3.1 Synthesis of anion transporters 1-9 and crystallographic analysis of 1 Transporters 1-9 bearing aryl substituents on both sides of the PTSC core were synthesized by imine condensation of 4-butylbenzaldehyde with the corresponding phenylthiosemicarbazide. Single crystals of transporter 1 (CCDC 2103182) of suitable quality for X-ray diffraction were obtained via slow evaporation of a DMSO solution. Transporter 1 crystallizes in the monoclinic space group P21/c with two formula units in the asymmetric unit. The crystal structure highlights the thione form to be predominant due to the CS bond lengths (1.6869(