Synthesis, characterization, and preliminary antimicrobial evaluation of bisphenol‐A formaldehyde resin coordinated with transition metal complexes of ethylenediamine

Abstract

Coordination polymers containing bisphenol-A, formaldehyde, and transition metal complexes of ethylenediamine [M(en) 2 ] were synthesized by the reaction of bisphenol-A, formaldehyde, and M(en) 2 complex in alkaline medium, using M for Fe þ3 , Co þ2, Ni þ2 , Cu þ2 , and Zn þ2 . The materials were characterized by elemental analysis, FTIR, UV-Vis, 1 H-NMR spectra, TGA, and magnetic susceptibility measurement. The geometry of the central metal ions was determined by electronic spectral studies and magnetic moment measurement. The MAN and CAN bonds were confirmed by the IR spectra of the polychelates. The 1 H-NMR spectra of the chelating resins confirmed polycondensation with well-defined peaks for bridging methylene functions. Complexation studies with transition metal ions revealed effective coordination of the bisphenol-A formaldehyde resin. The antimicrobial activities of these chelated resins were screened against E. coli, S. dysantrea (bacteria), and C. albicans, A. niger (fungi) by using agar well diffusion method. All the polymeric chelates show promising antimicrobial activities.

Development of nanostructured green divalent manganese‐coordinated polyurea

“…This may be due to the coordination of the lone pair of NH to metal ions, thus cannot delocalize into the carbonyl part and results in the appearance of carbonyl frequency 1687 and 1720 cm −1 48 Presence of another additional peak at 449 cm −1 (Table 2) in Mn(II)‐GPUa, confirms the reaction of metal acetate to NH 2 of GPUa 45 . 1 H‐NMR spectra of GPUa and Mn(II)‐GPUa were performed in DMSO‐ d 6 , and chemical shifts, δ were recorded in ppm to elucidate their proposed structure (Figure 2a,b).…”

“…Peak position and intensity in their spectra are close to the predicted structure and coordination pattern. The spectra of GPUa (Figure 1a) exhibit a characteristic absorption band at 3270 cm −1 corresponding to NH stretching vibration 23 while the bands occurring at 3055 and 2856‐2988 cm −1 may be ascribed to aromatic CHCH and CH 3 symmetric/asymmetric stretching vibrations, respectively 45 . The strong band observed at 2279 cm −1 may be assigned to the CO stretching vibration of atmospheric CO 2 46 whereas the band at 1632 cm −1 may be assigned to >CO stretching vibration of urea carbonyl 47 .…”

Prevention of Na Corrosion and Dendrite Growth for Long-Life Flexible Na–Air Batteries

“… 39 Fourier transform infrared spectra (FTIR, Figure 1 f) were obtained to further reveal a rather similar chemical structure of the G4 gel and its liquid counterpart, especially in the fingerprint region of 1300–400 cm –1 . Only a new shoulder peak appears at about 1600 cm –1 , which is associated with the shear vibration of −NH 2 or the bending vibration of N-H. 40 , 41 Markedly, the FTIR results show that the G4 gel contained both G4 and EDA components.…”

Investigations of Nanoparticle Suspensions of Prussian Blue and Its Copper Analogue: Amine Functionalization and Electrochemical Studies

“…The synthesis was adapted with slight modifications from a previous procedure . CuCl 2 •2H 2 O (735.3 mg, 5.002 mmol) was dissolved in 5 mL of Milli-Q water.…”

“…The synthesis was adapted with slight modifications from a previous procedure. 29 CuCl 2 •2H 2 O (735.3 mg, 5.002 mmol) was dissolved in 5 mL of Milli-Q water. Ethylenediamine (0.674 mL, 10.0 mmol) was added dropwise into the CuCl 2 solution and the purple reaction mixture was stirred overnight at room temperature.…”