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Branched polyphenylenes and phenylene dendrimers:NMR and optical studies (Articolo in rivista)

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Branched polyphenylenes and phenylene dendrimers:NMR and optical studies (Articolo in rivista) (literal)

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Irina A. Khotina , Roberto Consonni, Natalia S. Kushakova , William Porzio , Umberto Giovanella, Alexey I. Kovalev, Marina A. Babushkina, Alexander S. Peregudov, Silvia Destri (2013)
Branched polyphenylenes and phenylene dendrimers:NMR and optical studies
in European Polymer Journal; Elsevier, Oxford (Regno Unito)
(literal)

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Irina A. Khotina , Roberto Consonni, Natalia S. Kushakova , William Porzio , Umberto Giovanella, Alexey I. Kovalev, Marina A. Babushkina, Alexander S. Peregudov, Silvia Destri (literal)

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Irina A. Khotina, Natalia S. Kushakova Alexey I. Kovalev , Marina A. Babushkina , Alexander S. Peregudov -A.N. Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences, Vavilova str. 28, Moscow 119991, Russia Roberto Consonni Umberto Giovanella, William Porzio, Silvia Destri -Istituto per lo Studio delle Macromolecole del Consiglio Nazionale delle Ricerche, Via Bassini, 15, 20133 Milano, Italy (literal)

Titolo

Branched polyphenylenes and phenylene dendrimers:NMR and optical studies (literal)

Abstract

Two branched polyphenylenes with 1,3,5-triphenylbenzene as branching centers were synthesized together with a family of phenylene cyclotrimers as model compounds. On the basis of the NMR analysis, specifically 1H NMR, 13C NMR and 2D heteronuclear correlation experiments (HSQC and HMBC) of model compounds, the huge number of overlapping signals in the polymer spectra are attributed to aromatic protons and carbon atoms of the branched phenylene structure. The comparison with absorption spectra of linear model compounds clearly shows that the polymer optical properties depend on the length of the segments between the branching cores. This result strongly supports the proposed NMR assignment proving that the combination of the two techniques is a powerful tool for unveiling complex branched structures. (literal)

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