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Salphen-Co(III) complexes catalyzed copolymerization of epoxides with CO2
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SYSNO ASEP 0443098 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Salphen-Co(III) complexes catalyzed copolymerization of epoxides with CO2 Tvůrce(i) Hošťálek, Z. (CZ)
Mundil, R. (CZ)
Císařová, I. (CZ)
Trhlíková, Olga (UMCH-V) RID, ORCID
Grau, E. (FR)
Peruch, F. (FR)
Cramail, H. (FR)
Merna, J. (CZ)Zdroj.dok. Polymer. - : Elsevier - ISSN 0032-3861
Roč. 63, 20 April (2015), s. 52-61Poč.str. 10 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova cobalt salphen catalyst ; CO2 epoxide copolymerization ; MALDI-TOF Vědní obor RIV CD - Makromolekulární chemie Institucionální podpora UMCH-V - RVO:61389013 UT WOS 000353365400008 EID SCOPUS 84925000134 DOI 10.1016/j.polymer.2015.02.018 Anotace The series of novel symmetric and asymmetric salphen cobalt (III) complexes with different counteranions (trichloroacetate, dinitrophenolate, pentafluorobenzoate and acetate) was synthesized and used as catalysts in copolymerization of CO2 with propylene oxide (PO) and cyclohexene oxide (CHO). Hexacoordinated structure of complexes adducts was found in solid phase. The effect of catalyst structure, temperature, CO2 pressure, catalyst/cocatalyst ratio on overall activity and selectivity was investigated. Synthesized salphen-Co (III) complexes were effective for both PO/CO2 and CHO/CO2 highly alternating copolymerization. Substitution of phenylene framework of salphen ligand by chlorine atom led to decrease of activity in PO/CO2 copolymerization. Complexes with trichloroacetate counteranion were shown to be the most active and selective in PO/CO2 copolymerization leading to poly(propylenecarbonate) with highest molar mass. On contrary, catalytic performance of salphen Co (III) complexes in CHO/CO2 copolymerization was almost independent on ligand structure and counteranion. Excellent selectivity to poly(cyclohexenecarbonate) was achieved even at 0.1 MPa CO2. MALDI-TOF analysis of polycarbonates was used to investigate the initiation step of the copolymerization. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2016
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