Chemical and Biological Technologies in Agriculture

Table 2 T ₁ and T ₂ relaxation time values for protons of IAA, 2-NAA, and 2,4-D

From: pH-controlled release of auxin plant hormones from cucurbit[7]uril macrocycle

¹H^a	T₁(s)				T₂(s)
	pH 1.0		pH 12.0		pH 1.0		pH 12.0
	−CB[7]	+CB[7]	−CB[7]	+CB[7]	−CB[7]	+CB[7]	−CB[7]	+CB[7]
IAA
a	5.184	5.067	5.342	4.727	3.157	0.384	2.559	2.500
b	7.427	6.766	7.531	6.533	4.690	0.466	2.677	2.547
c	4.512	4.337	6.236	5.765	1.372	0.496	2.535	2.240
d	4.071	3.714	4.014	3.645	1.276	0.402	2.425	2.279
e	9.158	8.244	8.911	7.945	1.986	0.350	3.025	3.025
f	1.681	1.643	1.642	1.617	0.678	0.414	1.398	1.364
2-NAA
g	3.415	2.063	4.042	2.625	2.351	0.079	2.063	0.803
h	3.114	2.758	4.172	2.405	1.410	0.098	2.483	1.257
i	3.876	2.629	4.252	3.413	1.629	0.078	2.399	1.099
l	4.531	3.075	3.879	3.119	2.108	0.103	2.420	1.852
m	1.447	1.401	3.656	1.853	1.130	0.693	1.266	1.130
n	ND	ND	ND	ND	ND	ND	ND	ND
2,4-D
o	8.030	3.557	6.659	5.832	4.521	0.447	1.290	1.319
p	4.465	2.471	3.440	3.252	3.435	0.152	0.993	1.104
q	3.294	1.642	2.031	2.514	3.122	0.104	1.120	0.981
r	ND	ND	ND	ND	ND	ND	ND	ND

^aAuxin protons in IAA, 2-NAA and 2,4-D, in the absence and presence of CB[7], at pH 1.0 and 12.0. Letters indicate positions of protons on auxins structure as reported in Figure 2. ND, not determined.

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