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An Oxide‐Centered Trinuclear Manganese(III) Compound with a Bulky Phenol‐Pyrazolate Ligand
Author(s) -
VicianoChumillas Marta,
Tanase Stefania,
Roubeau Olivier,
Teat Simon J.,
de Jongh L. Jos,
Reedijk Jan
Publication year - 2010
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.200901007
Subject(s) - chemistry , manganese , antiferromagnetism , deprotonation , ligand (biochemistry) , phenol , crystallography , magnetic susceptibility , pyrazole , ion , methanol , inorganic chemistry , oxide , medicinal chemistry , stereochemistry , organic chemistry , receptor , biochemistry , physics , condensed matter physics
Abstract A new oxide‐centered trinuclear manganese(III) compound with the formula [Mn 3 (μ 3 ‐O)(naphpz) 3 (O 2 CMe)(MeOH) 2 ] n ( 1 ) {H 2 naphpz = 2‐[1 H ‐pyrazol‐5(3)‐yl]naphthalen‐1‐ol} has been synthesized and characterized. Three bulky doubly deprotonated phenol‐pyrazole ligands are coordinated to the three manganese(III) ions with a μ 3 ‐oxide bridge in the same plane. Methanol and acetate ligands are at the apical positions of the manganese(III) ions. The trinuclear units are bridged by acetate ligands in the anti‐anti mode, leading to the formation of 1‐D chains. Temperature‐dependent magnetic susceptibility studies indicate the presence of overall antiferromagnetic interactions with magnetic exchange constants of J 1 ≈ –1.9 and J 2 ≈ –5.5 cm –1 and g = 1.91. Weak antiferromagnetic interactions ( zJ′ = –0.37 cm –1 ) between the trinuclear units in the 1‐D chain (and between the chains) in compound 1 are present.