Synthesis and crystal structures of some cobalt halide derivatives containing alkyl or silanolato groups

Ashrafolmolouk Asadi; Colin Eaborn; Michael S. Hill; Peter B. Hitchcock; J. David Smith

doi:10.1016/j.jorganchem.2004.10.043

Synthesis and crystal structures of some cobalt halide derivatives containing alkyl or silanolato groups

Ashrafolmolouk Asadi, Colin Eaborn, Michael S. Hill, Peter B. Hitchcock, J. David Smith

Research output: Contribution to journal › Article › peer-review

14 Citations (SciVal)

Abstract

The alkylcobalt halide [{(2-C₅H₄N)Me ₂Si}(Me₃Si)₂CCoCl]₂ (2) and the lithium silanolatocobaltates Li(THF)₂(μ-Br)₂Co(μ- OSiMe₃)₂Co(μ-Br)₂Li(THF)₂ (4) and [LiBr{Li(THF)}₂{CoBr(OSiMe₃)₃}]₂ (5) form centrosymmetrical halogen-bridged dimers in the crystalline state. Compound 4 shows bromide bridges between lithium and cobalt, and silanolato bridges between the cobalt atoms. Below 200 K there are significant antiferromagnetic interactions between the cobalt centres. Compound 5 crystallises in a novel structure in which two cubane-like fragments containing silanolato bridges are linked together through a Li₂Br₂ ring.

Original language	English
Pages (from-to)	944-951
Number of pages	8
Journal	Journal of Organometallic Chemistry
Volume	690
Issue number	4
DOIs	https://doi.org/10.1016/j.jorganchem.2004.10.043
Publication status	Published - 14 Feb 2005

Funding

We thank the Engineering and Physical Sciences Research Council for financial support, the Royal Society for the award of funds to A.A. for a Developing World Study Visit, and Professor K. Prassides for help with magnetic measurements.

Keywords

Clusters
Cobalt halides
Magnetic measurements
Organosilicon
Silanolato derivatives

ASJC Scopus subject areas

Biochemistry
Physical and Theoretical Chemistry
Organic Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/j.jorganchem.2004.10.043

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title = "Synthesis and crystal structures of some cobalt halide derivatives containing alkyl or silanolato groups",

abstract = "The alkylcobalt halide [\{(2-C5H4N)Me 2Si\}(Me3Si)2CCoCl]2 (2) and the lithium silanolatocobaltates Li(THF)2(μ-Br)2Co(μ- OSiMe3)2Co(μ-Br)2Li(THF)2 (4) and [LiBr\{Li(THF)\}2\{CoBr(OSiMe3)3\}]2 (5) form centrosymmetrical halogen-bridged dimers in the crystalline state. Compound 4 shows bromide bridges between lithium and cobalt, and silanolato bridges between the cobalt atoms. Below 200 K there are significant antiferromagnetic interactions between the cobalt centres. Compound 5 crystallises in a novel structure in which two cubane-like fragments containing silanolato bridges are linked together through a Li2Br2 ring.",

keywords = "Clusters, Cobalt halides, Magnetic measurements, Organosilicon, Silanolato derivatives",

author = "Ashrafolmolouk Asadi and Colin Eaborn and Hill, \{Michael S.\} and Hitchcock, \{Peter B.\} and Smith, \{J. David\}",

year = "2005",

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doi = "10.1016/j.jorganchem.2004.10.043",

language = "English",

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journal = "Journal of Organometallic Chemistry",

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TY - JOUR

T1 - Synthesis and crystal structures of some cobalt halide derivatives containing alkyl or silanolato groups

AU - Asadi, Ashrafolmolouk

AU - Eaborn, Colin

AU - Hill, Michael S.

AU - Hitchcock, Peter B.

AU - Smith, J. David

PY - 2005/2/14

Y1 - 2005/2/14

N2 - The alkylcobalt halide [{(2-C5H4N)Me 2Si}(Me3Si)2CCoCl]2 (2) and the lithium silanolatocobaltates Li(THF)2(μ-Br)2Co(μ- OSiMe3)2Co(μ-Br)2Li(THF)2 (4) and [LiBr{Li(THF)}2{CoBr(OSiMe3)3}]2 (5) form centrosymmetrical halogen-bridged dimers in the crystalline state. Compound 4 shows bromide bridges between lithium and cobalt, and silanolato bridges between the cobalt atoms. Below 200 K there are significant antiferromagnetic interactions between the cobalt centres. Compound 5 crystallises in a novel structure in which two cubane-like fragments containing silanolato bridges are linked together through a Li2Br2 ring.

AB - The alkylcobalt halide [{(2-C5H4N)Me 2Si}(Me3Si)2CCoCl]2 (2) and the lithium silanolatocobaltates Li(THF)2(μ-Br)2Co(μ- OSiMe3)2Co(μ-Br)2Li(THF)2 (4) and [LiBr{Li(THF)}2{CoBr(OSiMe3)3}]2 (5) form centrosymmetrical halogen-bridged dimers in the crystalline state. Compound 4 shows bromide bridges between lithium and cobalt, and silanolato bridges between the cobalt atoms. Below 200 K there are significant antiferromagnetic interactions between the cobalt centres. Compound 5 crystallises in a novel structure in which two cubane-like fragments containing silanolato bridges are linked together through a Li2Br2 ring.

KW - Clusters

KW - Cobalt halides

KW - Magnetic measurements

KW - Organosilicon

KW - Silanolato derivatives

UR - https://www.scopus.com/pages/publications/13444301198

U2 - 10.1016/j.jorganchem.2004.10.043

DO - 10.1016/j.jorganchem.2004.10.043

M3 - Article

AN - SCOPUS:13444301198

SN - 0022-328X

VL - 690

SP - 944

EP - 951

JO - Journal of Organometallic Chemistry

JF - Journal of Organometallic Chemistry

IS - 4

ER -

Synthesis and crystal structures of some cobalt halide derivatives containing alkyl or silanolato groups

Abstract

Funding

Keywords

ASJC Scopus subject areas

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