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Dalton Transactions Vol - 39 Issue - 6

Dalton Transactions Vol - 39 Issue - 5

Dalton Transactions Vol -0

Chiral transition metal clusters from two enantiomeric schiff base ligands. Synthesis, structures, CD spectra and magnetic properties

Content Provider	Royal Society of Chemistry (RSC)
Author	Fan, Lin-Lin Guo, Fu-Sheng Leng, Ji-Dong Tong, Ming-liang Yun, Lei Lin, Zhuo-Jia Ou, Yong-Cong Herchel, Radovan
Copyright Year	2010
Abstract	Two enantiomeric Schiff base ligands R-/S-H2Lin situ generated from the condensation of o-vanillin with R- or S-2-phenylglycinol were applied to assemble chiral multinuclear transition metal magnetic clusters for the first time. Four new enantiomerically pure chiral clusters, [NaMn4(μ3-O)(N3)1.75Br0.25(R-L)3(MeOH)2(H2O)2][NaMn4(μ3-O)(N3)2(R-L)3(MeOH)2(H2O)2]Br4 (1R), [NaMn4(μ3-O)(N3)1.75Br0.25(S-L)3(MeOH)2(H2O)2][NaMn4(μ3-O)(N3)2(S-L)3(MeOH)2(H2O)2]Br4 (1S), [Cu6(R-L)2(R-HL)2(N3)5(MeOH)]NO3·2MeOH·H2O (2R) and [Cu6(S-L)2(S-HL)2(N3)5(MeOH)]NO3·2MeOH·H2O (2S), have been synthesized and characterized by single crystal X-ray crystallography and CD spectroscopy. Three Mn(III) in the MnIIMnIII3 clusters of 1R and 1S are joined together through the μ3-O bridge to form an oxo-centered Mn3O unit. Three L2− link four manganese atoms via the μ2-O,N,O-bridging manner into a MnIIMnIII3 cluster in a distorted tetrahedral geometry. Enantiomeric 2S and 2R are hexanuclear copper(II) clusters composed of a cubane-like Cu4L4 part with a dinuclear Cu2(N3)2 unit capped on one of the faces of the Cu4L4 cubane via the μ1,1-azide and phenolate bridges from the chiral ligands. Magnetic analysis reveals intracluster antiferromagnetic interaction between adjacent manganese ions in chiral oxo-centered MnIIMnIII3 magnetic clusters for 1R and 1S, and dominating antiferromagnetic over weak ferromagnetic interactions in Cu6 clusters in 2R and 2S.
Starting Page	1771
Ending Page	1780
Page Count	10
File Format	HTM / HTML PDF
ISSN	14779226
Volume Number	39
Issue Number	7
Journal	Dalton Transactions
DOI	10.1039/b917091j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Schiff Schiff base Chirality Transition metal Water of crystallization X-ray crystallography Spectroscopy Manganese Molecular geometry Copper Cubane Azide Antiferromagnetism Ferromagnetism
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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