title: High-frequency and -field EPR investigation of a manganese(III) N-confused porphyrin complex, [Mn(NCTPP)(py)2].
abstract: We report the first high-frequency and -field electron paramagnetic resonance (HFEPR) study of a Mn(III) N-confused porphyrin (NCP) complex (NCP is also known as inverted porphyrin or 2-aza-21-carbaporphyrin). We have found a striking variation in the electronic properties of the S = 2 Mn(III) ion coordinated by NCP compared to other Mn(III) porphyrinoid complexes. Thus, inversion of a single pyrrole ring greatly changes the equatorial ligand field exerted and leads to large magnitudes of both the axial and rhombic zero-field splitting [respectively, D = -3.084(3) cm(-1), E = -0.608(3) cm(-1)], which are unprecedented in other Mn(III) porphyrinoids.
authors.affiliation: Department of Chemistry, University of Akron, Akron, Ohio 44325, USA.
authors.forename: John D
authors.initials: JD
authors.lastname: Harvey
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Ziegler
authors.forename: Joshua
authors.initials: J
authors.lastname: Telser
authors.forename: Andrew
authors.initials: A
authors.lastname: Ozarowski
authors.forename: J
authors.initials: J
authors.lastname: Krzystek