Simple rules for resolved level crossing spectra in magnetic field effects on reaction yields

In this work we derive conditions under which a level crossing line in magnetic field effect curve for a recombining radical pair will be equivalent to ESR spectrum, and discuss three simple rules for qualitative prediction of the level crossing spectra.

Solid phase synthesis and structural characterization of an oxo-molybdenum(V) porphyrin: triplet state ESR spectrum of μ-oxo bridged molybdenum(V) dimer

The solid state synthesis of molybdenum porphyrin using [ Mo ( NO )2( py )2( Cl )2] as the metal source and H 2 TPP (5,10,15,20-meso-tetraphenylporphyrin) in 3,5-dinitrobenzoic acid melt is described. Complex [ Mo V O ( TPP )(3,5- DNB )] (1) (3,5-DNB = 3,5-dinitrobenzoate ion) is isolated in almost quantitative yield. 1 is characterized by single-crystal X-ray structure analysis, electron paramagnetic resonance, electronic, FT-IR spectroscopy, and by magnetic moment measurements. 1 in basic alumina column on elution with DCM/Ethyl acetate as solvent hydrolyzed to μ-oxo bridged dimeric molybdenum(V) complex [{ Mo V ( O )( TPP )}2 O ] (2). 2 shows a interesting triplet state ESR spectrum in the solid state with half field signal suggesting two independent Mo ( V ) centers in the complex.