. Author manuscript; available in PMC: 2011 Dec 8.

Published in final edited form as: Appl Magn Reson. 2010 Dec 1;39(4):437–451. doi: 10.1007/s00723-010-0179-z

Table 1.

Spectroscopic parameters of the imidazoline (Im) and imidazolidine (In) nitroxides and their protonated forms (in parenthesis)

	R₁	R₂	R₃	R₄	R₅	a_N (mT) H₂O/NaOH (H₂O/HCl)	a_H1 (mT) H₂O/NaOH (H₂O/HCl)	a_H2 (mT) H₂O/NaOH (H₂O/HCl)	a_N (mT) toluene	a_H1 (mT) toluene	a_H2 (mT) toluene
Im1	Me	Me	Me	Me	Me	1.566 (1.480)	−/−	−/−	1.422	–	–
Im2	Et	Et	Et	Et	Me	1.517 (1.418)	−/−	−/−	1.374	–	–
In1	Me	Me	Me	Me	Me	1.601 (1.476)	−/−	−/−	1.439	–	–
In2	Et	Et	Me	Me	Me	1.552 (1.420)	0.143 (0.191)	−/−	1.385	0.143	–
In3	Me	Me	Et	Et	Me	1.569 (1.432)	0.201 (0.245)	−/−	1.398	0.158	–
In4	Et	Et	Et	Et	Me	1.528 (1.392)	0.242 (0.256)	0.181 (0.205)	1.369	0.206	0.173
In4d	CD₂CH₃	CD₂CH₃	CD₂CH₃	CD₂CH₃	Me	1.530 (1.395)	−/−	−/−
In5	C₄H₉	C₄H₉	Me	Me	Me	1.566 (1.436)	0.140 (0.190)	−/−
In6	(CH₂)₄		Me	Me	Me	1.614 (1.476)	−/−	−/−
In7	(CH₂)₅		Me	Me	Me	1.593 (1.465)	0.274 (0.275)	−/−
In8	(CH₂)₅		Et	Et	Me	1.544 (1.408)	0.250 (0.270)	0.070 (0.090)
In9	Me	Me	Me	(CH₂)₄		1.614 (1.484)	0.137 (0.124)	−/−
In10	(CH₂)₅		Me	(CH₂)₄		1.620 (1.495)	0.270 (0.272)	0.063 (0.063)

Accuracy of hyperfine splitting constants measurement is 0.007 mT