Synthesis, Spectral Characterization and Antibacterial Investigation of Ni(II) Coordination Complexes of Macrocyclic Schiff base ligands Derived from 4-Aminoantipyrine

Abstract

I S S N 2 3 2 1 -807X V o l u m e 1 3 N u m b e r 1 J o u r n a l o f A d v a n c e s i n c h e m i s t r y around the metal ion.Octahedral geometry have been assigned for all complexes. All ligands and complexes were examined for antibacterial activity and found that complexes were more potent when compared to ligands. |

Bifunctional Dinuclear Complexes Based on Iminodiacetate and 1,2-Di(4-pyridyl)ethylene: Crystal Structures, Vapochromism, and Iodine Adsorption

“…The electronic spectrum of 1 (Figure S5) shows electronic absorption bands for octahedral Ni­(II) centers ν 1 : 3 A 2g → 3 T 2g at 992 nm (10 800 cm –1 ), ν 2 : 3 A 2g → 3 T 1g (F) at 623 nm (16 051 cm –1 ), and ν 3 : 3 A 2g → 3 T 1g (P) at 380 nm (26 315 cm –1 ). Complex 2 exhibits a broad absorption band at 705 nm (14 184 cm –1 ) in agreement with the d xz , d yz , d xz , d z 2 → d x 2 – y 2 transition for the distorted square pyramidal geometry. , The thermal stability of 1 and 2 was studied by thermogravimetric analysis (TGA). The TGA profile (Figure S6) of 1 shows two steps of weight loss in the temperature ranges 30–90 °C and 115–170 °C that indicate the release of six lattice water (Found, 14.08%; Anal.…”

“…The adsorption spectrum of 1b also remains the octahedral geometry of Ni(II) centers (Figure S10). 60,61 In addition, the PXRD pattern (Figure 3b) of 1b is clearly different from that of 1, indicating the structural transformation after the dehydration process, whereas, the crystalline structure of activated form 1a (1 was heated at 90 °C) is stable as similar to that of 1. In addition, 1b can be restored to the original crystalline phase of 1 after being soaked in water at room temperature overnight (40 mg of 1b/mL of water).…”

“…Complex 2 exhibits a broad absorption band at 705 nm (14 184 cm −1 ) in agreement with the d xz , d yz , d xz , d z 2 → d x 2 −y 2 transition for the distorted square pyramidal geometry. 60,61 The thermal stability of 1 and 2 was studied by thermogravimetric analysis (TGA). The TGA profile (Figure S6) of 1 shows two steps of weight loss in the temperature ranges 30−90 °C and 115−170 °C that indicate the release of six lattice water (Found, 14.08%; Anal.…”