Cathodic shift ΔE (mV) of 1.XB/HB and 2.XB/HB_SAM in ACN or ACN/H₂O 99 : 1 in the presence of 50 mM of various anions unless otherwise stated. N.r. – no response. — – not carried out. Estimated error ± 5 mV.

	ACN		ACN/H2O 99 : 1
	1.XB	1.HB	1.XB	1.HB	2.XBSAM	2.HBSAM
Cl−	−79	−37	−63	−44	−118	−114
Br−	−57	−45	−57	−32	−34a	−31a
HSO4−	−65	−51	−62	−53	−96	−106
H2PO4−	−173b	−109b	−147	−59b	−158b	−175b
NO3−	−35	N.r.	−36	N.r.	−43	−45
OBz−	−106	−62	−78	N.r.	—	—

^aΔE at ≈2 mM, response not plateauing.

^bΔE at <50 mM, response at plateau.