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Molecular Structures and Magnetism of Mn 12 Nanomagnets Containing the 3‐Thiophenecarboxylate Ligand
Author(s) -
Lim Jin Mook,
Do Youngkyu,
Kim Jinkwon
Publication year - 2006
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.200500727
Subject(s) - chemistry , ligand (biochemistry) , crystallography , magnetization , magnetism , nanomagnet , ion , single molecule magnet , relaxation (psychology) , magnetic susceptibility , magnetic relaxation , stereochemistry , psychology , social psychology , biochemistry , physics , receptor , organic chemistry , quantum mechanics , magnetic field
The new Mn 12 single‐molecule magnets containing thiophenyl ligands, [Mn 12 O 12 (O 2 CC 4 H 3 S) 16 (HO 2 CC 4 H 3 S)(H 2 O) 2 ] · 5CH 2 Cl 2 ( 1 ) and [Mn 12 O 12 (O 2 CC 4 H 3 S) 16 (H 2 O) 4 ] · 6CH 2 Cl 2 · 2H 2 O ( 2 ), have been synthesized by ligand‐substitution reactions of 3‐thiophenecarboxylic acid and [Mn 12 O 12 (O 2 CCH 3 ) 16 (H 2 O) 4 ] and investigated by magnetic measurements with a SQUID magnetometer. The X‐ray analysis of 1 shows five‐coordination geometry around the Mn III ion due to the unusual coordination of 3‐thiophenecarboxylic acid to the Mn III ion. Compound 1 displays two different rates of magnetization relaxation, which are faster than that of compound 2 because of structural distortion in the Mn 12 complex of 1 . Magnetic susceptibility measurements on 1 and 2 give the following parameters: U eff (the faster relaxation form of 1 ) = 51.81 K, 1/ τ 0 = 1.90 · 10 8 s –1 ; U eff (the slower relaxation form of 1 ) = 66.44 K, 1/ τ 0 = 1.50 · 10 8 s –1 ; U eff ( 2 ) = 67.09 K, 1/ τ 0 = 1.32 · 10 8 s –1 . (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)