“…It is important to note that the magnitudes of the shifts of H α and H β paraquat protons observed in case of complexes with naphthalene-containing fluorenocrownophanes 2e-g are the largest among all crownophanes studied by us. [17,19,[21][22][23][24] An interesting fact is that the shift of H 9 protons is almost zero for [2e@6] 2+ complex. It can be caused by two reasons: the structure of this complex has significant differences from the complexes of larger crownophanes, or the shielding effect of paraquat-dication is comparable to one of a naphthalene fragment shielding H 9 protons in a non-complexed crownophane.…”
Section: +mentioning
confidence: 99%
“…bis(hexafluorophosphate) 6•2PF 6 , which is one of the most studied electron-deficient guests in macrocyclic chemistry. [17][18][19][21][22][23][24] This methodology was used for the studies of the crownophanes 2a-g as well.…”
mentioning
confidence: 99%
“…[17][18][19][21][22][23][24] The measurements were made for fixed concentrations of components in a mixture of CD 3 CN-CDCl 3 (4:3). For comparison, spectra of paraquat and the corresponding Fluorenocrownophanes with Naphthalene Fragments fluorenocrownophanes were recorded under the same conditions.…”
“…It is important to note that the magnitudes of the shifts of H α and H β paraquat protons observed in case of complexes with naphthalene-containing fluorenocrownophanes 2e-g are the largest among all crownophanes studied by us. [17,19,[21][22][23][24] An interesting fact is that the shift of H 9 protons is almost zero for [2e@6] 2+ complex. It can be caused by two reasons: the structure of this complex has significant differences from the complexes of larger crownophanes, or the shielding effect of paraquat-dication is comparable to one of a naphthalene fragment shielding H 9 protons in a non-complexed crownophane.…”
Section: +mentioning
confidence: 99%
“…bis(hexafluorophosphate) 6•2PF 6 , which is one of the most studied electron-deficient guests in macrocyclic chemistry. [17][18][19][21][22][23][24] This methodology was used for the studies of the crownophanes 2a-g as well.…”
mentioning
confidence: 99%
“…[17][18][19][21][22][23][24] The measurements were made for fixed concentrations of components in a mixture of CD 3 CN-CDCl 3 (4:3). For comparison, spectra of paraquat and the corresponding Fluorenocrownophanes with Naphthalene Fragments fluorenocrownophanes were recorded under the same conditions.…”
“…Альтернативные способы получения малоприемлемы из-за легкого окисления производных флуорена при синтезе флуоренокраунофанов на их основе. В связи с этим синтез соединений 2а-г осущест-вляли восстановлением соответствующих флуореноно-краунофанов 1а-г [25,26] водородом в присутствии 10% палладия на угле (Схема 1). Контроль степени превра-щения исходных соединений осуществляли методом ТСХ на стеклянных пластинах с закрепленным слоем нейтрального оксида алюминия.…”
“…[7] Присутствие больших ароматических блоков и поляр-ных групп увеличивает устойчивость их комплексов с электронодефицитными органическими субстратами. [8][9][10][11][12][13] Введение гидроксильных групп в молекулу краунофана или криптанда открывает широкие возможности для дальнейших структурных модификаций этих соедине-ний, иммобилизации их на нерастворимые носители и создания полимерных материалов.…”
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