In the field of energy transport and conversion through molecular junctions(MJs),there are two outsdanding questions.The first question is: is the electronic transport in MJs coherent? There is some experimental evidence that this is indeed the case,yet these experiments compare different junctions with different molecules,and there is no control parameter which can be tuned in the same junction that will demonstrate the coherence.The second question is: can one increase the thermopower and the thermoelectric efficiency (manifestly the figure of merit)in MJs? While ideally,MJs should have a very large FOM and thermopower,in practice they turn out to be rather poor thermoelectrics.In this talk I will present a system which may help answer both these questions: a Helicene-based molecular junction.Helicenes are molecules composed of a series of connected carbon rings arranged in a Helical structure,forming a "stiff spring" made of carbon rings.The idea is that by pulling and pushing the electrodes,the electronic structure of the molecule can be tuned in-situ due to the spring-like structure of the bridging molecule.This will affect both conductance and thermopower of the molecular junction,but only if the transport is coherent.I will present some calculations which show that both the conductance and thermopower indeed depend dramatically on the distance between electrodes,thus providing qualitative predictions and motivation for future experiments.