Control of CT character is an important parameter that can have impact on a wide range of fields and applications from charge transfer in photosynthesis to the CT states that underpin phenomena such as TADF. In this work we have shown that fine control of the charge transfer character can be achieved through small alteration in the distance between a quinoline chromophore and aliphatic amine moiety. The important aspect of this work is that by simply changing the position of the cage nitrogen atom with respect to the quinoline unit the CT character can either be enhanced or reduced. If the nitrogen is closer to the quinoline a stronger TSCT transfer species can be obtained. Importantly for their application in sensors the pKa of the nitrogen atom on the cage can be modified and have minimal to zero effect on the emission profile. This provides an additional parameter for variation, potentially making these compounds extremely viable for use in biological sensors.