Binuclear magnesium, calcium and zinc complexes based on bis(salicylaldimine) ligands with rigid bridges
Range S, Piesik DFJ, Harder S (2008)
Publication Type: Journal article, Original article
Publication year: 2008
Journal
Original Authors: Range S., Piesik D.F.-J., Harder S.
Publisher: Wiley-VCH Verlag
Pages Range: 3442-3451
Journal Issue: 22
Abstract
Four dinucleating ligands based on sterically protected salicylaldimine units bridged by a variety of rigid groups have been prepared: 1,4-bis[(3,5-di-tert-butylsalicylidene)amino]-benzene (PARA-H), 1,3-bis[(3,5-di-tert-butylsalicylidene)-amino]benzene (META-H), 2,6-bis[(3,5-di-tert-butylsalicylidene) amino]pyridine (PYR-H) and 1,4-bis[(3,5-di-tert-butylsalicylidene) amino]-2,3,5,6-tetramethylbenzene (MePARA-H). Reactions with [(MeSi) N]Mg·(thf) gave three new heteroleptic dinuclear magnesium complexes: PARA-[MgN(SiMe) ·thf], META-[MgN(SiMe) ·thf] and PYR-[MgN(SiMe) ·thf]. The complex PARA-[MgN(SiMe )·thf] was characterized by X-ray diffraction. Reactions with [(MeSi)N] Ca·(thf) gave mixtures of homoleptic and heteroleptic species. The homoleptic and heteroleptic calcium complexes [PARA-Ca·(thf)] and PARA-[CaN(SiMe )· (thf)] could be isolated and were structurally characterized. These complexes are not stable in solution. Attempted syntheses of MePARA-[CaN(SiMe) ·(thf)] gave insoluble coordination polymers of MePARA-Ca. Reactions with [(MeSi) N]Zn gave precipitates of homoleptic dinuclear zinc complexes of which PYR-Zn could be structurally characterized as a cyclic tetramer. The dinuclear magnesium complexes PARA-[MgN(SiMe) ·thf], META-[MgN(SiMe) ·thf] and PYR-[MgN(SiMe) ·thf] are neither active in the polymerization of epoxides nor in the copolymerization of epoxide/CO (cylohexene or propylene oxide) but initiate the polymerization of rac-lactide. Yields of isolated polylactide strongly depend on the bridging unit and the solvent. © Wiley-VCH Verlag GmbH & Co. KGaA, 2008.
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APA:
Range, S., Piesik, D.F.-J., & Harder, S. (2008). Binuclear magnesium, calcium and zinc complexes based on bis(salicylaldimine) ligands with rigid bridges. European Journal of Inorganic Chemistry, 22, 3442-3451. https://doi.org/10.1002/ejic.200800308
MLA:
Range, Sven, Dirk F. -J. Piesik, and Sjoerd Harder. "Binuclear magnesium, calcium and zinc complexes based on bis(salicylaldimine) ligands with rigid bridges." European Journal of Inorganic Chemistry 22 (2008): 3442-3451.
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