| Title: |
Rare‐Earth Amido and Borohydrido Complexes Supported by Tetradentate Amidinate Ligands: Synthesis, Structure, and Catalytic Activity in Polymerization of Cyclic Esters |
| Authors: |
Skvortsov, Grigorii G.; Shavyrin, Andrei S.; Kovylina, Tatyana A.; Cherkasov, Anton V.; Trifonov, Alexander A. |
| Contributors: |
Russian Foundation for Basic Research |
| Source: |
European Journal of Inorganic Chemistry ; volume 2019, issue 47, page 5008-5017 ; ISSN 1434-1948 1099-0682 |
| Publisher Information: |
Wiley |
| Publication Year: |
2019 |
| Collection: |
Wiley Online Library (Open Access Articles via Crossref) |
| Description: |
Amido [Bu t C(NC 6 H 4 ‐2‐OMe) 2 ] 2 LnN(SiMe 3 ) 2 (Ln = Y ( 3 ), Nd ( 4 )) and borohydrido complexes [Bu t C(NC 6 H 4 ‐2‐OMe) 2 ] 2 LnBH 4 (Ln = Y ( 5 ), Nd ( 6 )) coordinated by new amidinate ligand bearing two pendant anisolyl groups are synthesized. According to X‐ray analysis in complexes 3 and 4 one amidinate ligand is coordinated to the Ln 3+ cation in a bidentate fashion (κ 2 ‐NN), while the second one is tetradentate (κ 4 ‐NNOO). At the same time in borohydrido neodymium complex 6 the amidinate ligands demonstrate κ 4 ‐NNOO and κ 3 ‐NNO coordination modes. Complexes 3 – 6 proved to be efficient initiators for ring‐opening polymerization of rac ‐lactide and allow for achieving quantitative conversion of 500 equivalents of monomer into polymer in 0.3–4.5 h at 25 °C. The polymerization of ε ‐caprolactone initiated by 3 – 6 proceeds much faster under similar conditions. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1002/ejic.201900897 |
| Availability: |
https://doi.org/10.1002/ejic.201900897; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fejic.201900897; https://onlinelibrary.wiley.com/doi/pdf/10.1002/ejic.201900897; https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ejic.201900897 |
| Rights: |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
| Accession Number: |
edsbas.4F8BFDE9 |
| Database: |
BASE |