NMR study of phthalide‐type poly(phenylene)s. Symmetry and additivity |
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| Authors: | Akhnef A Fatykhov Elvira A Sedova Aleksander Е Egorov Sergey N Salazkin Vladimir A Kraikin |
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| Institution: | 1. Ufa Institute of Chemistry, Russian Academy of Sciences, Ufa, Russia;2. A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russia |
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| Abstract: | All 1H and 13C NMR signals of the four poly(phenylenephthalides): polydiphenylenephthalide ( P(DPh)‐1 ), polyterphenylenephthalide ( P(TPh)‐2 ) and two sequentially ordered polymers with different ratios of alternating diphenylenephthalide and terphenylenephthalide units ( P(DTPh)‐3, P(DDTPh)‐4 ) were assigned unequivocally with two‐dimensional NMR techniques (1H–1H COSY and NOESY; 1H–13C HSQC and HMBC). There are four types of polyphenylene fragments: not symmetrical end, symmetrical inner, symmetrical pre‐end and formally symmetric pre‐end. The equivalent carbon atoms in these fragments have different chemical shifts. A full additivity of the chemical shifts for the side phthalide and polyphenylene carbon atoms was revealed. A new structure of diads with a mirror symmetry plane, passing through the middle of aromatic moieties, is proposed. Copyright © 2017 John Wiley & Sons, Ltd. |
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| Keywords: | NMR 1H 13С poly(phenylenephthalide)s diads pre‐end groups additivity |
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