Molecular Structure of the Solvated Proton in Isolated Salts. Short, Strong, Low Barrier (SSLB) H-bonds Научная публикация
Журнал |
Journal of the American Chemical Society
ISSN: 0002-7863 , E-ISSN: 1520-5126 |
||||||
---|---|---|---|---|---|---|---|
Вых. Данные | Год: 2002, Том: 124, Номер: 46, Страницы: 13869-13876 Страниц : 8 DOI: 10.1021/ja012671i | ||||||
Ключевые слова | Benzene; Ethers; Hydrogen bonds; Impurities; Molecular structure; Positive ions; Probability density function; Protons; Thermodynamic stability | ||||||
Авторы |
|
||||||
Организации |
|
Информация о финансировании (3)
1 | National Institutes of Health | GM 23851 |
2 | National Science Foundation | CHE-0095206 |
3 | Civilian Research and Development Foundation | RC1-2399-NO-02 |
Реферат:
Large, inert, weakly basic carborane anions of the icosahedral type CHB11R5X6- (R = H, Me; X = Cl, Br) allow ready isolation and structural characterization of discrete salts of the solvated proton, [H(solvent)x][CHB11R5X6], (solvent = common O-atom donor). These oxonium ion Brønsted acids are convenient reagents for the tuned delivery of protons to organic solvents with a specified number of donor solvent molecules and with acidities leveled to those of the chosen donor solvent. They have greater thermal stability than the popular [H(OEt2)2][BArF] acids based on fluorinated tetraphenylborate counterions because carborane anions can sustain much higher levels of acidity. When organic O-atom donors such as diethyl ether, tetrahydrofuran, benzophenone, and nitrobenzene are involved, the coordination number of the proton (x) in [H(solvent)x]+ is two. A mixed species involving the [H(H2O)(diethyl ether)]+ ion has also been isolated. These solid-state structures provide expectations for the predominant molecular structures of solvated protons in solution and take into account that water is an inevitable impurity in organic solvents. The O···O distances are all short, lying within the range from 2.35 to 2.48 Å. They are consistent with strong, linear O···H···O hydrogen bonding. Density functional theory calculations indicate that all H(solvent)2+ cations have low barriers to movement of the proton within an interval along the O···H···O trajectory, i.e., they are examples of so-called SSLB H-bonds (short, strong, low-barrier). Unusually broadened IR bands, diagnostic of SSLB H-bonds, are observed in these H(solvent)2+ cations.
Библиографическая ссылка:
Stasko D.
, Hoffmann S.P.
, Kim K-C.
, Fackler N.L.P.
, Larsen A.S.
, Drovetskaya T.
, Tham F.S.
, Reed C.A.
, Rickard C.E.F.
, Boyd P.D.W.
, Stoyanov E.S.
Molecular Structure of the Solvated Proton in Isolated Salts. Short, Strong, Low Barrier (SSLB) H-bonds
Journal of the American Chemical Society. 2002. V.124. N46. P.13869-13876. DOI: 10.1021/ja012671i WOS Scopus РИНЦ
Molecular Structure of the Solvated Proton in Isolated Salts. Short, Strong, Low Barrier (SSLB) H-bonds
Journal of the American Chemical Society. 2002. V.124. N46. P.13869-13876. DOI: 10.1021/ja012671i WOS Scopus РИНЦ
Файлы:
Полный текст от издателя
Даты:
Поступила в редакцию: | 6 дек. 2001 г. |
Опубликована в печати: | 1 нояб. 2002 г. |
Идентификаторы БД:
Web of science | WOS:000179269800048 |
Scopus | 2-s2.0-0037146045 |
РИНЦ | 13404118 |
Chemical Abstracts | 2002:816728 |
Chemical Abstracts (print) | 138:39317 |
OpenAlex | W2082443721 |