Publication: Synthesis and characterization of guanidinate tin(ii) complexes for ring-opening polymerization of cyclic esters
Issued Date
2020-07-07
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14779234
14779226
14779226
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2-s2.0-85087435171
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Mahidol University
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SCOPUS
Bibliographic Citation
Dalton Transactions. Vol.49, No.25 (2020), 8460-8471
Suggested Citation
Thasanaporn Ungpittagul, Phonpimon Wongmahasirikun, Khamphee Phomphrai Synthesis and characterization of guanidinate tin(ii) complexes for ring-opening polymerization of cyclic esters. Dalton Transactions. Vol.49, No.25 (2020), 8460-8471. doi:10.1039/d0dt01115k Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/57810
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Title
Synthesis and characterization of guanidinate tin(ii) complexes for ring-opening polymerization of cyclic esters
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Abstract
© The Royal Society of Chemistry. Novel homoleptic and heteroleptic (guanidinate)tin(ii) complexes were successfully synthesized and structurally characterized. The first heteroleptic (guanidinato)tin(ii) alkoxide complex was synthesized but found to be unstable leading to the corresponding bis(guanidinate)tin(ii) complex. The catalytic activities of bis(guanidinate)tin(ii) complexes having different substituents at the nitrogen atoms (isopropyl (1), cyclohexyl (2), and p-tolyl (3)) were investigated in the ring-opening polymerization (ROP) of ϵ-caprolactone (ϵ-CL) and lactide (LA). The lone-pair electrons of the tin(ii) atom were proposed to act as an initiator similar to N-heterocyclic carbenes. Among the synthesized catalysts, complex 1 having less steric hindrance efficiently catalyzed both homo- A nd copolymerizations of ϵ-CL and LA giving high molecular weight cyclic polyesters. Transesterification was found to be the major contributor to the cyclization to cyclic polyesters. This journal is