Cooperative C?F?Si interaction in optically active helical polysilanesElectronic Supplementary Information (ESI) available: experimental section, 29Si NMR of PS-5 and PS-6, variable-temperature 29Si NMR of PS-5 and PS-6, 19F NMR of PS-1 and PS-5, and IR spectra of PS-5. See http://www.rsc.org/suppdata/cc/b3/b314723a/

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