Supramolecular alternating block copolymers via metal coordination.
A bimetallic ruthenium olefin metathesis initiator was synthesized and used to polymerize functionalized norbornenes, affording polymers that are living at both polymer chain-ends. Using this bis-ruthenium initiator strategy and combining it with functional chain-terminators, highly-efficient syntheses of either SCS-Pd(II) pincer- or pyridine-functionalized symmetrical telechelic polymers were developed. The terminal functional group incorporation was confirmed by 1H NMR spectroscopy analyses. The telechelic polymers were self-assembled into block copolymers by means of metal coordination between corresponding terminal recognition units. The self-assembly process was monitored by 1H NMR spectroscopy revealing nearly quantitative functionalization. The resulting supramolecular block copolymers were further characterized by viscometry and dynamic light scattering.
Yang
Si Kyung
SK
Department of Chemistry and Molecular Design Institute, New York University, 100 Washington Square East, New York, NY 10003, USA.
Ambade
Ashootosh V
AV
Weck
Marcus
M
D000475:Alkenes / Q000737:chemistry; D002625:Chemistry, Organic / Q000379:methods*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D012428:Ruthenium / Q000737:chemistry*
D000475:Alkenes; D011108:Polymers; D012428:Ruthenium