Two N-pyrene based ligands L1 (1-pyrene-CH=N(CH 2 ) 2 -SPh) and L2 (1-pyrene-CH=N(CH 2 ) 2 -SePh) with an imine functionality and a chalcogen donor have been synthesized and characterized using 1 H as well as 13 C NMR spectral techniques. Palladium(II) complexes (1; PdCl 2 À ĸ 2 À L1 and 2; PdCl 2 À ĸ 2 À L2) of L1 and L2 have been prepared, isolated and characterized using NMR and single crystal X-ray diffraction studies. The geometry around Pd is nearly square planar in these complexes and ligands are coordinated to the metal centre in a bidentate (S/ Se, N) mode. The molecular complexes 1 and 2 have been explored as potential catalysts in O À arylation reaction between substituted aryl halides and phenol. Both the complexes showed excellent efficiency towards this coupling and a TON of 990 (maximum TOF 310) has been achieved using 0.1 mol% of catalyst 2. The effect of the nature of chalcogen donor atom (S/Se) on catalytic efficiency of the complexes has been observed as selenium congener was more efficient than sulphur counterpart.
Monodispersed ultrasmall Pd nanoparticles synthesized utilizing bulky organochalcogen secondary amines as stabilizers and application in Suzuki coupling of aryl chlorides at low catalyst loading.
A variety of organoselenium compounds (containing Se donor site) have been used as ligand scaffolds for developing transition metal catalytic systems during the last two decades. Such compounds are known...
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