Cobalt Bis(1,2-dicarbollide) Ion with a Disulfur Bridge Between B(8) and B(8'). X-Ray Structure, Absolute Configuration of One Enantiomer, and Implications

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Title:Cobalt Bis(1,2-dicarbollide) Ion with a Disulfur Bridge Between B(8) and B(8'). X-Ray Structure, Absolute Configuration of One Enantiomer, and Implications
Creators:
Plešek, Jaromír
Císařová, Ivana
Bačkovský, Jaroslav
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 67, 5, pp. 569-576
Uncontrolled Keywords:Spontaneous resolution of enantiomers, Cobalt bis(dicarbollide) complexes, Metallacarboranes, Absolute configuration, Solid state chirality, X-Ray diffraction, Carboranes, Disulfur bridge

Abstract

The structure and absolute configuration of one enantiomer of the [3-Co-(1,2-C<sub>2</sub>B<sub>9</sub>H<sub>10</sub>)<sub>2</sub>-8,8'-μ-S<sub>2</sub>][NEt<sub>4</sub>] salt was established by X-ray diffraction. A spontaneous resolution took place during crystallization but attempts at resolution in solution <i>via</i> chiral HPLC and chiral capillary electrophoresis failed. The probable cause is discussed and successful resolution of less racemisable 8,8'-bridged metallacarboranes of this type is predicted. The criterion of resolvability ought to be the observation of two C-H<sub>carborane</sub> signals in <sup>1</sup>H NMR of the respective compound with a symmetric bridge. The geometry of the disulfur-bridged title compound is discussed in terms of accessibility of the central ion to external moieties. The central ion is apparently screened from the environment by terminal hydrogens at the rim of the pentagonal ligand planes in any kind of <i>commo</i>-bis-icosahedral sandwich complexes. <p>

Title:Cobalt Bis(1,2-dicarbollide) Ion with a Disulfur Bridge Between B(8) and B(8'). X-Ray Structure, Absolute Configuration of One Enantiomer, and Implications
Creators:
Plešek, Jaromír
Císařová, Ivana
Bačkovský, Jaroslav
Uncontrolled Keywords:Spontaneous resolution of enantiomers, Cobalt bis(dicarbollide) complexes, Metallacarboranes, Absolute configuration, Solid state chirality, X-Ray diffraction, Carboranes, Disulfur bridge
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:67
Number:5
Page Range:pp. 569-576
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc20020569UNSPECIFIED
ID Code:1942
Item Type:Article
Deposited On:06 Feb 2009 17:14
Last Modified:06 Feb 2009 16:14

Citation

Plešek, Jaromír; Císařová, Ivana; Bačkovský, Jaroslav (2002) Cobalt Bis(1,2-dicarbollide) Ion with a Disulfur Bridge Between B(8) and B(8'). X-Ray Structure, Absolute Configuration of One Enantiomer, and Implications. Collection of Czechoslovak Chemical Communications, 67 (5). pp. 569-576. ISSN 0010-0765

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