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Tetranuclear Homo‐ and Heterometallic Manganese(III) and Nickel(II) Complexes: Synthesis, Structure, and Magnetic Studies
Author(s) -
Nayak Sanjit,
Novitchi Ghenadie,
Muche Simon,
Luneau Dominique,
Dehnen Stefanie
Publication year - 2012
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201100525
Subject(s) - nickel , cubane , crystallography , manganese , salicylaldehyde , chemistry , antiferromagnetism , ground state , ferromagnetism , magnetic susceptibility , ligand (biochemistry) , magnetization , infrared spectroscopy , schiff base , crystal structure , magnetic field , condensed matter physics , physics , biochemistry , receptor , organic chemistry , quantum mechanics
Three new polynuclear cluster complexes were synthesized and characterized using single‐crystal X‐ray measurements, infrared spectroscopy, and elemental analyses. A Schiff‐base, 2‐{[(1‐hydroxybutan‐2‐yl)imino]methyl}phenol (himpH 2 ), synthesized in situ from the reaction of salicylaldehyde and (±)‐2‐aminobutanol, was used as ligand. Reactions of the ligand with different Mn II and Ni II salts led to two homometallic complexes and a heterometallic complex with [Mn III 4 ] ( 1 ), [Ni II 4 ] ( 2 ), and [Mn III 2 Ni II 2 ] ( 3 ) cores exhibiting square, cubane‐type, or butterfly arrangement, respectively. Analysis of the temperature dependence of the magnetic susceptibility of compounds 1 – 3 , using appropriate spin Hamiltonians, indicated that the [Mn III 4 ] and [Ni II 4 ] compounds show dominant ferromagnetic coupling of the spin carriers, whereas the [Mn 2 Ni 2 ] compound has antiferromagnetic Mn III –Ni II and ferromagnetic Ni II –Ni II interactions, with a spin ground state S t = 2. Analyses of the magnetization data in 0–5 T fields at 2 K indicate the presence of positive zero‐field splitting (ZFS) values, which is consistent with the absence of slow magnetic relaxation.