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Design, synthesis and coordination chemistry of sidearm substituted bisoxazoline ligands

TitleDesign, synthesis and coordination chemistry of sidearm substituted bisoxazoline ligands
Publication TypeJournal Article
Year of Publication2009
AuthorsBichler, P, Sun, AD, Patrick, BO, Love, JA
JournalINORGANICA CHIMICA ACTA
Volume362
Pagination4546-4552
Date PublishedSEP 15
ISSN0020-1693
Abstract

We describe herein the design, synthesis and coordination chemistry of a novel ligand motif that combines a bisoxazoline with a third flexible chelating substituent ({''}tail{''}). Four such ligands (6-9) were synthesized from phenylglycine in 4-5 steps each in ca. 20% overall yield. Coordination of 6 and 7 to {[}Re(CO)(4)Cl](2) yielded crystals suitable for X-ray analysis. Likewise, crystals were obtained from coordination of 6 to FeCl(2). The solid state structures of the resulting complexes (10-12) reveal kappa(2) binding of the bisoxazoline motif; however, the structures of complexes 10 and 12 show that the ``tail{''} is poised above the metal center, demonstrating the potential for alternate binding modes in solution. The complexes exhibit a relatively planar 6-membered chelate structure, in contrast to the boat conformation typical of trispyrazolylborate complexes. (C) 2009 Elsevier B. V. All rights reserved.

DOI10.1016/j.ica.2009.04.039