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Spin Frustration in Triangular Cu 3 II Complexes with 6‐Methyl‐2‐pyridyloxime as Ligand – Synthesis, Structural, and Magnetic Characterization
Author(s) -
Escuer Albert,
Vlahopoulou Gina,
Lloret Francesc,
Mautner Franz A.
Publication year - 2014
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.201300910
Subject(s) - chemistry , electron paramagnetic resonance , antiferromagnetism , magnetic susceptibility , crystallography , frustration , copper , magnetization , ligand (biochemistry) , spin (aerodynamics) , paramagnetism , inorganic chemistry , stereochemistry , nuclear magnetic resonance , condensed matter physics , organic chemistry , magnetic field , biochemistry , physics , receptor , quantum mechanics , aerospace engineering , engineering
In the present work, new examples of μ 3 ‐OH/oximato Cu 3 triangles have been obtained by treatment of different copper salts with 6‐methyl‐2‐pyridylaldoxime [6‐MepyC(H)NOH, 6‐mepaoH]. Depending on the anion, the compounds [Cu 3 (OH)(6‐mepao) 3 (O 2 CPh) 2 ] ( 1 ), [Cu 6 (OH) 2 (6‐mepao) 6 (NO 3 ) 3 ](NO 3 ) · H 2 O ( 2· H 2 O) and [Cu 6 (OH) 2 (6‐mepao) 6 (ClO 4 ) 3 ](ClO 4 ) ( 3 ) formed and were characterized. Complex 1 is an isolated triangle, whereas 2 and 3 are hexanuclear compounds with two triangular subunits linked by anionic bridges. Susceptibility measurements show very strong antiferromagnetic interactions and the presence of antisymmetric exchange at low temperature. The magnetic properties of these frustrated triangles have been analyzed in terms of susceptibility, magnetization and electron paramagnetic resonance (EPR) experiments.