Table 3.

¹H and ¹¹⁹Sn NMR spectral data for 1–4.

Complex	NMR (DMSO-d6; δ in ppm and J in Hz)
	1H (500 MHz)	119Sn (107 MHz)
1	7.73–7.06 (m, 23H, Ar), 6.95 (s, exch., 1H, NH), 4.62 (s, 2H, CH2), 4.47 (d, J = 7.2 Hz, 1H, CH), 2.22 (br, 1H, CH), 2.14 (t, J = 7.4 Hz, 2H, CH2), 1.40–1.29 (m, 4H, CH2CH2), 0.94 (d, J = 7.2 Hz, 6H, 2 Me), 0.78 (t, J = 7.4 Hz, 3H, Me)	−137.8
2	7.66–7.55 (m, 6H, Ar), 7.20 (d, J = 8.1 Hz, 1H, Ar), 7.08 (d, J = 8.1 Hz, 1H, Ar), 6.95 (s, exch., 1H, NH), 4.63 (s, 2H, CH2), 4.51 (d, J = 7.2 Hz, 1H, CH), 2.21 (br, 1H, CH), 2.08 (m, 2H, CH2), 1.60–1.30 (m, 22H, 11 CH2), 1.13–0.85 (m, 18H, 6 Me)	−131.2
3	7.70–7.53 (m, 8H, Ar), 7.37–7.00 (m, 18H, Ar), 6.97 (s, exch., 2H, 2 NH), 4.66 (s, 4H, 2 CH2), 4.49 (d, J = 7.1 Hz, 2H, 2 CH), 2.22 (br, 2H, 2 CH), 2.09 (t, J = 7.5 Hz, 4H, 2 CH2), 1.38–1.25 (m, 8H, 2 CH2CH2), 0.92 (d, J = 7.1 Hz, 12H, 4 Me), 0.80 (t, J = 7.5 Hz, 6H, 2 Me)	−406.1
4	7.68–7.62 (m, 12H, Ar), 7.20 (d, J = 8.2 Hz, 2H, Ar), 7.08 (d, J = 8.2 Hz, 2H, Ar), 6.97 (s, exch., 2H, 2 NH), 4.63 (s, 4H, 2 CH2), 4.46 (d, J = 7.1 Hz, 2H, 2 CH), 2.20 (br, 2H, 2 CH), 2.09 (m, 4H, 2 CH2), 1.65–1.29 (m, 20H, 10 CH2), 1.16–0.87 (m, 24H, 8 Me)	−218.1