title: Slow magnetic relaxations in manganese(III) tetra(meta-fluorophenyl)porphyrin-tetracyanoethenide. Comparison with the relative single chain magnet ortho compound.
abstract: Mn(III) tetra(meta-fluorophenyl)porphyrin-tetracyanoethenide coordination polymer (abbreviated meta-F) was synthesized and crystallographically and magnetically characterized. The compound crystallizes in the space group C2/c with four equivalent molecules in the unit cell arranged along two symmetry related nonparallel linear chain directions. Magnetic properties were studied by SQUID dc magnetization and ac susceptibility techniques and high field-high frequency electron spin resonance (HF-ESR). Glassy transition to a ferromagnetic-like state is observed at 10 K accompanied by slow magnetic relaxations. The glassiness is interpreted as due to 3D domain wall pinning. In a bias dc magnetic field the width of the relaxation time distribution decreases and the relaxations become similar to the relaxations of the single chain magnet Mn(III) tetra(ortho-fluorophenyl)porphyrin-tetracyanoethenide (abbreviated ortho-F), for which comparative HF-ESR studies were also conducted in this work. Magnetic properties of these two compounds are compared, and the nature of magnetic relaxations in meta-F is discussed.
authors.affiliation: Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland. z.tomkowicz@uj.edu.pl
authors.forename: Z
authors.initials: Z
authors.lastname: Tomkowicz
authors.forename: M
authors.initials: M
authors.lastname: Rams
authors.forename: M
authors.initials: M
authors.lastname: Bałanda
authors.forename: S
authors.initials: S
authors.lastname: Foro
authors.forename: H
authors.initials: H
authors.lastname: Nojiri
authors.forename: Y
authors.initials: Y
authors.lastname: Krupskaya
authors.forename: V
authors.initials: V
authors.lastname: Kataev
authors.forename: B
authors.initials: B
authors.lastname: Büchner
authors.forename: S K
authors.initials: SK
authors.lastname: Nayak
authors.forename: J V
authors.initials: JV
authors.lastname: Yakhmi
authors.forename: W
authors.initials: W
authors.lastname: Haase
mesh_terms: D018360:Crystallography, X-Ray; D059346:Magnets; D008665:Metalloporphyrins / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry
chemical_list: D008665:Metalloporphyrins; D009942:Organometallic Compounds; D011108:Polymers