Zinc complexes supported by imine-benzotriazole phenoxide ligands: Synthesis, characterization, photoluminescent properties and catalysis for CO2/epoxide coupling reaction

• Main Authors: Ting-Yi Chen, 陳庭懿
• Other Authors: Bao-Tsan Ko
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/36888434568381303314

碩士 === 中原大學 === 化學研究所 === 100 === Four imine-benzotriazole phenoxide ligands, C1NOIBTP-H (1); C8NOIBTP-H (2); C1FUIBTP-H (3); C8FUIBTP-H (4) were prepared from the condensation of 3-(2H-benzotriazol-2-yl)-2-hydroxy-5-alkyl-benzaldehyde (alkyl = CH3 and C8H17) with the 2-methoxyethanamine or 1-(2-furyl)methylamine (1.1 equiv) in ether. A series of monomeric tetra-coordinated zinc complexes supported by imine- benzotriazole phenoxide ligands were synthesized and fully characterized. The homoleptic and monomeric complexes [(RIBTP)2Zn] (R = C1NO (A); R = C8NO (B); R = C1FU (C) and R = C8FU (D)) result from treatment of RIBTP-H (2.0 equiv) with ZnEt2, in which the metal center is four-coordinated by two N,O-bidentate RIBTP- ligands. Optical properties and catalysis for epoxide with carbon dioxide coupling reaction of Zn complexes are studied. Luminescent properties of complexes 1-4 in solution were studied, and it was found that maxima emission wavelength (lmax) of 1-4 are in the range 470-480 nm and quantum yield are 20%-24%, depending on the substituents on the imino of their ligands. Interestingly, when complexes coordination different netural co-ligand, 3% of quantum yield would be uncreased. The coupling reaction of CO2 with propylene oxide (PO) catalyzed by air-stable Zn complexes 1-4 in the presence of quaternary ammonium salts (n-Bu4NX) to produce propylene carbonate (PC) was systematic investigated under mild conditions.