Imperial College London
Professor Vernon C. Gibson, FRS

Professor Vernon C. Gibson, FRS

Faculty of Engineering, Department of Materials

Visiting Professor
 
 
 
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Contact

 

+44 (0)20 7594 2783v.gibson

 
 
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Location

 

2.27Bessemer BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Nimitsiriwat:2007:10.1039/b706663e,
author = {Nimitsiriwat, N and Gibson, VC and Marshall, EL and White, AJP and Dale, SH and Elsegood, MRJ},
doi = {10.1039/b706663e},
journal = {Dalton Transactions},
title = {Tert-butylamidinate tin(II) complexes: high activity, single-site initiators for the controlled production of polylactide},
url = {http://dx.doi.org/10.1039/b706663e},
year = {2007}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The tin(II) coordination chemistry of two monoanionic N,N-bis(2,6-diisopropylphenyl)alkylamidinate ligands is described. Complexation studies with the acetamidinate, [MeC(NAr)2]–, (Ar = 2,6-iPr2C6H3) are complicated by the side formation of the bis(amidinate) tin(II) compound, [MeC(NAr)2]2Sn, 1. By contrast, the bulkier tert-butylamidinate, [tBuC(NAr)2]–, allows tin(II) mono-halide, -alkoxide and -amide complexes to be isolated cleanly in high yields. Thus, the reaction of [tBuC(NAr)2]H with nBuLi and subsequent treatment with SnCl2 generates [tBuC(NAr)2]SnCl, 2, in ca. 70% yield. Reactions of 2 with LiOiPr, LiNMe2 and LiNTMS2 afford [tBuC(NAr)2]Sn(OiPr), 3, [tBuC(NAr)2]Sn(NMe2), 4, and [tBuC(NAr)2]Sn(NTMS2), 5, respectively. The molecular structures of complexes 1–4 are reported. Complexes 3, 4 and 5 have been investigated as initiators for the ring-opening polymerisation of rac-lactide: 3 and 4 display characteristics of well-controlled polymerisation initiators, but high molecular weight polymer is observed with 5 due to inefficient initiation, a consequence of the steric bulk of the NTMS2 unit. Polymerisations with 3 and 4 are faster than for the corresponding -diketiminate tin(II) complexes, consistent with the more open nature of the tin(II) coordination sphere.
AU  - Nimitsiriwat,N
AU  - Gibson,VC
AU  - Marshall,EL
AU  - White,AJP
AU  - Dale,SH
AU  - Elsegood,MRJ
DO  - 10.1039/b706663e
PY  - 2007///
TI  - Tert-butylamidinate tin(II) complexes: high activity, single-site initiators for the controlled production of polylactide
T2  - Dalton Transactions
UR  - http://dx.doi.org/10.1039/b706663e
UR  - http://www.rsc.org/Publishing/Journals/DT
UR  - http://hdl.handle.net/10044/1/1346
ER  -
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