Novel Organotin(IV) Schiff Base Complexes with Histidine Derivatives: Synthesis, Characterization, and Biological Activity
Table 1
1H NMR data of compounds 1–5.
Compound numbering
1 CDCl3
2 CDCl3
3 CD3OD
4 CDCl3
H11
8.13 (s, 1H) [58]
7.91 (s, 1H) [52]
8.33 (s, 1H) [70]
8.34 (s, 1H)
H17
7.63 (s, 1H)
7.60 (s, 1H)
7.08 (s, 1H)
7.48 (s, 1H)
H5
7.54 (d, 1H) [2.4]
7.51 (d, 1H) [2.7]
7.63 (d, 1H) [2.4]
7.35 (d, 1H) [2.4]
H3
6.85 (d, 1H) [2.4]
6.76 (d, 1H) [2.7]
7.07 (d, 1H) [2.5]
7.03 (d, 1H) [2.4]
H19
6.80 (s, 1H)
6.73 (s, 1H)
6.52 (s, 1H)
6.73 (s, 1H)
H12
4.43 (m, 1H)
4.43 (m, 1H)
4.59 (m, 1H)
4.14 (m, 1H)
H14
3.39–3.25 (m, 2H)
3.47–3.44 3.11–3.07 (m, 2H)
3.27–3.16 (m, 2H)
3.31–3.15 (m, 2H)
H
1.73–1.51 (m, 4H)
1.27–1.28 (m, 6H)
H
1.4–1.3 (m, 4H)
1.27–1.28 (m, 6H)
H
1.4–1.3 (m, 4H)
1.53 (m, 6H)
H
0.92 (t, 3H) [7.3] 0.79 (t, 3H) [7.3]
0.80 (t, 9H) [7.3]
Ho
7.87–7.82 (m, 4H)
Hm
7.58–7.29 (m, 4H)
Hp
7.58–7.29 (m, 4H)
H8, H10 t-butyl CH3
1.37 (s, 9H) 1.28 (s, 9H)
1.37 (s, 9H) 1.25 (s, 9H)
1.47 (s, 9H) 1.30 (s, 9H)
1.41 (s, 9H) 1.28 (s, 9H)
CH3-Sn
0.64 (s, 6H), 0.56 (s, 6H)
Data obtained at 500 MHz. Chemical shifts in ppm with respect to TMS; coupling constants in hertz, (1H–1H) and (1H–119/117Sn) between brackets. s: singlet; d: doublet; t: triplet; m: complex pattern. Assignment base in 1D and 2D NMR studies.
