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New Lanthanide Complexes for the Polymerization of αmethylene-γ-butyrolactone to Obtain Biodegradable CrossLinkable Unsaturated Polyesters

Undergraduate #167
Discipline: Chemistry and Chemical Sciences
Subcategory: Materials Science

Zakiya Barnes - Savannah State University
Co-Author(s): Rasaan Ford and DeChristian Guthrie



Polyesters are commonly applied in bio-medical engineering for drug delivery devices and tissue engineering products because of their biodegradable and biocompatible properties. Cyclic esters containing cross-linkable olefinic pendant arms will be employed for the first time as monomers for cross-linked biodegradable polyesters using new heteroleptic lanthanide complexes (LLnX). The new heteroleptic lanthanide complexes [L^B2 LaN〖{(Si〖(CH_3)〗_3)〗_2] (1) and [L^B2 NdN〖(Si〖(CH_3)〗_3)〗_2] (2) were synthesized from acid-base ligand exchange reactions between chiral ligand H_2 L^B2 and corresponding homoleptic lanthanide compound (La〖[N〖{(Si (CH_3 )_3 }_2)]〗_3〗_ or Nd〖[N〖{(Si(CH_3 )_3}〗_2]〗_3 respectively) at -40◦C in toluene. Compounds 1 and 2 were subsequently reacted with excess isopropanol to obtain, – [L^B2〖LaO〗^i Pr] (3) and [L^B2〖NdO〗^i Pr] (4). The new LLnX complexes will then be used as catalyst for the ring opening polymerization of MBL (α-methylene-γ-butyrolactone).

Funder Acknowledgement(s): Department of Defense - Army Research Offices

Faculty Advisor: Pascal Binda,

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This material is based upon work supported by the National Science Foundation (NSF) under Grant No. DUE-1930047. Any opinions, findings, interpretations, conclusions or recommendations expressed in this material are those of its authors and do not represent the views of the AAAS Board of Directors, the Council of AAAS, AAAS’ membership or the National Science Foundation.

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