Geometry Constrained N-(5,6,7-Trihydroquinolin-8-ylidene)arylaminopalladium Dichloride Complexes: Catalytic Behavior toward Methyl Acrylate (MA), Methyl Acrylate-co-Norbornene (MA-co-NB) Polymerization and Heck Coupling

• Published in: Molecules (Basel, Switzerland) Vol. 21; no. 12; p. 1686
• Main Authors: Zeng, Yanning, Mahmood, Qaiser, Liang, Tongling, Sun, Wen-Hua
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 07.12.2016; MDPI
• Subjects: Acrylates - chemistry; Catalysis; constrained ligand framework; Crystallography, X-Ray; Geometry; Heck coupling; homopolymerization of MA; Ligands; MA/NB copolymerization; Models, Molecular; Molecular Structure; Molecular weight; Norbornanes - chemistry; Oxidation; Palladium; Palladium - chemistry; palladium complexes; Polymerization; Polymers - chemistry; Stereoisomerism; X-Ray Diffraction; Beijing China; China; MA/NB copolymerization; constrained ligand framework; palladium complexes; homopolymerization of MA; Heck coupling
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules21121686

A new pair of plladium complexes ( and ) ligated with constrained -(5,6,7-trihydroquinolin-8-ylidene)arylamine ligands have been prepared and well characterized by ¹H-, C-NMR and FTIR spectroscopies as well as elemental analysis. The molecular structure of and in solid state have also been determined by X-ray diffraction, showing slightly distorted square planar geometry around the palladium metal center. All complexes - are revealed highly efficient catalyst in methyl acrylate (MA) polymerization as well as methyl acrylate/norbornene (MA/NB) copolymerization. In the case of MA polymerization, as high as 98.4% conversion with high molecular weight up to 6282 kg·mol was achieved. Likewise, complex has good capability to incorporate about 18% NB content into MA polymer chains. Furthermore, low catalyst loadings (0.002 mol %) of or are able to efficiently mediate the coupling of haloarenes with styrene affording up to 98% conversion.