Abstract
Recently, self-assembled functional nano-scale architectures that can respond to external stimulus have been the focus of considerable research. Such architectures hold promise for creating many useful nano machines, such as molecular sensors, molecular motors, and nano-scale information storage systems, by giving function to a surface. One such architecture, a tripodal [2]rotaxane, is known to display repeated folding and unfolding of the shaft in response to changes in its ionic state. It is challenging to describe this folding process theoretically because the system has many stable co-conformations due to the great flexibility of the two chemically independent molecules, an electron-rich crown-ether ring and a shaft containing two different electron-poor viologens along a polyether chain. Using computational modeling we have identified the most stable co-conformations in each charge state. The results show that the folding of the [2]rotaxane is strongly related to the binding site of the crown-ether ring on the shaft. The preferred binding site appears to correlate with the LUMO level rather than the HOMO level. The optimized structure of the [2]rotaxane when attached to a TiO2 surface changes little from its gas phase structure.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 180-185 |
| Number of pages | 6 |
| Journal | Computational and Theoretical Chemistry |
| Volume | 966 |
| Issue number | 1-3 |
| DOIs | |
| State | Published - Jan 1 2011 |
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All Science Journal Classification (ASJC) codes
- Biochemistry
- Condensed Matter Physics
- Physical and Theoretical Chemistry
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Quantum mechanical modeling of a tripodal [2]rotaxane and its binding to TiO2. / Lee, Choongkeun; Maeng, Gloria; Kim, Hae-Won; Sohlberg, Karl.
In: Computational and Theoretical Chemistry, Vol. 966, No. 1-3, 01.01.2011, p. 180-185.Research output: Contribution to journal › Article
TY - JOUR
T1 - Quantum mechanical modeling of a tripodal [2]rotaxane and its binding to TiO2
AU - Lee, Choongkeun
AU - Maeng, Gloria
AU - Kim, Hae-Won
AU - Sohlberg, Karl
PY - 2011/1/1
Y1 - 2011/1/1
N2 - Recently, self-assembled functional nano-scale architectures that can respond to external stimulus have been the focus of considerable research. Such architectures hold promise for creating many useful nano machines, such as molecular sensors, molecular motors, and nano-scale information storage systems, by giving function to a surface. One such architecture, a tripodal [2]rotaxane, is known to display repeated folding and unfolding of the shaft in response to changes in its ionic state. It is challenging to describe this folding process theoretically because the system has many stable co-conformations due to the great flexibility of the two chemically independent molecules, an electron-rich crown-ether ring and a shaft containing two different electron-poor viologens along a polyether chain. Using computational modeling we have identified the most stable co-conformations in each charge state. The results show that the folding of the [2]rotaxane is strongly related to the binding site of the crown-ether ring on the shaft. The preferred binding site appears to correlate with the LUMO level rather than the HOMO level. The optimized structure of the [2]rotaxane when attached to a TiO2 surface changes little from its gas phase structure.
AB - Recently, self-assembled functional nano-scale architectures that can respond to external stimulus have been the focus of considerable research. Such architectures hold promise for creating many useful nano machines, such as molecular sensors, molecular motors, and nano-scale information storage systems, by giving function to a surface. One such architecture, a tripodal [2]rotaxane, is known to display repeated folding and unfolding of the shaft in response to changes in its ionic state. It is challenging to describe this folding process theoretically because the system has many stable co-conformations due to the great flexibility of the two chemically independent molecules, an electron-rich crown-ether ring and a shaft containing two different electron-poor viologens along a polyether chain. Using computational modeling we have identified the most stable co-conformations in each charge state. The results show that the folding of the [2]rotaxane is strongly related to the binding site of the crown-ether ring on the shaft. The preferred binding site appears to correlate with the LUMO level rather than the HOMO level. The optimized structure of the [2]rotaxane when attached to a TiO2 surface changes little from its gas phase structure.
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U2 - 10.1016/j.comptc.2011.02.032
DO - 10.1016/j.comptc.2011.02.032
M3 - Article
VL - 966
SP - 180
EP - 185
JO - Computational and Theoretical Chemistry
JF - Computational and Theoretical Chemistry
SN - 2210-271X
IS - 1-3
ER -