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Anomalous Halogen-Halogen Interaction Assists Radial Chromophoric Assembly.
Journal of the American Chemical Society 2019 Februrary 12
The design of highly efficient supramolecular architectures that mimic competent natural systems requires a comprehensive knowledge of noncovalent interactions. Halogen bonding is an excellent noncovalent interaction that forms halogen-halogen (X2 ) as well as trihalogen interacting synthons. Herein, we report the first observation of a symmetric radial assembly of chromophores ( R-3 c space group) composed of a stable hexabromine interacting synthon (Br6 ) that further push the limits of our understanding on the nature, role and potential of noncovalent halogen bonding. Contrary to the destabilization proposed for Type-I X2 interactions, Br6 synthon possessing Type-I X2 interactions exhibit a stabilizing nature owing to the exchange-correlation component. The radial assembly of chromophores is further strengthened by intermolecular through-space charge transfer interaction. Br6 synthon driven 3-fold symmetric radial assembly render a lattice structure that reminisces the chromophoric arrangement in the light harvesting system 2 of purple bacteria.
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