Abstract
A chiral ditopic crown ether functionalized oligo(p-phenylenevinylene), COPV, has been synthesized and fully characterized. The binding properties and the organization of COPV have been studied in soln. and in the solid state. In chloroform, due to the benzo-15-crown-5 moieties, COPV is able to bind cations. In case of K+ a strong 2:2 complex is formed in which two COPVs are sandwiched between two potassium ions. Na+ is bound following a two-step neg. cooperative process to form a 2:1 Na+/COPV complex. When COPV in the presence of potassium ions is drop-cast on a silicon substrate, fibers are formed. In water COPV forms stable helical aggregates as can be concluded from the Cotton effect, the UV-vis and fluorescence spectroscopy. AFM and light scattering studies show that ellipsoidal aggregates are present in water.
Original language | English |
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Pages (from-to) | 2654-2660 |
Journal | Journal of Materials Chemistry |
Volume | 17 |
Issue number | 25 |
DOIs | |
Publication status | Published - 2007 |