Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



Synthesis and characterization of guanidinate tin(ii) complexes for ring-opening polymerization of cyclic esters

Author affiliations

Abstract

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- and 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.

Graphical abstract: Synthesis and characterization of guanidinate tin(ii) complexes for ring-opening polymerization of cyclic esters

Back to tab navigation

Supplementary files

Article information


Submitted
24 Mar 2020
Accepted
13 Apr 2020
First published
21 Apr 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

Synthesis and characterization of guanidinate tin(II) complexes for ring-opening polymerization of cyclic esters

T. Ungpittagul, P. Wongmahasirikun and K. Phomphrai, Dalton Trans., 2020, Advance Article , DOI: 10.1039/D0DT01115K

Social activity

Search articles by author

Spotlight

Advertisements