Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2016 May 18;138(19):6234-9.
doi: 10.1021/jacs.6b02422. Epub 2016 May 6.

Initiator Control of Conjugated Polymer Topology in Ring-Opening Alkyne Metathesis Polymerization

Stephen von Kugelgen  1 , Donatela E Bellone  1 , Ryan R Cloke  1 , Wade S Perkins  1 , Felix R Fischer  1   2   3
Affiliations
Free article

Initiator Control of Conjugated Polymer Topology in Ring-Opening Alkyne Metathesis Polymerization

Stephen von Kugelgen et al. J Am Chem Soc. .
Free article

Abstract

Molybdenum carbyne complexes [RC≡Mo(OC(CH3)(CF3)2)3] featuring a mesityl (R = Mes) or an ethyl (R = Et) substituent initiate the living ring-opening alkyne metathesis polymerization of the strained cyclic alkyne, 5,6,11,12-tetradehydrobenzo[a,e][8]annulene, to yield fully conjugated poly(o-phenylene ethynylene). The difference in the steric demand of the polymer end-group (Mes vs Et) transferred during the initiation step determines the topology of the resulting polymer chain. While [MesC≡Mo(OC(CH3)(CF3)2)3] exclusively yields linear poly(o-phenylene ethynylene), polymerization initiated by [EtC≡Mo(OC(CH3)(CF3)2)3] results in cyclic polymers ranging in size from n = 5 to 20 monomer units. Kinetic studies reveal that the propagating species emerging from [EtC≡Mo(OC(CH3)(CF3)2)3] undergoes a highly selective intramolecular backbiting into the butynyl end-group.

PubMed Disclaimer

Publication types