Bioinorganic Chemistry and Applications

Research Article

Synthesis, Spectroscopic, Molecular Structure, and Antibacterial Studies of Dibutyltin(IV) Schiff Base Complexes Derived from Phenylalanine, Isoleucine, and Glycine

Table 3

1H NMR spectral dataa of the ligands and their corresponding organotin(IV) complexes.
CompoundsChemical Shift (, ppm)
L1H11.50 (s, 1H, COOH), 4.25 (t, 1H, N–CH–CH2–), 3.08 (d, 2H, –CH2–Ph), 8.01 (s, 1H, NH), 7.20–7.80 (m, 9H, aromatic).
Bu2Sn(L1)24.21 (s, 1H, N–CH–CH2), 3.10 (d, 2H, –CH–CH2–Ph), 8.03 (s, 1H, NH), 7.10–7.75 (m, 9H, aromatic); 1.60–1.15 (br m. 6H, –CH2–CH2–CH2–); 0.82 (br t, 3H, CH3 of butyl groups).
L2H11.39 (s, 1H, COOH), 3.96 (d, 1H, N–CH–CH–), 2.10–2.16 (m, 1H, CH3–CH–CH2–), 1.50–1.60 (m, 2H, –CH–CH2–CH3), 8.05 (s, 1H, NH), 0.85 (d, 3H, –CH–CH3), 0.95 (t, 3H, –CH2–CH3), 7.25–7.82 (m, 4H, aromatic).
Bu2Sn(L2)23.98 (d, 1H, N–CH–CH), 2.08–2.16 (m, 1H, CH2–CH–CH3), 0.80 (d, 3H, –CH–CH3), 1.48–157 (m, 2H, CH–CH2–CH3), 0.99 (t, 3H, –CH2–CH3); 8.10 (s, 1H, NH), 7.22–7.80 (m, 4H, aromatic); 1.65–1.21 (br m. 6H, –CH2–CH2–CH2–); 0.80 (br t, 3H, CH3 of butyl groups).
L3H11.28 (s, 1H, COOH), 4.30 (s, 2H, N–CH2–), 8.02 (s, 1H, NH), 7.28–7.80 (m, 4H, aromatic).
Bu2Sn(L3)24.38 (s, 2H, N–CH2–), 8.05 (s, 1H, NH), 7.25–7.78 (m, 4H, aromatic); 1.62–1.18 (br m. 6H, –CH2–CH2–CH2–); 0.84 (br t, 3H, CH3 of butyl groups).
L4H11.42 (s, 1H, COOH), 3.97 (d, 1H, N–CH–CH2–), 3.15 (d, 2H, –CH2–Ph), 8.08 (s, 1H, NH), 7.20–7.85 (m, 8H, aromatic);
Bu2Sn(L4)24.02 (t, 1H, N–CH–CH2), 3.08 (d, 2H, –CH2–Ph), 8.10 (s, 1H, –NH–), 7.20–7.75 (m, 8H, aromatic); 1.60–1.15 (br m. 6H, –CH2–CH2–CH2–); 0.80 (br t, 3H, CH3 of butyl groups).
L5H11.42 (s, 1H, COOH), 3.99 (d, 1H, N–CH–CH), 2.08–2.14 (m, 1H, CH3–CH–CH2), 1.42–1.58 (m, 2H, CH–CH2–CH3), 8.10 (s, 1H, NH), 0.82 (d, 3H, –CH–CH3), 0.98 (t, 3H, –CH2–CH3), 7.20–7.80 (m, 3H, aromatic).
Bu2Sn(L5)24.01 (d, 1H, N–CH–CH), 2.10–2.20 (m, 1H, CH3–CH–CH2), 0.80 (d, 3H, –CH–CH3), 1.45–1.58 (m, 2H, –CH–CH2–CH3), 1.02 (t, 3H, CH2–CH3), 8.05 (s, 1H, NH), 7.20–7.82 (m, 3H, aromatic); 1.64–1.18 (br m. 6H, –CH2–CH2–CH2–); 0.82 (br t, 3H, CH3 of butyl groups).
L6H11.35 (s, 1H, COOH), 4.32 (s, 2H, –CH2–), 8.12 (s, 1H, NH), 7.20–7.76 (m, 3H, aromatic).
Bu2Sn(L6)24.40 (s, 2H, N–CH2–), 8.10 (s, 1, NH), 7.28–7.76 (m, 3H, aromatic); 1.65–1.21 (br m. 6H, –CH2–CH2–CH2–); 0.85 (br t, 3H, CH3 of butyl groups).
Chemical shift () in ppm: Multiplicity is given as: s = singlet, d = doublet, t = triplet, q = quartet, m = complex pattern, br = broad.