Binuclear cyclopalladated pincer compounds bridged by ditopic nitrogenated ligands

摘要

The binuclear cyclopalladated compounds [(SCS)Pd-pz-Pd(SCS)][BF _4]_2 (pz = pyrazine) 2a, [(SCS)Pd-bipy-Pd(SCS)][BF 4]2 (bipy = 4,4′-bipyridine) 2b, [(SCS)Pd-dcb-Pd(SCS)][BF_4]_2 (dcb = 1,4-dicyanobenzene) 2c and [(SCS)Pd-tmeda-Pd(SCS)][BF4]2 (tmeda = N,N,N′,N′-tetramethylethylenediamine) 2d (SCS = {C6H 3-2,6-(CH_2SC_6H_4F-4)_2}) were synthesized by a substitution reaction between the pincer unit [Pd(C _6H_3-2,6-(CH_2SC_6H_4F-4) _2)Cl] 1 and the corresponding bidentate nitrogenated ligands. The topology of the bridging ligand between both pincer units induces the aggregation of the organometallic cations in the solid state. The X-ray diffraction molecular structures of complexes 2a and 2d are also reported.