Affiliation:
1. College of Chemistry and Chemical Engineering, Heilongjiang Province Key Laboratory of Polymeric Composition, Qiqihar University , Wenhua Street 42 , Qiqihar , 161006 , China
Abstract
Abstract
Three novel rhodium complexes, with l-tyrosine (l-Tyr), l-arginine (l-Arg), or 2,4-diamino-6-phenyl-1,3,5-triazine (Dpt) as a ligand, named as [Rh(cod)(l-Tyr)], [Rh(cod)(l-Arg)], and [Rh(cod)(Dpt)2], respectively, had been synthesized for catalyzing the polymerization of phenylacetylene. Their yields were 62.34, 54.87, and 58.21%, respectively, by the most suitable synthesis conditions at 25°C for 4 h. The structures and purity of these complexes were proved by 1H NMR, element analysis, and scanning electron microscope (SEM). It has been examined that phenylacetylene could be polymerized by the three complexes as catalysts with high degrees of polymerization (n = 368, 385, and 664, respectively) and yields (about 87.62, 88.39, and 59.67%, respectively). In conclusion, compared with traditional [Rh–N] type catalysts, the novel [N–Rh–N] type catalyst ([Rh(cod)(Dpt)2]) gained better catalytic performance. By comparing the yield, Mw, and degree of their polymerization, the polymerization mechanism was found under the [N–Rh–N] type rhodium catalyst system.
Reference18 articles.
1. Sanchez A, Fang MF, Ahmed A, Sanchez-Delgado RA. Hydrogenation of arenes, N-heteroaromatic compounds, and alkenes catalyzed by rhodium nanoparticles supported on magnesium oxide. Appl Catal A: Gen. 2014;447:117–24.
2. Mimoun H, Machirant M, Roch IS. Activation of molecular oxygen: Rhodium-catalyzed oxidation of olefins. J Am Chem Soc. 1978;100:5437–44.
3. Yang J. Rhodium phosphine complex catalyzed hydroformylation of FCC light gasoline olefins. Qingdao: China University of Petroleum; 2018. p. 2–50.
4. Zhao XY, Jia HG, Song HM. Oxidation coupling of benzylene with 2,4-hydroxybenzaldehyde over rhodium catalyst with Amino acid as ligand. Chem Res. 2020;31:32–4.
5. Ke ZF, Abe S, Ueno T, Morokuma K. Rh-catalyzed polymerization of phenylacetylene: theoretical studies of the reaction mechanism, regioselectivity, and stereoregularity. J Am Chem Soc. 2011;133:7926–41.