Controllable supramolecular assembly by π-π interactions: Cobalt(II) and copper(II) complexes with benzimidazole derivatives
Organometallics, ISSN: 0276-7333, Vol: 21, Issue: 21, Page: 4350-4355
2002
- 42Citations
- 14Captures
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Article Description
Two novel helical supramolecular architectures were constructed by self-assembly of cobalt(II) (1) and copper(II) complexes (2) of 1-[(5-methyl-2-furyl)methylene]-2-(5-methyl-2-furyl)benzimidazole in the crystalline form, which were stabilized through the intra- and intermolecular π-π interactions between benzimidazole rings. When the methylfuran fragment of the ligand was switched to a furan group, the cobalt complex (3) of 1-(2-furylmethylene)-2-(2-furyl)benzimidazole formed another type of supramolecular network through π-π interactions under similar reaction conditions. The spectral and thermal behaviors of complexes 1-3 were investigated by ultraviolet, chiral dichroism, and fluorescence spectral and thermogravimetric techniques. When MAO was used as the cocatalyst, complex 1 displayed satisfactory activity for ethylene oligomerization up to 2.5 × 10 g of CH mol h at room temperature and 9 atm of ethylene.
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