Synthesis and thermal properties of a novel schiff base oligomer with a double azomethine group and its Co(II) and Mn(II) complexes

Karakaplan M., DEMETGÜL C., Serin S.

Journal of Macromolecular Science, Part A: Pure and Applied Chemistry, cilt.45, sa.5, ss.406-414, 2008 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 45 Sayı: 5
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1080/10601320801947197
  • Dergi Adı: Journal of Macromolecular Science, Part A: Pure and Applied Chemistry
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.406-414
  • Anahtar Kelimeler: Oligo-N,N'-bis (2,4-dihydroxybenzylidene) 1,2-phenylenediamine, Oligomer-metal complexes, Oxidative polycondensation, Schiff base oligomer, Thermal properties
  • Hatay Mustafa Kemal Üniversitesi Adresli: Hayır

Özet

Schiff base oligomer of N,N'-bis (2,4-dihydroxybenzylidene) 1,2-phenylenediamine (DHBPDA), with a double azomethine group, was synthesized from the oxidative polycondensation (OP) reaction with NaOCl as an oxidant in an aqueous alkaline medium at 90C. About 75% DHBPDA was converted to O-DHBPDA. The structures of the products were studied by UV-Vis, FT-IR, 1H-NMR, 13C-NMR and elemental analysis. According to Gel Permeation Chromatography (GPC) analysis of O-DHBPDA, the number average molecular weight (Mn), weight average molecular weight (Mw) and PDI values were found to be 4328g mol-1, 6228g mol-1 and 1.43, respectively. TG/DTA analyses were shown to be stable of O-DHBPDA against thermo-oxidative decomposition. During the polycondensation reaction, a part of the azomethine (-CH=N-) groups oxidized to aldehyde (CHO) group (10-12%). Oligomer-metal complexes of oligo-N,N'-bis (2,4-dihydroxybenzylidene) 1,2-phenylenediamine (O-DHBPDA) with Co(II) and Mn(II) were synthesized and characterized by FT-IR, UV-Vis, TG-DTA and Atomic Absorption Spectroscopy (AAS). The residue of DHBPDA, O-DHBPDA, O-DHBPDA-Co and O-DHBPDA-Mn were found to be 0%, 3.65%, 11.67%, and 9.20%, respectively at 1000C.