Synthesis, Spectral Characterization, and Antimicrobial Activities of Schiff Base Complexes Derived From 4-Aminoantipyrine

Hydrazide Schiff Bases of Acetylacetonate Metal Complexes: Synthesis, Spectroscopic and Biological Studies

“…The azomethine proton signal at δ 8.71 ppm (1H, s), in the spectrum of the cobalt complex is shifted downfield compared to the free ligand, suggesting deshielding of the azomethine group due to the coordination with metal ions [21]. Aromatic protons at δ 8.45 (1H, s), δ 8.99 (1H, s), δ 8.37 (1H, s), δ 8.16 (1H, s), signals appearing as multiplets in the δ 6.14-7.26 ppm region are due to the aromatic protons, methylene protons at the range δ 2.51-3.36 (multiplets), methyl protons at δ 2.04 (3H, d), δ 1.11 (3H, t) ppm.…”

“…1 H NMR spectrum of the complex: Mg(acac)(L 1 ) exhibited singlet signals at δ 11.36 ppm which could be attributed to the proton of an amide nitrogen, azomethine proton signal at δ 8.44 ppm (1H, s), aromatic protons at 8.36 (1H, s), δ 8.35 (1H, s), δ 8.17 (1H, s), δ 8.15 (1H, s), signals appearing as multiplets in the δ 6.13-7.23 ppm region are due to the aromatic protons, methylene protons at the range δ 2.51-3.35 (multiplets), methyl protons at δ 2.14 (3H, d), δ 1.72 (3H, t), δ 1.11 (3H, t) ppm. The 13 C spectrum reveals the presence of ketonic carbon at δ 188.7 ppm, the signal of δ 161.0 ppm is due to the phenolic carbon, amide carbon at δ 160.3 ppm, δ 151.3 ppm (C=N) is due to carbon atom in the azomethine groups, aromatic carbons at δ 150.9, 149.6, 139.4, 132.1, 129.5, 124.1, 106.8, 104.2 ppm, methylene carbon at δ 44.3, 28.15 ppm, methyl carbon at δ 13.01 ppm [4,14,17,21].…”

“…The 13 The C spectrum reveals the presence of ketonic carbon at δ 189.01 ppm, the signal of δ 161.4 ppm is due to the phenolic carbon, amide carbon at δ 161.2 ppm, δ 152.2 ppm (C=N) is due to carbon atom in the azomethine groups, aromatic carbons at δ 150.3, 149.6, 140.0, 131.1, 129.5, 129.1, 123.3, 121.7, 112.3 ppm, methylene carbon at δ 26.0 ppm, methyl carbon at δ 13.2 ppm [4,14,17,21]. 1 H NMR spectrum of the complex: Mg(acac)(L 1 ) exhibited singlet signals at δ 11.36 ppm which could be attributed to the proton of an amide nitrogen, azomethine proton signal at δ 8.44 ppm (1H, s), aromatic protons at 8.36 (1H, s), δ 8.35 (1H, s), δ 8.17 (1H, s), δ 8.15 (1H, s), signals appearing as multiplets in the δ 6.13-7.23 ppm region are due to the aromatic protons, methylene protons at the range δ 2.51-3.35 (multiplets), methyl protons at δ 2.14 (3H, d), δ 1.72 (3H, t), δ 1.11 (3H, t) ppm.…”

“…The 13 C spectrum reveals the presence of ketonic carbon at δ 189.01 ppm, the signal of δ 162.6 ppm is due to the phenolic carbon, amide carbon at δ 162.2 ppm, δ 151.9 ppm (C=N) is due to carbon atom in the azomethine groups, aromatic carbons at δ 148.5, 129.8, 128.8, 126.3, 122.3, 112.3 ppm, methoxy carbon at 97.3 ppm, methylene carbon at δ 55.9 and 26.0 ppm, methyl carbon at δ 13.3 ppm ( fig. 10) [4,14,17,21].…”

Two new zinc(II) acetates with 3– and 4–aminopyridine: syntheses and structural properties

“…Zinc supplementation has a significant effect on growth and body weight gain in children and results in decreased child mortality. 2 Zinc coordination compounds have been successfully tested for treatment of diabetes 3 whilst other papers report their excellent antibacterial, 4,5 antifungal, 5,6 anti-inflammatory, 7 and antioxidant 8 activities, including their use as antitumor antibiotics 9 and antihypertensive drug. 10 Most studies indicate that zinc coordination compounds exhibit greater antimicrobial activity than the parent ligands.…”