Electron paramagnetic resonance of trans-disubstituted bis(ethylenediamine)chromium(III) complexes in frozen solutions

Near-infrared 2Eg → 4A2g and visible LMCT luminescence from a molecular bis-(tris(carbene)borate) manganese(IV) complex

“…25 Spectra plotted to match intensity of the highest band are given in Fig. S1 [32][33][34][35] and Mn(IV). 31,[36][37][38][39] This result indicates that there is nothing unusual about the spin quartet ground state of the title complex.…”

Reflections on small molecule manganese models that seek to mimic photosynthetic water oxidation chemistry

“…To resolve this issue, it became important to understand the EPR spectroscopy of mononuclear Mn centers. The EPR spectra of d 3 Mn IV and Cr III ions in an axial field (E/D = 0) are often difficult to interpret as they greatly depend on the magnitude of the zero-field splitting (zfs) parameters [27][28][29]. A simplification may be achieved when the axial zfs parameter D is either much greater than the applied microwave frequency (2D hν) or much smaller than (2D hν) (hν ≈ 0.31 cm −1 at X-band frequencies).…”

Synthesis and characterization of manganese(IV) and ruthenium(III) complexes derived from bis (2-hydroxy-1-naphthaldehyde)oxaloyldihydrazone

“…Distortion and spin-orbit coupling split the ground state quartet into two Kramer's doublets separated by 2(D 2 þ E 2 ) where D and E are axial and rhombic zero field splitting parameters, respectively. The complexity of an ESR spectra of a d 3 ion in an axial field (E/D ¼ 0) is dependent on the magnitude of zero field splitting parameters [51,52]. Two limiting cases are when the value of axial zero field splitting parameters, 2D, is either much larger or much smaller than h (0.31 cm À1 at Xband frequencies).…”