Improved Cooperativity of Spin-Labile Iron(III) Centers by Self-Assembly in Solution

Improved Cooperativity of Spin-Labile Iron(III) Centers by Self-Assembly in Solution

Supramolecular principles have been applied for improving the spin crossover activity of metal centers due to cooperative effects in solution. Thus, incorporation of alkyloxy tails at the phenyl group of Fe(sal2trien) 2a provides amphiphilic complexes Fe(sal-OR2trien) 2b−d (b, R = C6H13; c, R = C8H1...

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Veröffentlicht in:Journal of the American Chemical Society 2008-11, Vol.130 (44), p.14434-14435
Hauptverfasser: Gandolfi, Claudio, Moitzi, Christian, Schurtenberger, Peter, Morgan, Grace G, Albrecht, Martin
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container_end_page 14435
container_issue 44
container_start_page 14434
container_title Journal of the American Chemical Society
container_volume 130
creator Gandolfi, Claudio
Moitzi, Christian
Schurtenberger, Peter
Morgan, Grace G
Albrecht, Martin
description Supramolecular principles have been applied for improving the spin crossover activity of metal centers due to cooperative effects in solution. Thus, incorporation of alkyloxy tails at the phenyl group of Fe(sal2trien) 2a provides amphiphilic complexes Fe(sal-OR2trien) 2b−d (b, R = C6H13; c, R = C8H17; d, R = C18H37) comprising an apolar group for supramolecular organization and a polar headgroup with potential spin crossover activity due to the presence of a spin-labile iron(III) center. Self-assembly of these complexes in solution resulted in the formation of microsize and submicrosize particles when the alkyl chain was long enough (2d) but not with shorter chains (2a−c). Solutions of 2d showed enhanced spin crossover activity as compared to complexes 2a−c, both in terms of transition temperature and steepness of the transition. This observation has been correlated to an improved cooperativity of the metal centers in 2d due to self-assembly, thus facilitating a tandem spin transition.
doi_str_mv 10.1021/ja806611y
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title Improved Cooperativity of Spin-Labile Iron(III) Centers by Self-Assembly in Solution
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