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A Pair of Enantiopure Cubane‐Type Cu II 4 O 4 Clusters: Synthesis, Structure, Chirality and Magnetism
Author(s) -
Yin Ji,
Yin TingTing,
Gao Chen,
Wang BingWu,
Zhu YuanYuan,
Wu ZongQuan,
Gao Song
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.201402608
Subject(s) - chemistry , cubane , enantiopure drug , crystallography , chirality (physics) , enantiomer , antiferromagnetism , magnetism , cluster (spacecraft) , crystal structure , ligand (biochemistry) , stereochemistry , axial chirality , enantioselective synthesis , catalysis , physics , biochemistry , nambu–jona lasinio model , receptor , condensed matter physics , quantum mechanics , computer science , programming language , chiral symmetry breaking , quark
A pair of enantiopure cubane‐type Cu II 4 O 4 clusters was constructed from simple chiral ligands ( R or S )‐2‐[(2‐hydroxy‐1‐phenylethylimino)methyl]phenol (H 2 L R or S ). Single‐crystal X‐ray diffraction studies demonstrated that complexes 1 R and 1 S are enantiomers. They consist of a Cu II 4 O 4 cubane core in which the four Cu II centres are linked by a μ 3 ‐oxo bridge. The four Cu II ions in one cluster are all in a distorted square‐pyramidal geometry. Circular dichroism (CD) spectroscopy also confirmed that complexes 1 R and 1 S are enantiomers and that the chirality was successfully transferred and amplified from the ligand to the coordination environment of the Cu II ions. Magnetic susceptibility measurements show an overall antiferromagnetic interaction which could be fitted by using MAGPACK with a two parameter model ( J 1 = –5.58 cm –1 , J 2 = 3.80 cm –1 ).