We present the synthesis and photophysical properties of six. novel N-phenyl-1,3-thiazol-2-ylidene platinum(II) complexes with sterically demanding N-aryl-beta-ketoiminate ligands. Diverse aryl substituents at the coordinating nitrogen atom (phenyl, mesityl, 2,6-diisopropylphenyl, 4-cyanophenyl, 1-naphthyl, and 2,4-difluorophenyl) of the N-aryl-(3Z)-4-amino-3-penten-2-ones exclusively yielded the SP 4-3 coordinated (CC)-C-boolean AND* cyclometalated platinum(II) complexes as single isomers as a consequence of the low steric demand of the (CC)-C-boolean AND* cyclometalating thiazole ligand and the bulkiness of the beta-ketoiminate ligands. The formation of this isomer was confirmed by Pt-195 NMR and extensive 2D NMR experiments, two solid-state structures, and the results of DFT calculations. As a proof of principle, two complexes with the sterically less demanding beta-ketoiminate ligands (3Z)-4-amino-3-penten-2-onato and (2Z)-3-amino-1-phenyl-2-buten-1-onato were synthesized and isolated as an isomeric mixture.
Effect of solvent ratio and counter ions on the morphology of copper nanoparticles and their catalytic application in β-enaminone synthesis
作者:Aravind L. Gajengi、Takehiko Sasaki、Bhalchandra M. Bhanage
DOI:10.1039/c6ra22017g
日期:——
selective copper nanoparticles (NPs) using a microwave irradiation method, using diverse ratios of an ethylene glycol (EG)/water system. The solvent ratio of EG/water plays a pivotal role in the selective formation of CuO NPs. The alteration of the counter ion of the copper precursor leading to the selective synthesis of copper (CuO, Cu2O, Cu(OH)2) NPs has been observed. The synthesized copper NPs are