Fourier-Transform IR spectroscopic investigations of Cobalt(II)–dextran complexes by using D₂O isotopic exchange

Abstract

Co(II) ion complexes with reduced low-molar dextran (RLMD) derivativesMw= 5000 − 6000 g/mol, their FTIR spectroscopic characterization, as well as the spectra-structure correlation was investigated in this work. The samples of Co(II) ion complexes with RLMD were deuterated (D2O, Merck) for 2 h, at room temperature, in vacuum. FTIR spectra as an average of 40 scans were recorded at room temperature in the range 4000 – 400 cm−1. FTIR investigation of Co(II)–RLMD complexes by D2O isotopic exchange proved to be a very sensitive method for determining OH group coordination and is related to the hydrogen bond strength. The results of our investigation point to the dextran and their complexes with Co(II) ion are crystalline hydrate molecules. The correlation of physicochemical, spectrophotometric and spectroscopic investigations of these complexes, coordination chemistry of Co(II) ion and the structure of an exopolysaccharide chain are proposed different model structures of the synthesized Co(II) complexes.

Structural elucidation of an extracellular polysaccharide produced by the marine fungus Aspergillus versicolor

“…The band at 916 cm −1 was due to the asymmetric telescopic vibration of glucopyranose ring, and the band at 845 cm −1 indicated the presence of ␣-anomeric configuration. The bands at 916 and 845 cm −1 also indicated that the glucopyranose units in AWP had a C 1 chair conformation (Mitić et al, 2009(Mitić et al, , 2010Shingel, 2002).…”

“…IR spectrum of AWP. Ilić, & Nikolić, 2008;Mitić, Cakić, & Nikolić, 2010;Mitić et al, 2009Mitić et al, , 2011. The bands at 1456 and 1342 cm −1 were the absorption peaks of variable angle vibration of C H bond.…”

Nano-biocomplexes based on oligosaccharides and their derivates

“…FTIR spectra of RLMD and Co(II)-RLMD complexes were compared with the deconvoluted spectra of their analogues recrystallized from D 2 O [43][44][45]. FTIR spectra were measured in order to find the specific spectral peculiarities, i.e.…”

Study of Green Nanoparticles and Biocomplexes Based on Exopolysaccharide by Modern Fourier Transform Spectroscopy

“…Bioligands or synthetic ligands are mostly natural macromolecular compounds. These products of special importance mostly represent complexes of different metals (Fe, Co, Cu, Zn) with ligands of polysaccharide type (such as pullulan, inulin, dextran) [43][44][45]. However, the native polysaccharide possessing antigen characteristics wherefore is not of pharmaceutical importance [18].…”