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Two Locally Chiral Dysprosium Compounds with Salen‐Type Ligands That Show Slow Magnetic Relaxation Behavior
Author(s) -
Zhang Li,
Zhang Peng,
Zhao Lang,
Lin ShuangYan,
Xue Shufang,
Tang Jinkui,
Liu Zhiliang
Publication year - 2013
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.201201336
Subject(s) - dysprosium , chemistry , triethanolamine , crystallography , lanthanide , ion , ligand (biochemistry) , relaxation (psychology) , chirality (physics) , molecule , crystal structure , homoleptic , stereochemistry , inorganic chemistry , metal , analytical chemistry (journal) , quark , social psychology , biochemistry , psychology , receptor , chiral symmetry breaking , physics , organic chemistry , chromatography , quantum mechanics , nambu–jona lasinio model
Abstract Two Dy compounds, [Dy 4 (μ 4 ‐O)L 2 (C 6 H 5 COO) 6 ] · 3CH 3 OH ( 1 ) and [Dy 2 L(H 2 L)(teaH 2 )(o‐vanillin)(H 2 O)](ClO 4 ) 2 · 2CH 3 OH · H 2 O ( 2 , teaH 3 = triethanolamine), were assembled by the reactions of the salen‐type ligand N , N′ ‐bis(3‐methoxysalicylidene)‐1,2‐cyclohexanediamine (H 2 L) and different dysprosium salts and bases. These compounds show both local chirality and slow magnetic relaxation. The former is induced by an unprecedented coordination mode of the ligand H 2 L, in which the N 2 O 2 pocket encapsulates one Dy ion. Compound 1 , which has four Dy ions in distinct coordination environments, demonstrates the rare Dy 4 tetrahedron motif supported by a central μ 4 ‐O atom, which is akin to a chiral carbon atom in organic molecules, as revealed by single‐crystal X‐ray analyses. In contrast, the formation of 2 , which shows an unusual structural motif with a tail, is driven by the presence of triethanolamine. In spite of the low‐symmetry coordination geometry around each Dy ion, both compounds display slow magnetic relaxation behavior, but with fast quantum tunneling relaxation, as indicated by alternating current (ac) susceptibility measurements.