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Hexafluorosilicate and tetrafluoroborate coordination to lead(II) di- and tri-imine complexes – unusual fluoroanion coordination modes

Hexafluorosilicate and tetrafluoroborate coordination to lead(II) di- and tri-imine complexes – unusual fluoroanion coordination modes
Hexafluorosilicate and tetrafluoroborate coordination to lead(II) di- and tri-imine complexes – unusual fluoroanion coordination modes
Lead(II) tetrafluoroborate and hexafluorosilicate complexes with 2,2?-bipyridyl, 1,10-phenathroline and 2,2?:6?,2?-terpyridyl have been prepared from the ligand and lead salt in aqueous/MeCN. Crystal structures are reported for [Pb(bipy)2(SiF6)], [Pb(phen)2(SiF6)] and [Pb(bipy)2(BF4)2] which are dinuclear with each lead coordinated “cis” to the two diimines and with the bridging fluoroanions completing eight or nine-coordination. [Pb(phen)2(BF4)2] is eight-coordinate and mononuclear with “cis” diimines and two ?2-BF4? groups. [Pb(phen)2(H2O)2(SiF6)] is also mononuclear with a ?2-SiF62? group and two coordinated water molecules. Reaction of Pb(BF4)2 with 2,2?:6?,2?-terpyridyl gave only [Pb(terpy)3][BF4]2, but Pb(SiF6) produced [Pb(terpy)(H2O)(SiF6)], which is a chain polymer with bridging SiF62? groups and significant ?-stacking of the imine rings. The work has identified a number of coordination modes of the SiF62? anion, which has been little used in coordination chemistry but proves to be versatile and also stable (to decomposition/hydrolysis).
lead(II), hexafluorosilicate, tetrafluoroborate, diimine, triimine
0277-5387
530-536
Burt, Jennifer
4f8a0b68-2fb3-4136-98ff-70dfe1acba98
Grantham, William
7f19e99d-660c-40bb-b161-be9a744c898b
Levason, William
e7f6d7c7-643c-49f5-8b57-0ebbe1bb52cd
Light, Mark E.
cf57314e-6856-491b-a8d2-2dffc452e161
Reid, Gillian
37d35b11-40ce-48c5-a68e-f6ce04cd4037
Burt, Jennifer
4f8a0b68-2fb3-4136-98ff-70dfe1acba98
Grantham, William
7f19e99d-660c-40bb-b161-be9a744c898b
Levason, William
e7f6d7c7-643c-49f5-8b57-0ebbe1bb52cd
Light, Mark E.
cf57314e-6856-491b-a8d2-2dffc452e161
Reid, Gillian
37d35b11-40ce-48c5-a68e-f6ce04cd4037

Burt, Jennifer, Grantham, William, Levason, William, Light, Mark E. and Reid, Gillian (2015) Hexafluorosilicate and tetrafluoroborate coordination to lead(II) di- and tri-imine complexes – unusual fluoroanion coordination modes. Polyhedron, 85, 530-536. (doi:10.1016/j.poly.2014.09.016).

Record type: Article

Abstract

Lead(II) tetrafluoroborate and hexafluorosilicate complexes with 2,2?-bipyridyl, 1,10-phenathroline and 2,2?:6?,2?-terpyridyl have been prepared from the ligand and lead salt in aqueous/MeCN. Crystal structures are reported for [Pb(bipy)2(SiF6)], [Pb(phen)2(SiF6)] and [Pb(bipy)2(BF4)2] which are dinuclear with each lead coordinated “cis” to the two diimines and with the bridging fluoroanions completing eight or nine-coordination. [Pb(phen)2(BF4)2] is eight-coordinate and mononuclear with “cis” diimines and two ?2-BF4? groups. [Pb(phen)2(H2O)2(SiF6)] is also mononuclear with a ?2-SiF62? group and two coordinated water molecules. Reaction of Pb(BF4)2 with 2,2?:6?,2?-terpyridyl gave only [Pb(terpy)3][BF4]2, but Pb(SiF6) produced [Pb(terpy)(H2O)(SiF6)], which is a chain polymer with bridging SiF62? groups and significant ?-stacking of the imine rings. The work has identified a number of coordination modes of the SiF62? anion, which has been little used in coordination chemistry but proves to be versatile and also stable (to decomposition/hydrolysis).

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Accepted/In Press date: 15 September 2014
e-pub ahead of print date: 10 October 2014
Published date: 8 January 2015
Keywords: lead(II), hexafluorosilicate, tetrafluoroborate, diimine, triimine

Identifiers

Local EPrints ID: 385729
URI: https://eprints.soton.ac.uk/id/eprint/385729
ISSN: 0277-5387
PURE UUID: dd7f364b-1356-41cb-860d-8a3714eb4b37
ORCID for William Levason: ORCID iD orcid.org/0000-0003-3540-0971
ORCID for Mark E. Light: ORCID iD orcid.org/0000-0002-0585-0843
ORCID for Gillian Reid: ORCID iD orcid.org/0000-0001-5349-3468

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Date deposited: 21 Jan 2016 14:32
Last modified: 14 Jul 2018 00:37

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