| Abstract
| - A convenient approach to a novel polyfluorene derivative (P1) with hydrogen-bondinginteractions and another derivative P2 without hydrogen-bonding interactions has been developed. Thestructure of polymers P1 and P2 is verified by FT-IR, 1H and 13C NMR, and elemental analysis. Theinvestigation demonstrates that the intramolecular and intermolecular H-bonding interactions play animportant role in the optical properties of P1 in the dilute solution and in films. P1 emits different lightin dilute solutions (blue color) and in solid states (yellowish-orange) under the irradiation of UV light.The time-resolved PL decay dynamics also demonstrate the existence of such interactions in P1. However,this phenomenon is not observed in another polymer (P2) without hydrogen-bonding interactions. Thescanning electron microscopic (SEM) results of P1 at solid states reveal the formation of entanglednanostructures induced though the hydrogen-bonding interactions. Therefore, the investigation showsthat the interaction between the nitrogen and the hydroxy group at the 9-position effectively affects theoptical properties of P1, which might provide a new approach to control over molecular ordering throughinterchain interactions, especially the hydrogen bonding.
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