POLYMER SUPPORTED N,N′-BIS(SALICYLIDENE) HYDRAZINE Co(II) SCHIFF BASE COMPLEX AND ITS CATALYTIC ACTIVITY

Free radical grafting of itaconic acid and glycidyl methacrylate onto PP initiated by organic peroxides

“…1, L1) show all the characteristic absorption bands: 1640 (CHN), 1600 and 850 (aromatic), 1000–1100 (SiOSi), and 800 and 1260 cm −1 (SiCH 3 ). The band at about 1275 cm −1 indicates the presence of the phenolic group CO in the ligand 31. The phenolic hydroxyl group available in the ligand also is evidenced by the large frequency band in the range of 2900–3400 cm −1 31…”

“…1, K1 and K2): the stretching vibration frequency of the CN group of the free ligand at 1640 cm −1 is shifted to a lower frequency for the complex (1630 cm −1 ) as a result of the bond formation between the nitrogen atom of the ligand and metal atom 37, 38. The absorption band at 1275 cm −1 , due to the ν(CO) phenolic in the spectrum of the free ligand, has undergone a shift to a high wave number at about 1325 cm −1 as a result of its involvement in the coordination reaction 31. The complexation effect is also pronounced via CN vibrations.…”

“…Therefore, in this study, it was expected that siloxane insertion would lead to polymeric structures with improved solubility and the ability to form films with potential applications as separation membranes, as catalysts, or as artificial oxygen carriers by reversible oxygen binding. The high flexibility of polymer backbones can cause changes in the geometry of polymer‐bound metal complexes, which is an important parameter for their use as catalysts 31…”

Synthesis, characterization, and acoustic properties of new soluble polyurethanes based on 2,2′‐[1,4‐phenylenebis(nitrilomethylylidene)diphenol and 2,2′‐[4,4′‐methylene‐di‐2‐methylphenylene‐1,1′‐bis(nitrilomethylylidene)]diphenol

“…However, the utility of substituted aromatic monomers prevents the close packing of macromolecular chains, so improved solubility of the polymers is exhibited. 17 As part of our continuing research into the synthesis of PUs 1,18 and polyureas, 19 we have prepared eight novel PUs by reacting 4,4 0 -diphenylmethane diisocyanate (MDI), toluene 2,4-diisocyanate (TDI), isophorone diisocyanate (IPDI), and hexamethylene diisocyanate (HDI) with 2,2 0 -[1,4-phenylenebis(nitrilomethylylidene)]diphenol (PbNMD) and 2,2 0 -[4, 4 0 -methylene-di-2-methylphenylene-1,1 0 -bis(nitrilomethylylidene)]diphenol (MdMPbNMD). The structures of PbNMD and MdMPbNMD have been confirmed with Fourier transform infrared (FTIR) spectroscopy, 1 H-NMR, and 13 C-NMR spectral data.…”

Metallation of tetradentate N2O2 Schiff base with Mn(II), Co(II), Cu(II) and Zn(II): synthesis, characterization and formation constants measurement

“…Schiff base complexes are once again topical in connection with self-assembling cluster complexes [9][10][11][12][13][14][15]. Schiff base complexes are known to be biologically important and serve as catalysts in various chemical and photochemical reactions [16][17][18][19][20].…”