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Volumn 72, Issue 5, 2007, Pages 1617-1626

Binding studies between triethylene glycol-substituted monopyrrolotetrathiafulvalene derivatives and cyclobis(paraquat-p-phenylene)

Author keywords

[No Author keywords available]

Indexed keywords

ELECTRON DONATING PROPERTIES; MOLECULAR SWITCHES; STABILIZING EFFECT;

EID: 33847617543     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo061962c     Document Type: Article
Times cited : (38)

References (82)
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    • A [2]rotaxane is an interlocked molecule composed of a ring and dumbbell-shaped component between which there are no covalent bonds-only a mechanical and noncovalent bonds are present. The ring encircles the linear portion of the dumbbell-shaped component and is trapped mechanically around it by two bulky stoppers. By contrast, in a [2]pseudorotaxane, at least one of the stoppers on the dumbbell-shaped component is absent with the consequence that dissociation into its two components can occur spontaneously see ref 2b
    • A [2]rotaxane is an interlocked molecule composed of a ring and dumbbell-shaped component between which there are no covalent bonds-only a mechanical and noncovalent bonds are present. The ring encircles the linear portion of the dumbbell-shaped component and is trapped mechanically around it by two bulky stoppers. By contrast, in a [2]pseudorotaxane, at least one of the stoppers on the dumbbell-shaped component is absent with the consequence that dissociation into its two components can occur spontaneously (see ref 2b).
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    • Originally, in a communication (see: Philp, D, Slawin, A. M. Z, Spencer, N, Stoddart, J. F, Williams, D. J. J. Chem. Soc, Chem. Commun. 1991, 1584-1586, a Ka value of 51 M-1 for the 1:1 complex in MeCN at 300 K was reported. Subsequently, it was found that this Ka value was in error. After numerous experiments had been carried out by both the Stoddart group (see ref 7a) and Bryce see ref 7b, a consistent conclusion was reached, that is, that the Ka value is ca. 10000 M-1 in MeCN at 298 K, while in Me2CO at 298 K it is ca. 2600 M-1
    • -1.
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    • 4+. See: Doddi, G.; Ercolani, G.; Mencarelli, P.; Piermattei, A. J. Org. Chem. 2005, 70, 3761-3764.
    • 4+. See: Doddi, G.; Ercolani, G.; Mencarelli, P.; Piermattei, A. J. Org. Chem. 2005, 70, 3761-3764.
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    • Although the existence of other noncovalent interactions, such as [N +⋯O] ion-dipole interactions, taking place between the bipyridinium units of CBPQT4+ and some of the oxygen atoms in the ethylene glycol substituents, can not be ruled out. Previous studies (see: Castro, R, Nixon, K. R, Evanseck, J. D, Kaifer, A. E. J. Org. Chem. 1996, 61, 9591-9595, refs 3e and 15) indicate that the host CBPQT4+ binds a number of different guests through complementary π-π, CT, C-H⋯O, and [C-H⋯π] interactions. In addition, calculations (see ref 16) have shown that ethylene glycol groups are of paramount importance in assisting the complexation process by virtue of their entering into [C-H⋯O] interactions with some of the α-CH hydrogen atoms in the bipyridinium units of CBPQT4, Consequently, π-π, CT, and [C-H⋯O] interactions are probably the most important interactions to be co
    • 4+ complexes.
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    • 3, 300 MHz) at 300 K.
    • 3, 300 MHz) at 300 K.
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    • a where R is the gas constant and T is the absolute temperature.
    • a where R is the gas constant and T is the absolute temperature.
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    • Donor-Acceptor Bond; Gur'yanova, E. N., Gol'dshtein, I. P., Romm, I. P., Eds.; (translated from Russian by R. Kondor, translation edited by D. Slutzkin); Koterpress Enterprises: Jerusalem, Israel, 1975.
    • Donor-Acceptor Bond; Gur'yanova, E. N., Gol'dshtein, I. P., Romm, I. P., Eds.; (translated from Russian by R. Kondor, translation edited by D. Slutzkin); Koterpress Enterprises: Jerusalem, Israel, 1975.
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    • See the Experimental Section for further details
    • See the Experimental Section for further details.
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    • 3N, and finally resuspended in the desired eluent.
    • 3N, and finally resuspended in the desired eluent.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.