Loading...
|
Please use this identifier to cite or link to this item:
http://ir.ncue.edu.tw/ir/handle/987654321/18919
|
| Title: | Synthesis, Structural Characterization, Computational Study, and Catalytic Activity of Metal Complexes based on Tetradentate Pyridine/N-heterocyclic Carbene Ligand |
| Authors: | Chiu, Pei-Ling;Lai, Chun-Liang;Chang, Chiung-Fang;Hu, Ching-Han;Lee, Hon Man |
| Contributors: | 化學系 |
| Date: | 2005-12
|
| Issue Date: | 2014-08-14T04:29:03Z
|
| Publisher: | American Chemical Society |
| Abstract: | The ligand precursor [LH2]2+·2Br- (1) for the bis(NHC) ligand with N-picolyl moieties is synthesized in 83% yield. Complexation of 1 with palladium and nickel acetates produced [PdL]2+·2Br- (2) and [NiL]2+·2Br- (3), respectively, in quantitative yields. Metathesis reactions of 2 and 3 with AgPF6 give the corresponding bromide-free complexes [PdL]2+·2PF6- (4) and [NiL]2+·2PF6- (5). Complexes 2−4 were characterized by X-ray structural determinations, which reveal a highly twisted helical coordination of L around the metal ions. In solution, however, the tetradentate chelate ring undergoes a rapid fluxional process of ring twisting. A theoretical study confirms that the tetradentate coordination of L in 2 and 3 is energetically more favorable than the bidentate chelation mode with dangling picolyl groups. A preliminary application of [NiL]2+·2Br- in Suzuki coupling of aryl halides with phenylboronic acid shows effective activity. |
| Relation: | Organometallics, 24(25): 6169-6178 |
| Appears in Collections: | [化學系] 期刊論文
|
Files in This Item:
| File |
Size | Format | |
|---|
| index.html | 0Kb | HTML | 577 | View/Open |
|
All items in NCUEIR are protected by copyright, with all rights reserved.
|
