Spectroscopic study in the UV-Vis, near and mid IR of cationic species formed by interaction of thiophene, dithiophene and terthiophene with the zeolite H-Y

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DOI 10.1039/A807353H
Impact Factor 3.676
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Abstract

The vibrational (in the mid-IR and near-IR) and the UV-Vis spectra of products formed upon interaction of thiophene with H-Y, show the initial formation of neutral hydrogen bonded adducts. In the presence of thiophene excess, protonation slowly occurs with formation of C4H5S+ followed by oligomerization leading to C8H7S2+, C12H9S3+ and more complex species. This conclusion is fully confirmed by the study of the direct interaction of H-Y with dithiophene and terthiophene, where protonated C8H7S2+ and C12H9S3+ are produced in the initial interaction stages. The ascertained occurrence of intramolecular and intermolecular hydrogen transfer points towards a network of complex reactions leading to the final formation of some families of similar isomers. Some of the protonated (oligomeric) species interact via strong hydrogen bonds with the unreacted Brønsted groups of H-Y. The positively charged species can easily react with NH3 with the formation of NH4+ and neutral species. At room temperature the process is partially reversible.

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DOI: 10.1039/AN8780300362

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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