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Crystal structures of the carborane dianions [1,4-(PhCB₁₀H₁₀C)₂C₆H₄]²⁻ and [1,4-(PhCB₁₀H₁₀C)₂C₆F₄]²⁻ and the stabilizing role of the para-phenylene unit on 2n+3 skeletal electron clusters.

Kahlert J, Stammler HG, Neumann B, Harder RA, Weber L, Fox MA - Angew. Chem. Int. Ed. Engl. (2014)

Bottom Line: While carboranes with 2 n+2 and 2 n+4 (n=number of skeletal atoms) skeletal electrons (SE) are widely known, little has been reported on carboranes with odd SE numbers.The salts of the dianions were isolated by reduction with sodium metal and their unusual structures were determined by X-ray crystallography.The diamagnetic dianions contain two 2 n+3 SE clusters where each cluster has a notably long carborane C-carborane C distance of ca 2.4 Å.

View Article: PubMed Central - PubMed

Affiliation: Fakultät für Chemie der Universität Bielefeld, 33615 Bielefeld (Germany).

No MeSH data available.


Diphenyl-ortho-carborane 1 and the two-cluster assemblies 2, 3 and 4.
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sch01: Diphenyl-ortho-carborane 1 and the two-cluster assemblies 2, 3 and 4.

Mentions: Single crystals of the salts ([Na(dme)3]+)2[3]2− and ([Na(dme)3]+)2[4]2− suitable for X-ray crystallography were obtained from DME solutions at low temperatures and measured at 100(2) K (Figure 1).20 In both structures, a crystallographic inversion center is located in the center of the bridging arene ring and the terminal phenyl groups point to opposite sides of the plane defined by the central ring. Table 2 lists important bond lengths of the dianions [3]2− and [4]2− with corresponding bond lengths of the neutral species 3 and 4 included for comparison. Scheme 2 shows the atom numbering used here.


Crystal structures of the carborane dianions [1,4-(PhCB₁₀H₁₀C)₂C₆H₄]²⁻ and [1,4-(PhCB₁₀H₁₀C)₂C₆F₄]²⁻ and the stabilizing role of the para-phenylene unit on 2n+3 skeletal electron clusters.

Kahlert J, Stammler HG, Neumann B, Harder RA, Weber L, Fox MA - Angew. Chem. Int. Ed. Engl. (2014)

Diphenyl-ortho-carborane 1 and the two-cluster assemblies 2, 3 and 4.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4257503&req=5

sch01: Diphenyl-ortho-carborane 1 and the two-cluster assemblies 2, 3 and 4.
Mentions: Single crystals of the salts ([Na(dme)3]+)2[3]2− and ([Na(dme)3]+)2[4]2− suitable for X-ray crystallography were obtained from DME solutions at low temperatures and measured at 100(2) K (Figure 1).20 In both structures, a crystallographic inversion center is located in the center of the bridging arene ring and the terminal phenyl groups point to opposite sides of the plane defined by the central ring. Table 2 lists important bond lengths of the dianions [3]2− and [4]2− with corresponding bond lengths of the neutral species 3 and 4 included for comparison. Scheme 2 shows the atom numbering used here.

Bottom Line: While carboranes with 2 n+2 and 2 n+4 (n=number of skeletal atoms) skeletal electrons (SE) are widely known, little has been reported on carboranes with odd SE numbers.The salts of the dianions were isolated by reduction with sodium metal and their unusual structures were determined by X-ray crystallography.The diamagnetic dianions contain two 2 n+3 SE clusters where each cluster has a notably long carborane C-carborane C distance of ca 2.4 Å.

View Article: PubMed Central - PubMed

Affiliation: Fakultät für Chemie der Universität Bielefeld, 33615 Bielefeld (Germany).

No MeSH data available.