Abstract
In this study, a novel fluorene-bridged benzimidazolium salt (BNM) was successfully synthesized by successive Suzuki coupling reaction and quaternization. BNM was employed to prepare new organometallic polymers of platinum (PMPt) and palladium (PMPd) via ligand-metal coordination. The organimetallic polymers were characterized by GPC, 1H-NMR, FT-IR, elemental analysis, DSC, TGA, optical spectra, and cyclic voltammetry. They exhibited good thermal stability with 5% weight loss temperature above 285℃ in nitrogen atmosphere. Cyclic voltammetric measurement revealed that their LUMO and HOMO energy levels are -2.26 and -2.29 eV and -5.76 and -5.78 eV, respectively. Optical properties of the organometallic polymers were investigated by absorption and photoluminescence (PL) spectra. The PL intensity in solution was enhanced obviously upon increasing the concentration of H+, while the absorption spectra remained almost unchanged. The PL enhancement is probably due to reduced intersystem crossing in the presence of protonic acid. This phenomenon indicates that these organometallic polymers are promosing materials for luminescent pH-sensory applications.
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