Tethered Polynuclear Copper–Chalcogenolate Assemblies Enabled via NHC Ligation

Abstract

The polynuclear copper−chalcogenolate complexes, 1,1′-fc[CH 2 ECu-(IPr)] 2 (E = S (1), E = Se (2); fc = ferrocenyl; IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene), [1,4-{CH 2 ECu(IPr)} 2 C 6 Me 4 ] (E = S (3), E = Se (4)), and 1,2,4,5-[{( Cy CAAC)CuSeCH 2 } 4 (C 6 H 2 )] 5 ( Cy CAAC = cyclic (alkyl)(amino)carbene; Cy = cyclohexyl) can be prepared in one-step reactions from the corresponding polychalcogenotrimethylsilanes fc(CH 2 ESiMe 3 ) 2 /1,4-(Me 3 SiECH 2 ) 2 (C 6 Me 4 )/1,2,4,5-(Me 3 SiSeCH 2 ) 4 (C 6 H 2 ) and [(IPr)CuOAc]/[( Cy CAAC)CuOAc], respectively. The polychalcogenotrimethylsilanes react under mild conditions to provide the (NHC/ CAAC)copper−chalcogenolates with trimethylsilylacetate as the side product. The preparation of these complexes represents a straightforward route to incorporate a number of metal chalcogenolate groups onto central organic/organometallic supports. The new complexes 1−5 have been characterized by multinuclear NMR spectroscopy and single-crystal X-ray diffraction.