Stoichiometric sensitivity and structural diversity in click-active copper(I) N,S-heterocyclic carbene complexes

A series of novel Cu(I) N,S-heterocyclic carbene (NSHC) complexes [Cu(μ-Br)(NSHC)]2, [Cu(μ-X)(NSHC)]4 (X = Br or I), [(NSHC)2Cu(μ-Br)2Cu(NSHC)], and [(NSHC)2CuBr] have been isolated from in situ generated CuO(t)Bu and N-substituted benzothiazolium halides and characterized by X-ray crystallography....

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2014-01, Vol.43 (3), p.1305-1312
Main Authors: Han, Xiaoyan, Weng, Zhiqiang, Young, David James, Jin, Guo-Xin, Hor, T S Andy
Format: Article
Language:English
Subjects:
Alkynes
Carbenes
CATALYSTS
Catalytic activity
COPPER OXIDE
Crystallography
Cycloaddition
Halides
Separation
STOICHIOMETRY
X RAYS
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Summary:A series of novel Cu(I) N,S-heterocyclic carbene (NSHC) complexes [Cu(μ-Br)(NSHC)]2, [Cu(μ-X)(NSHC)]4 (X = Br or I), [(NSHC)2Cu(μ-Br)2Cu(NSHC)], and [(NSHC)2CuBr] have been isolated from in situ generated CuO(t)Bu and N-substituted benzothiazolium halides and characterized by X-ray crystallography. Five structural motifs were observed, viz. M(x)L(y) where x : y = 2 : 2, 4 : 4, 2 : 3, 1 : 2 and 2 : 4, with Cu···Cu separation traversing over a wide range of 2.5626(7) to 3.4725(7) Å distances. A preliminary investigation of the catalytic activity of these compounds indicated that the unusual mononuclear complex 6 [(NSHC)2CuBr] is an active catalyst for the Huisgen 1,3-dipolar cycloaddition of azide and alkynes while complexes 1-5 and 7 were marginally less active.
ISSN:1477-9226
1477-9234
DOI:10.1039/c3dt52059e