Helical structures important in biological systems

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Presentation transcript:

Helical structures important in biological systems Helical polymers are used for various applications Polymers with dynamic chirality can be used as chirality sensors and actuators The reports on redox active helical polymers is limited to polysaccharides with redox active units This report describe a helical system with redox active main chain

Chiral symmetry breaking? Spontaneous resolution ? Chiral symmetry breaking?

t1/2 = 44h Rate constant k = 2.18x10-6 s-1 Energy for helix inv. = 96.6 kJ/mol t1/2 = 352 s Rate constant k = 9.84x10-4 s-1 Energy for helix inv. = 88.3 kJ/mol

Summary Demonstrate the chiral symmetry breaking crystallization Enantiomeric excess by stirred crystallization OP8NO2 is conformationally locked by an attractive force operating between the densely packed phenylene units On reduction o0f one electron the repulsive interaction between the condensed  clouds can be reduced. The present work sheds light in to the dynamic aspects of the  -bonding.