Experimental and theoretical [MPW1PW91/6-311+G(d,p)] relative ¹H chemical shift (in ppm) of 1a, 1b, 2a and 2b with the corresponding ligand (L¹–L²) in d₆-DMSO solvent.

Mol	H4	H5	H6	H7	Ha	Hb	Hc	Hd	He
1a	−0.03 [−0.02]	0.08 [0.01]	0.53 [0.79]	1.22 [1.25]	0.00 [0.05]	0.00 [−0.11]	−0.02 [−0.05]	0.08 [−0.02]	0.00 [ 0.02]
1b	−0.04 [−0.01]	0.06 [0.06]	0.79 [1.04]	1.29 [1.42]	−0.09 [0.00]	−0.03 [−0.13]	−0.05 [−0.05]	0.07 [−0.02]	−0.01 [ 0.02]
2a	0.01 [0.00]	0.11 [0.39]	0.55 [0.94]	1.24 [1.47]	0.43 [−0.02]	0.09 [−0.01]	0.04 [ 0.06]	0.01 [0.03]	0.02 [−0.04]
2b	−0.02 [0.00]	0.09 [0.07]	0.73 [1.16]	1.26 [1.53]	0.38 [0.20]	0.06 [−0.09]	0.02 [−0.06]	0.00 [0.05]	−0.01 [−0.04]