A series of pentavalent organoarsenic monohalides (F, Cl, and Br) were synthesized using a rigid tridentate ligand with a 2,2,2-trifluoro-1,1-diphenylethanol skeleton. The chloro derivative (4) could not be isolated due to its sensitivity to air, whereas the fluoro (5) and bromo derivatives (6) were isolated as crystalline solids. The X-ray crystallography of 5 and 6 revealed that both compounds adopted