. Author manuscript; available in PMC: 2012 Jul 7.

Published in final edited form as: Dalton Trans. 2011 May 31;40(25):6759–6764. doi: 10.1039/c1dt10616c

Table 1.

The water residence lifetimes of the SAP and TSAP isomers of LnDOTAM chelates

Ln³⁺ ion	Solvent	Method	τ_M (SAP)	τ_M (TSAP)	Source
Eu³⁺	MeCN	¹H NMR	120 µs	2.6µs	Ref.3
Eu³⁺	MeCN	¹H NMR	106 µs	2.1µs	Ref.15
Eu³⁺	MeCN	¹⁷O NMR	135 µs	—	Ref.15
Eu³⁺	H₂O	¹H NMR	55 µs	—	This work
Gd³⁺	H₂O	¹⁷O NMR	19 µs^a		Ref. 3
Gd³⁺	H₂O	¹⁷O NMR	101–113 µs^b	2.5 µs^b	This work

This value of 1/k_ex^obs is the weighted average of the SAP and TSAP isomers.

Estimated values derived using eqn (1) and 2 and the τ_M value obtained by ¹⁷O NMR results reported in reference 3.