Coordination behaviour of bis-terdentate N-donor ligands

Double- and single-stranded helicates, mesocates, and cyclic oligomers

N.K. Al-Rasbi, H. Adams, L.P. Harding, M.D. Ward

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Three new ligands have been prepared in which two terdentate chelating pyrazolyl‐bipyridine units are connected by a central aromatic spacer via methylene “hinges”: the spacers are o‐phenylene (LPh), 2,6‐pyridine‐diyl (LPy) and 2,3‐naphthalenediyl (Lnaph). The ligands act as potentially hexadentate bridging ligands, with the central pyridyl N atom of LPy not involved in coordination. The following complexes were prepared and structurally characterised: [M2(LPh)2][ClO4]4 (M = Ni, Cu), which are dinuclear double helicates; [Ag2(LPh)(MeCN)2][BF4]2, a dinuclear complex with an Ag···Ag bond in which the ligand adopts a helical twist around the pair of metal ions; [Ni2(LPy)2][BF4]4, an achiral “mesocate” with a box‐like structure and a face‐to‐face arrangement of ligands; [Ag3(Lnaph)2](BF4)3, which contains a linear trinuclear array of AgI ions with the two ligands arranged in a shallow helical twist, each ligand spanning one terminal and the central metal ion; and [Cd6(Lnaph)6](ClO4)12, a cyclic hexanuclear helicate with a perchlorate anion in the central cavity. Both [Cu2(LPh)2][ClO4]4 and [Cd6(Lnaph)6](ClO4)12, which have architecturally similar bridging ligands, show evidence by electrospray mass spectrometry for formation of a range of cyclic oligomers in solution up to 11‐mers for the CdII/Lnaph system.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
Original languageEnglish
Pages (from-to)4770-4780
Number of pages11
JournalEuropean Journal of Inorganic Chemistry
Issue number30
DOIs
Publication statusPublished - Aug 2007

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Oligomers
Ligands
Metal ions
Hinges
Chelation
Anions
Mass spectrometry
perchlorate
Ions
Atoms

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@article{bb24d65f501a4a04b04f819c1d0a4558,
title = "Coordination behaviour of bis-terdentate N-donor ligands: Double- and single-stranded helicates, mesocates, and cyclic oligomers",
abstract = "Three new ligands have been prepared in which two terdentate chelating pyrazolyl‐bipyridine units are connected by a central aromatic spacer via methylene “hinges”: the spacers are o‐phenylene (LPh), 2,6‐pyridine‐diyl (LPy) and 2,3‐naphthalenediyl (Lnaph). The ligands act as potentially hexadentate bridging ligands, with the central pyridyl N atom of LPy not involved in coordination. The following complexes were prepared and structurally characterised: [M2(LPh)2][ClO4]4 (M = Ni, Cu), which are dinuclear double helicates; [Ag2(LPh)(MeCN)2][BF4]2, a dinuclear complex with an Ag···Ag bond in which the ligand adopts a helical twist around the pair of metal ions; [Ni2(LPy)2][BF4]4, an achiral “mesocate” with a box‐like structure and a face‐to‐face arrangement of ligands; [Ag3(Lnaph)2](BF4)3, which contains a linear trinuclear array of AgI ions with the two ligands arranged in a shallow helical twist, each ligand spanning one terminal and the central metal ion; and [Cd6(Lnaph)6](ClO4)12, a cyclic hexanuclear helicate with a perchlorate anion in the central cavity. Both [Cu2(LPh)2][ClO4]4 and [Cd6(Lnaph)6](ClO4)12, which have architecturally similar bridging ligands, show evidence by electrospray mass spectrometry for formation of a range of cyclic oligomers in solution up to 11‐mers for the CdII/Lnaph system.({\circledC} Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)",
author = "N.K. Al-Rasbi and H. Adams and L.P. Harding and M.D. Ward",
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Coordination behaviour of bis-terdentate N-donor ligands : Double- and single-stranded helicates, mesocates, and cyclic oligomers. / Al-Rasbi, N.K.; Adams, H.; Harding, L.P.; Ward, M.D.

In: European Journal of Inorganic Chemistry, No. 30, 08.2007, p. 4770-4780.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Coordination behaviour of bis-terdentate N-donor ligands

T2 - Double- and single-stranded helicates, mesocates, and cyclic oligomers

AU - Al-Rasbi, N.K.

AU - Adams, H.

AU - Harding, L.P.

AU - Ward, M.D.

N1 - cited By 21

PY - 2007/8

Y1 - 2007/8

N2 - Three new ligands have been prepared in which two terdentate chelating pyrazolyl‐bipyridine units are connected by a central aromatic spacer via methylene “hinges”: the spacers are o‐phenylene (LPh), 2,6‐pyridine‐diyl (LPy) and 2,3‐naphthalenediyl (Lnaph). The ligands act as potentially hexadentate bridging ligands, with the central pyridyl N atom of LPy not involved in coordination. The following complexes were prepared and structurally characterised: [M2(LPh)2][ClO4]4 (M = Ni, Cu), which are dinuclear double helicates; [Ag2(LPh)(MeCN)2][BF4]2, a dinuclear complex with an Ag···Ag bond in which the ligand adopts a helical twist around the pair of metal ions; [Ni2(LPy)2][BF4]4, an achiral “mesocate” with a box‐like structure and a face‐to‐face arrangement of ligands; [Ag3(Lnaph)2](BF4)3, which contains a linear trinuclear array of AgI ions with the two ligands arranged in a shallow helical twist, each ligand spanning one terminal and the central metal ion; and [Cd6(Lnaph)6](ClO4)12, a cyclic hexanuclear helicate with a perchlorate anion in the central cavity. Both [Cu2(LPh)2][ClO4]4 and [Cd6(Lnaph)6](ClO4)12, which have architecturally similar bridging ligands, show evidence by electrospray mass spectrometry for formation of a range of cyclic oligomers in solution up to 11‐mers for the CdII/Lnaph system.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)

AB - Three new ligands have been prepared in which two terdentate chelating pyrazolyl‐bipyridine units are connected by a central aromatic spacer via methylene “hinges”: the spacers are o‐phenylene (LPh), 2,6‐pyridine‐diyl (LPy) and 2,3‐naphthalenediyl (Lnaph). The ligands act as potentially hexadentate bridging ligands, with the central pyridyl N atom of LPy not involved in coordination. The following complexes were prepared and structurally characterised: [M2(LPh)2][ClO4]4 (M = Ni, Cu), which are dinuclear double helicates; [Ag2(LPh)(MeCN)2][BF4]2, a dinuclear complex with an Ag···Ag bond in which the ligand adopts a helical twist around the pair of metal ions; [Ni2(LPy)2][BF4]4, an achiral “mesocate” with a box‐like structure and a face‐to‐face arrangement of ligands; [Ag3(Lnaph)2](BF4)3, which contains a linear trinuclear array of AgI ions with the two ligands arranged in a shallow helical twist, each ligand spanning one terminal and the central metal ion; and [Cd6(Lnaph)6](ClO4)12, a cyclic hexanuclear helicate with a perchlorate anion in the central cavity. Both [Cu2(LPh)2][ClO4]4 and [Cd6(Lnaph)6](ClO4)12, which have architecturally similar bridging ligands, show evidence by electrospray mass spectrometry for formation of a range of cyclic oligomers in solution up to 11‐mers for the CdII/Lnaph system.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)

U2 - 10.1002/ejic.200700715

DO - 10.1002/ejic.200700715

M3 - Article

SP - 4770

EP - 4780

JO - VDI-Berichte

JF - VDI-Berichte

SN - 1434-1948

IS - 30

ER -