Table 2. ³¹P NMR Chemical Shifts (ppm) Measured in Toluene-d₈ at 298 K.

complex	δfree	δbound	Δδ	χfolda
C8-PO
A·D	53.7	58.7	5.0
AA·DD	53.6	58.8	5.2
AD·ADb	57.0	58.1	1.1	0.78 (0.01)
N8-PO
A·D	53.5	58.5	5.0
AA·DD	53.5	57.5	4.0
AD·AD	55.1	57.5	2.4	0.46 (0.08)
N7-PO
A·D	53.5	58.5	5.0
AA·DD	53.4	60.3	6.9
AD·AD	56.5	57.9	1.4	0.76 (0.05)
C9-PO
A·D	35.4	41.8	6.4
AA·DD	35.6	42.0	6.4
AD·AD	40.6	41.1	0.5	0.92 (0.01)
C7-POc
A·D	40.3	45.8	5.5
AA·DD	40.2	44.4	4.2
AD·ADd	40.2	44.1	3.9	0.18 (0.16)

^aAverage value and standard deviation (reported in parentheses) calculated from Δδ_A·D and Δδ_AA·DD using eq 11.

^bAD 2-mer 16.

^cExperiments carried out in CDCl₃ due to the high stability of the complexes in toluene-d₈.

^dAD 2-mer 44.