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Octaethylporphyrin and expanded porphyrin complexes containing coordinated BF2 groups
Thomas Köhler1, Michael C Hodgson, Daniel Seidel
1Department of Chemistry and Biochemistry, Univesrity of Texas at Austin, 78712-0165, USA.
Chemical Communications (Cambridge, England)
|April 30, 2004
Summary
Expanded porphyrins amethyrin and [32]octaphyrin form stable boron difluoride (BF2) complexes, unlike octaethylporphyrin. These stable complexes were characterized using X-ray diffraction analysis.
Area of Science:
- * Chemistry
- * Materials Science
- * Supramolecular Chemistry
Background:
- * Octaethylporphyrin forms labile bis-boron difluoride (BF2) complexes.
- * Expanded porphyrins are macrocyclic compounds with unique electronic and structural properties.
Purpose of the Study:
- * To investigate the complexation of hexa- and octapyrrolic expanded porphyrins with boron difluoride.
- * To compare the stability of these complexes with those of octaethylporphyrin.
Main Methods:
- * Treatment of amethyrin and [32]octaphyrin with BF(3).Et(2) under standard conditions.
- * Characterization of the resulting complexes using X-ray diffraction analysis.
Main Results:
- * Stable, non-labile mono- and bis-BF2 complexes were formed from amethyrin and [32]octaphyrin.
- * The stability of these complexes contrasts sharply with the labile bis-BF2 complex of octaethylporphyrin.
- * X-ray diffraction confirmed the structures of the novel BF2 complexes.
Conclusions:
- * Hexa- and octapyrrolic expanded porphyrins yield stable BF2 complexes.
- * These findings expand the scope of porphyrin chemistry and materials science.
- * The enhanced stability of these complexes has implications for their potential applications.