Τίτλος:
Metathesis Polymerization Reactions Induced by the Bimetallic Complex (Ph4P)2[W2(μ-Br)3Br6]
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
The reactivity of the bimetallic complex (Ph4P)2[W2(μ-Br)3Br6] ({W2.5W}7+, a'2e3) towards ring opening metathesis polymerization (ROMP) of norbornene (NBE) and some of its derivatives, as well as the mechanistically related metathesis polymerization of phenylacetylene (PA), is presented. Our results show that addition of a silver salt (AgBF4) is necessary for the activation of the ditungsten complex. Polymerization of PA proceeds smoothly in tetrahydrofuran (THF) producing polyphenylacetylene (PPA) in high yields. On the other hand, the ROMP of NBE and its derivatives is more efficient in CH2Cl2, providing high yields of polymers. 13C Cross Polarization Magic Angle Spinning (CPMAS) spectra of insoluble polynorbornadiene (PNBD) and polydicyclopentadiene (PDCPD) revealed the operation of two mechanisms (metathetic and radical) for cross-linking, with the metathesis pathway prevailing.
Συγγραφείς:
Despoina Chriti
Alexios Grigoropoulos
Grigorios Raptopoulos
Georgios Charalambidis
Vasilis Nikolaou
Athanassios G. Coutsolelos
Marinos Pitsikalis
Konstantinos Mertis
Patrina Paraskevopoulou
Λέξεις-κλειδιά:
metathesis, ROMP, metal-metal bonds, tungsten
Κύρια θεματική κατηγορία:
Θετικές Επιστήμες
Στοιχεία έργου:
This research has been co-financed by the European Union (European Social Fund—ESF) and Greek national funds through the Operational Program “Education and Lifelong Learning” of the National Strategic Reference Framework (NSRF)—Research Funding Program: THALES. Investing in knowledge society through the European Social Fund. MIS 377252.
