Table 2. Comparison of α and β Values from This Study vs Those from ref (20)^a.

α values from this study		α values from ref (20)
surface type, i	αi (×104 m–1 Å–2)	surface type, i	αi (×104 m–1 Å–2)
aliphatic C	–3 ± 1	aliphatic C	3 ± 3
hydroxyl O	7 ± 1	hydroxyl O	1 ± 2
amide O	49 ± 3	amide O	28 ± 10
amide N	–33 ± 2	amide N	–20 ± 7
carboxylate O	28 ± 1	carboxylate O	29 ± 2
cationic N	–14 ± 1	cationic N	–12 ± 4
aromatic C	–31 ± 1	aromatic C	–23 ± 4
phosphate O	48 ± 2	phosphate O	49 ± 4
amine N off aromatic rings	–53 ± 3	amine N off aromatic rings	–
aromatic N	27 ± 3	aromatic N	–

inorganic ion	βion (×102 m–1)	inorganic ion	βion (×102 m–1)
K+	8 ± 2	K+	5 ± 2
Cl–	7 ± 1	Cl–	–4 ± 4

^aCalculations used eq 4. Data for 15 compounds from this study were used in addition to data for 27 compounds from ref (19). α values for an amine N off an aromatic ring and an aromatic N atom types were calculated in addition to the atom types in ref (20).