. Author manuscript; available in PMC: 2010 Jun 15.

Published in final edited form as: Inorg Chem. 2009 Jun 15;48(12):5106–5116. doi: 10.1021/ic802440h

Table 6.

H⁺ affinity values and pK_a values in MeCN for the ligands studied.

Ligand	H⁺ affinity^a (kJ/mol)	pK_a (MeCN)	K_eq(Cl)

PPh₃	972.8	7.61^b	0.7
THF	822.1	1.1^c	0.8
MeCN	779.2	0	9.8
DMF	887.5	6.1^c	390
2-picoline	949.1	13.32^c	660
Pyridine	930	12.53^b	41000
CN^tBu	870.7	2.71^d	90000

Hunter, E. P.; J. Phys. Chem. 1998, 27, 3991–3999.

Kaljurand, I.; Kütt, A.; Sooväli, L.; Rodima, T.; Mäemets, V.; Leito, I.; Koppel, I. A. J. Org. Chem. 2005, 70, 1019–1028.

Izutsu, K. Acid-Base Dissociation Constants in Dipolar Aprotic Solvents; Blackwell Scientific: Oxford, 1990, pp 17–35.

Calculated: see ref 43 and Experimental Section.