Abstract
Electron paramagnetic resonance spectra and nitrogen ENDOR powder spectra have been obtained from copper complexes of tetraphenylporphyrin, meso-tetrakis(2-methylpyridinium-N-yl)porphyrin (ortho), meso-tetrakis(4-methylpyridinium-N-yl)porphyrin (para), and phthalocyanine at approximately 4 K. All four samples display axial symmetry. The three posphyrins have nearly identical g x and g r values (2.054, 2.055) but differ in their g z values (2.186, 2.209, 2.212)
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