. Author manuscript; available in PMC: 2009 Oct 2.

Published in final edited form as: Eur J Inorg Chem. 2007 Jul 31;2007(27):4340–4349. doi: 10.1002/ejic.200700354

Table 3.

Stability constants (log K) of DOTA-(amide)₄ ML-type complexes formed with several trivalent lanthanide ions Ln³⁺ (I = 1.0 M KCl, T = 25 °C).

Ln³⁺	DOTAM	DOTA-(MeAm)₄	DOTA-(AmEt)₄	DOTA-(gly)₄^a	DOTA^b
Ce³⁺	11.93(7)	12.68(1)	13.00(8)	13.02	23.4
Nd³⁺	12.40(5)	13.08(6)	14.37(2)	14.45	23.0
Eu³⁺	13.80(2)	13.67(8)^c	15.09(6)	14.84	23.5
Gd³⁺	13.12(4)^d	13.54(4)^e	14.83(25)	14.54	24.7
Dy³⁺	13.57(14)	13.84(5)	15.09(2)	14.37	24.8
Tm³⁺	13.46(2)	14.08(5)	14.74(3)	–	24.4
Lu³⁺	13.53(5)	13.91(3)	14.62(3)	14.25^f	25.4

Ref.[11]

Ref.[20]

log K_EuL = 13.17 from Refs.[14,15]

log K_GdL = 10.05 from ref.[12]

log K_GdL = 12.80 from refs.[14,15]

This value corresponds to the nearest neighbour (YbL) complex.