期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 53, 期 36, 页码 9476-9481出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201403816
关键词
cyclophane; excimer emission; mixed-valence compounds; radical anion dimer; pi-electron delocalization
资金
- Joint Center of Excellence in Integrated Nano-Systems (JCIN) at King Abdul-Aziz City for Science and Technology (KACST) [32-949]
- Northwestern University (NU)
- KACST
- NU
- Chemical Sciences, Geosciences, and Biosciences Division, Office of Basic Energy, DOE [DEFG02-99ER-14999]
- International Institute for Nanotechnology (IIN) at NU
- National Science Foundation (NSF) [CHE-1308107]
- US-UK Fulbright Commission
- Fulbright Scholars Program
Investigating through-space electronic communication between discrete cofacially oriented aromatic pi-systems is fundamental to understanding assemblies as diverse as double-stranded DNA, organic photovoltaics and thin-film transistors. A detailed understanding of the electronic interactions involved rests on making the appropriate molecular compounds with rigid covalent scaffolds and pi-pi distances in the range of ca. 3.5 angstrom. Reported herein is an enantiomeric pair of doubly-bridged naphthalene-1,8:4,5-bis(dicarboximide) (NDI) cyclophanes and the characterization of four of their electronic states, namely 1) the ground state, 2) the exciton coupled singlet excited state, 3) the radical anion with strong through-space interactions between the redox-active NDI molecules, and 4) the diamagnetic diradical dianion using UV/Vis/NIR, EPR and ENDOR spectroscopies in addition to X-ray crystallography. Despite the unfavorable Coulombic repulsion, the singlet diradical dianion dimer of NDI shows a more pronounced intramolecular pi-pi stacking interaction when compared with its neutral analog.
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