Organic light-emitting diodes, organic photovoltaics, field effect transistors or biosensors are the focus of these studies and potential applications. With fast growing awareness of environmental issues, an increasing level of pollution in the natural environment and the search for new reproducible energy sources, the demand for technologies has been shifted to novel intelligent materials. The morphology of the side chains and hydrogen-bonding interactions influenced the sensing capacity of all the studied materials.
Their fluorescent nature was explored for the detection of Cu(II), Fe(III), Co(II), Ag(I), Hg(II), Mg(II), Ca(II), Pb(II) and Zn(II). The Py-grafted LPSQ may be also applied for development of soluble and highly emissive chemosensors. However, due to the differences in the wavelength range of FL emission, only LPSQ-triazole-Py were able to act as energy donors to Nile Red. All the silsesquioxanes studied were found to be able to transfer FL emission energy to Coumarin 6, irrespectively of their spatial structure. The new hybrid materials were tested as fluorescence energy donors to red-emitting dyes (Nile Red and Coumarine 6). Comparative studies with octahedral silsesquioxane (POSS) analogues (POSS-triazole-Py and POSS-amide-Py) emphasized the role of the specific double-strand architecture of the LPSQ backbone and distribution of side Py groups for their photo-luminescent properties. Their optical and physicochemical properties were found to be strongly dependent on the structure of the side chains. The materials are thermally stable and exhibit good thin film forming abilities. Hybrid polymers containing pyrene (Py) units bound to linear poly(silsesquioxane) (LPSQ) chains through flexible linkers containing heteroatoms (S, N, O) (LPSQ-triazole-Py and LPSQ-amide-Py) exhibit intense fluorescence emission, both in very diluted solutions (c = 10 −8 mol/L) and in the solid state.
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