title: Stoichiometric sensitivity and structural diversity in click-active copper(I) N,S-heterocyclic carbene complexes.
abstract: 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.
authors.affiliation: Department of Chemistry, National University of Singapore, 3 Science Drive 3, Kent Ridge, Singapore 117543, Singapore. andyhor@nus.edu.sg.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Han
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Weng
authors.forename: David James
authors.initials: DJ
authors.lastname: Young
authors.forename: Guo-Xin
authors.initials: GX
authors.lastname: Jin
authors.forename: T S Andy
authors.initials: TS
authors.lastname: Hor