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Titanium(IV) and zirconium(IV) amido complexes derived from the azaoxa macrocycle 3,3-dimethyl-1,5-diaza-8-oxacyclodecane

Titanium(IV) and zirconium(IV) amido complexes derived from the azaoxa macrocycle 3,3-dimethyl-1,5-diaza-8-oxacyclodecane
Titanium(IV) and zirconium(IV) amido complexes derived from the azaoxa macrocycle 3,3-dimethyl-1,5-diaza-8-oxacyclodecane
The novel tridentate azaoxa macrocycle [O(NH)(2)], 3,3-dimethyl-1,5-diaza-8-oxacyclodecane, can be singly or doubly lithiated with (BuLi)-Bu-n at the secondary amine N atoms, giving [O(NH)N]Li and [O(N)(2)]Li-2, respectively, and further elaborated with introduction of TMS substituents via reaction with (TMS) Cl. Aminolysis of [Ti(NMe2)(2)Cl-2] or [Zr(NR2)(2)Cl-2(THF)(2)] with [O(NH)(2)] in toluene gave the distorted octahedral M[O(NH) N](NR2) Cl-2 (M) Ti, R) Me; M) Zr, R) Me or Et), in which the macrocycle functions as a monoanionic ligand via an amido, an amine, and an ether functionality. Salt metathesis of [Zr(NEt2)(2)Cl-2(THF)(2)] with [O(NH)N] Li in toluene afforded Zr[(O(NH) N)](NEt2)(2)Cl, the structure of which also confirms tridentate macrocycle coordination via one amido, one amine, and one ether group; in contrast, analogous salt metathesis involving [Zr(NEt2)(2)Cl-2(THF)(2)] and [O(N)(2)Li-2] gave the "sandwich" complex [(ON2)(2)Zr], with the macrocycle behaving as a dianionic ligand (Porter, R. M.; et al. Dalton Trans. 2005, 427). Finally, treatment of [O(NH)(2)] with AlMe3 gave the simple donor-acceptor adduct [O(NH)(2)]AlMe3, which resisted alkanolysis by prolonged heating. In the presence of MAO the new zirconium, titanium, and aluminum complexes show low activity in the polymerization of ethylene.
transition-metals, alkyl complexes, ligands, chemistry, reactivity, lithium
0020-1669
6516-6522
Porter, Robin M.
0f562df9-d217-4c62-a3c5-66b67262dcfb
Danopoulos, Andreas A.
4919c13e-ebe4-4456-b329-c806c8e22236
Reid, Gillian
37d35b11-40ce-48c5-a68e-f6ce04cd4037
Porter, Robin M.
0f562df9-d217-4c62-a3c5-66b67262dcfb
Danopoulos, Andreas A.
4919c13e-ebe4-4456-b329-c806c8e22236
Reid, Gillian
37d35b11-40ce-48c5-a68e-f6ce04cd4037

Porter, Robin M., Danopoulos, Andreas A. and Reid, Gillian (2006) Titanium(IV) and zirconium(IV) amido complexes derived from the azaoxa macrocycle 3,3-dimethyl-1,5-diaza-8-oxacyclodecane. Inorganic Chemistry, 45 (16), 6516-6522. (doi:10.1021/ic060302n).

Record type: Article

Abstract

The novel tridentate azaoxa macrocycle [O(NH)(2)], 3,3-dimethyl-1,5-diaza-8-oxacyclodecane, can be singly or doubly lithiated with (BuLi)-Bu-n at the secondary amine N atoms, giving [O(NH)N]Li and [O(N)(2)]Li-2, respectively, and further elaborated with introduction of TMS substituents via reaction with (TMS) Cl. Aminolysis of [Ti(NMe2)(2)Cl-2] or [Zr(NR2)(2)Cl-2(THF)(2)] with [O(NH)(2)] in toluene gave the distorted octahedral M[O(NH) N](NR2) Cl-2 (M) Ti, R) Me; M) Zr, R) Me or Et), in which the macrocycle functions as a monoanionic ligand via an amido, an amine, and an ether functionality. Salt metathesis of [Zr(NEt2)(2)Cl-2(THF)(2)] with [O(NH)N] Li in toluene afforded Zr[(O(NH) N)](NEt2)(2)Cl, the structure of which also confirms tridentate macrocycle coordination via one amido, one amine, and one ether group; in contrast, analogous salt metathesis involving [Zr(NEt2)(2)Cl-2(THF)(2)] and [O(N)(2)Li-2] gave the "sandwich" complex [(ON2)(2)Zr], with the macrocycle behaving as a dianionic ligand (Porter, R. M.; et al. Dalton Trans. 2005, 427). Finally, treatment of [O(NH)(2)] with AlMe3 gave the simple donor-acceptor adduct [O(NH)(2)]AlMe3, which resisted alkanolysis by prolonged heating. In the presence of MAO the new zirconium, titanium, and aluminum complexes show low activity in the polymerization of ethylene.

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More information

Published date: 2006
Keywords: transition-metals, alkyl complexes, ligands, chemistry, reactivity, lithium

Identifiers

Local EPrints ID: 44526
URI: http://eprints.soton.ac.uk/id/eprint/44526
ISSN: 0020-1669
PURE UUID: ae54408d-825d-4886-a84f-f6c32d6cfa60
ORCID for Gillian Reid: ORCID iD orcid.org/0000-0001-5349-3468

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Date deposited: 05 Mar 2007
Last modified: 07 Aug 2019 00:52

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