NDLI: Structure and dimensionality of coordination complexes correlated to piperazine conformation: from discrete [CuII2] and [CuII4] complexes to a μ1,3-N3− bridged [CuII2]n chain

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Dalton Transactions Vol - 0 Issue - 7

Dalton Transactions Vol - 0 Issue - 6

Dalton Transactions Vol - 0 Issue - 5

Structure and dimensionality of coordination complexes correlated to piperazine conformation: from discrete [Cu^II₂] and [Cu^II₄] complexes to a μ_1,3-N₃⁻ bridged [Cu^II₂]_n chain

Content Provider	Royal Society of Chemistry (RSC)
Author	Aromí, Guillem Huang, Xiaoying Ray, Debashis Paital, Alok Ranjan Mandal, Debashree Li, Jing
Copyright Year	2009
Abstract	Three different types of copper(II) complexes have been studied of the hexadentate Schiff base ligand N,N′-bis[2-{(salicylidenimine)amino}ethyl] piperazine (H2L) having the piperazine backbone in the chair form and axial–axial (a,a) N-atom lone pairs in the free state. The structure of the products is influenced by the reaction conditions and by the exogenous ligands, affecting the conformation of the piperazine moiety (primary structure) and the topology and nuclearity of the resulting complexes (secondary structure). In [Cu2L(DMF)2]X2 (X = ClO4−, 1a; NO3−, 1b), the lone-pairs of chair-piperazine adopt the equatorial–equatorial (e,e) conformation. In the presence of NEt3 and NaN3, two types of [CuII4] complexes [Cu4(L)2(OH)2(H2O)2]X2·nH2O (X = ClO4−, n = 1, 2a; X = NO3−, n = 4, 2b) and [Cu4(L)2(N3)2(H2O)2]X2·H2O (X = ClO4−, 3a; NO3−, 3b) are obtained where four copper(II) ions are bridged by two hexadentate μ3-piperazine ligands, this time in chair–e,a conformation, and by two OH and N3groups. In CH3CN, reactions of 1, 2 or 3 with NaN3 always produce the double end-to-end azido bridged 1D polymer [Cu2L(N3)2]n (4) having a chair-e,e piperazine backbone. All studied conformations of the piperazine bridge mediate antiferromagnetic interactions between the Cu(II) ions, as revealed by bulk magnetization measurements. The striking difference in intensity of the coupling through trans-e,e piperazine observed for complexes 1a and 4 might be due to complementarily effects between the ligands involved.
Starting Page	1352
Ending Page	1362
Page Count	11
File Format	HTM / HTML PDF
ISSN	14779226
Volume Number	0
Issue Number	8
Journal	Dalton Transactions
DOI	10.1039/b814681k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Schiff Copper Schiff base Ligand Piperazine Conformational isomerism Topology Biomolecular structure Properties of water Acetonitrile Polymer Antiferromagnetism
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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