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A Mixed‐Valence [Mn II Mn III Mn II ] Complex of a Linear Phenol–bis(pyrazole) Ligand with an S = 3 Spin Ground State
Author(s) -
Barrios Leoní A.,
Aromí Guillem,
Ribas Joan,
Salinas Uber Jorge,
Roubeau Olivier,
Sakai Ken,
Masaoka Shigeyuki,
Gamez Patrick,
Reedijk Jan
Publication year - 2008
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200800431
Subject(s) - chemistry , ground state , manganese , valence (chemistry) , ion , antiferromagnetism , crystallography , coupling constant , pyrazole , magnetic susceptibility , inorganic chemistry , stereochemistry , atomic physics , condensed matter physics , physics , organic chemistry , particle physics
A novel ligand featuring one phenol and two pyrazole groups in a linear fashion was prepared. This donor facilitates the assembly of a mixed‐valence chain of Mn ions in the[Mn II Mn III Mn II ] sequence, with formula [Mn 3 (Hpbpz) 2 (OAc) 3 (MeOH) 3 ] ( 1 ). Complex 1 exhibits dominant antiferromagnetic coupling between adjacent pairs of Mn ions. A fit of the magnetic susceptibility data using the Hamiltonian H = –2 J 1 ( S 1 S 2 + S 2 S 3 ) – 2 J 2 ( S 1 S 3 ) yields coupling constants of J 1 = –3.14 cm –1 and J 2 = –0.39 cm –1 , which leads to a spin ground state of S T = 3. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)