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The transannular interaction in [2.2]paracyclophane: repulsive or attractive?
Konstantin A Lyssenko1, Mikhail Yu Antipin, Dmitry Yu Antonov
1A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991 Moscow, Russian Federation. kostya@xray.ineos.ac.ru
Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|September 10, 2003
Summary
This study reveals [2.2]paracyclophane crystals are ordered, with no direct through-space interaction between aromatic rings. Ethylene bridges and aromatic ring distortion influence inter-ring interactions.
Area of Science:
- Crystallography
- Quantum Chemistry
- Molecular Structure
Background:
- Understanding the electronic interactions within [2.2]paracyclophane is crucial for its applications.
- Previous studies have explored its unique bridged aromatic system.
Purpose of the Study:
- To elucidate the molecular structure and charge density distribution of [2.2]paracyclophane.
- To investigate inter-ring interactions using experimental and computational methods.
Main Methods:
- High-resolution single crystal X-ray diffraction at 100 K.
- Ab initio calculations.
- Topological analysis of electron density and potential-energy density distribution.
Main Results:
- The molecule is ordered in the crystal lattice.
- Analysis confirms no direct through-space interaction between the aromatic rings.
- Ethylene bridges and aromatic ring distortion play a role in modulating inter-ring interactions.
Conclusions:
- The crystal structure and electronic properties of [2.2]paracyclophane were detailed.
- The absence of direct through-space ring interaction was confirmed.
- The influence of structural features on electronic interactions was discussed.