| Title: |
Lanthanide Borohydride Complexes of Bulky Guanidinate Ligands [(Me 3 Si) 2 NC(N‐Cy) 2 ] 2 Ln(μ‐BH 4 ) 2 Li(THF) 2 (Ln = Nd, Sm, Yb): Synthesis, Structure and Catalytic Activity in Lactide Polymerization |
| Authors: |
Skvortsov, Grigorii G.; Yakovenko, Marina V.; Castro, Pascal M.; Fukin, Georgy K.; Cherkasov, Anton V.; Carpentier, Jean‐François; Trifonov, Alexander A. |
| Source: |
European Journal of Inorganic Chemistry ; volume 2007, issue 20, page 3260-3267 ; ISSN 1434-1948 1099-0682 |
| Publisher Information: |
Wiley |
| Publication Year: |
2007 |
| Collection: |
Wiley Online Library (Open Access Articles via Crossref) |
| Description: |
A series of new lanthanide borohydride complexes supported by bulky guanidinate ligands [(Me 3 Si) 2 NC(N‐Cy) 2 ] 2 Ln(μ‐BH 4 ) 2 Li(THF) 2 [Ln = Nd ( 1 ), Sm ( 2 ), Yb ( 3 )] was synthesized by the reaction of related tris(borohydride)s Ln(BH 4 ) 3 (THF) 2 with a twofold molar excess of [(Me 3 Si) 2 NC(N‐Cy) 2 ]Li in toluene at 65 °C. The complexes were isolated after recrystallization from hexane in 66, 64, and 68 % yield, respectively. X‐ray diffraction studies revealed that compounds 1 – 3 are heterodimetallic complexes that have two borohydride ligands μ‐bridging the lanthanide and lithium atoms. Those compounds, especially neodymium complex 1 , act as monoinitiators for the ring‐opening polymerization of racemic lactide, providing atactic polymers with a good degree of control, that is, controlled molecular weights and relatively narrow polydispersities (1.09 < M w / M n < 1.77), provided moderate substrate‐to‐initiator ratios are used. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007) |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1002/ejic.200700123 |
| Availability: |
https://doi.org/10.1002/ejic.200700123; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fejic.200700123; https://onlinelibrary.wiley.com/doi/pdf/10.1002/ejic.200700123; https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ejic.200700123 |
| Rights: |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
| Accession Number: |
edsbas.38BEB170 |
| Database: |
BASE |