Chromotropic ferrocenyl chalcone with two pyrenyl groups: Solvatochromism and molecular chemosensor for Fe(III)/Fe(II) ions |
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Authors: | Su-Kyung Lee Yeon-Seo Noh Kyung-In Son Dong-Youn Noh |
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Affiliation: | 1. Department of Chemistry, Seoul Women''s University, Seoul 139-774, Republic of Korea;2. Eunkwang Girls High School, Seoul 135-271, Republic of Korea |
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Abstract: | A chromotropic ferrocenyl chalcone with two pyrenyl groups (Fc-dPyr) is prepared and spectroscopically characterized. The X-ray structure analysis shows that the two pyrenyl groups are almost parallel to each other with a torsion angle of 5.57° and adopt a dimeric mode with a distance of 3.776 Å between them, ready to form an excimer. The solvatochromic fluorescence spectra indicate that the emission maxima observed in hydrogen-bonding donor (HBD) solvents (CHCl3, EtOH and MeOH) exhibit a strictly linear relationship with the normalized ETN value, while those in a non-HBD solvent (CH3CN) do not. The molecular chemosensor activity of Fc-dPyr is highly selective toward Fe(III) ions over Fe(II) ions. The fluorescence emission intensity of Fc-dPyr steeply decreases in the presence of Fe(III) ions as an oxidant, but not in the presence of Fe(II) ions. |
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