 6: Esr Spectrum Ofmentioning

confidence: 99%

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2017

IJPSR

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Porphyrins are ever-present large class of naturally occurring macrocyclic compounds with many significant biological representatives comprising heme and chlorophyll. Novel bi-metallic porphyrins derived from [5-(4-hydroxyphenyl)-10,15,20-tri(4-methyl phenyl) porphyrin] and salicylideneamino-2-(N,N-dimethylamino) ethane copper (II) perchlorate was obtained in good yields. The results from various physico-chemical studies reveal a change in the geometry of the copper environment after coordination at the periphery of the porphyrin. The EPR of monocuperated metalloporphyrins have signals of copper with planar geometry and lacks the lines corresponding to peripheral metal due to dipolar broadening. Weak interaction between the metal centers is clear from nickel porphyrin.

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Section: Fig 6: Esr Spectrum Ofmentioning

confidence: 99%