Motivated by work showing that magnetic coupling between TCNQ anions in potassium TCNQ (KTCNQ) can be changed simply by changing the aromatic substituents, we seek to qunatify this behaviour. This can be achieved by different levels of fluorination on the quinodial ring and we would study the series TCNQ, TCNQF, TCNQF2 and TCNQF4, where there is an increasing number of F atoms substituted on the ring through the series itself. There has already been shown to be a shift between the muon-radical hyperfine coupling between TCNQ and TCNQF4 however more work is needed to be able to understand how this shift varies and whether we can in fact control the distrobution of spin density across the molecule. It is hoped this will then provide vital infomation as the the non-linearity of the way the transition temeprature depneds on F substitution.