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Tantalum chloride species incorporating anionic and cationic guanidine components

Tantalum chloride species incorporating anionic and cationic guanidine components
Tantalum chloride species incorporating anionic and cationic guanidine components

Attempted preparation of tantalum complexes incorporating the anionic guanidinate ligand derived from 1,3,4,6,7,8-hexahydro2H-pyrimido[1,2-a]pyrimidine (hppH) are reported. Reaction of (hpp)SiMe3 and TaCl5 in a 1:1 ratio gave the bis-guanidinate compound rather than the expected mono-ligand species. Reaction of 2 equiv. of (hpp)SiMe3 or in situ generated [hpp]Li with TaCl5 afforded a solid which analysed correctly for the compound (hpp)2TaCl3. X-ray structural analysis of the crystallised product identified the coordination isomer [Ta(hpp)4][TaCl6], with a distorted dodecahedral cation and a regular octahedral anion. During the course of this study, two closely related hydrolysis products, [(hppH2)]2[{TaCl6}{Cl}] and [(hppH2)]3[{TaCl6}2{Cl}] ·MeCN were isolated and structurally characterised, each containing [hppH2]+ cations and [Cl]- and [TaCl6]- anions in extended arrays, linked by intermolecular hydrogen bonds.

Bicyclic guanidinate, Coordination isomer, Dodecahedral geometry, Intermolecular hydrogen bonds, Tantalum
0277-5387
2731-2737
Soria, Delia B.
11f39b44-c185-4154-8ae1-b2deee57dbab
Grundy, Joanna
0bc72187-8dce-41fc-b809-93a6adbe0980
Coles, Martyn P.
4cb5ee08-daf9-4b58-9627-61732e0a818b
Hitchcock, Peter B.
4c0fe381-c3e8-452c-a284-fe14acd3b748
Soria, Delia B.
11f39b44-c185-4154-8ae1-b2deee57dbab
Grundy, Joanna
0bc72187-8dce-41fc-b809-93a6adbe0980
Coles, Martyn P.
4cb5ee08-daf9-4b58-9627-61732e0a818b
Hitchcock, Peter B.
4c0fe381-c3e8-452c-a284-fe14acd3b748

Soria, Delia B., Grundy, Joanna, Coles, Martyn P. and Hitchcock, Peter B. (2003) Tantalum chloride species incorporating anionic and cationic guanidine components. Polyhedron, 22 (19), 2731-2737. (doi:10.1016/S0277-5387(03)00364-4).

Record type: Article

Abstract

Attempted preparation of tantalum complexes incorporating the anionic guanidinate ligand derived from 1,3,4,6,7,8-hexahydro2H-pyrimido[1,2-a]pyrimidine (hppH) are reported. Reaction of (hpp)SiMe3 and TaCl5 in a 1:1 ratio gave the bis-guanidinate compound rather than the expected mono-ligand species. Reaction of 2 equiv. of (hpp)SiMe3 or in situ generated [hpp]Li with TaCl5 afforded a solid which analysed correctly for the compound (hpp)2TaCl3. X-ray structural analysis of the crystallised product identified the coordination isomer [Ta(hpp)4][TaCl6], with a distorted dodecahedral cation and a regular octahedral anion. During the course of this study, two closely related hydrolysis products, [(hppH2)]2[{TaCl6}{Cl}] and [(hppH2)]3[{TaCl6}2{Cl}] ·MeCN were isolated and structurally characterised, each containing [hppH2]+ cations and [Cl]- and [TaCl6]- anions in extended arrays, linked by intermolecular hydrogen bonds.

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More information

Accepted/In Press date: 27 May 2003
e-pub ahead of print date: 15 July 2003
Published date: 15 August 2003
Keywords: Bicyclic guanidinate, Coordination isomer, Dodecahedral geometry, Intermolecular hydrogen bonds, Tantalum

Identifiers

Local EPrints ID: 426194
URI: http://eprints.soton.ac.uk/id/eprint/426194
ISSN: 0277-5387
PURE UUID: d43fe24f-e2d7-42d0-8f2d-c8257759e826

Catalogue record

Date deposited: 16 Nov 2018 17:30
Last modified: 16 Nov 2018 17:30

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