Synthesis and characterization of water soluble O-carboxymethyl chitosan Schiff bases and Cu(II) complexes.
In this study, mono-imine was synthesized (3a and 4a) via a condensation reaction between 2,4-pentadion and aminobenzoic acid (meta or para) in alcohol (1:1). The second-imine (CS-3a and CS-4a) was obtained as a result of the reaction of the free oxo groups of mono-imine (3a and 4a) with the amino groups on the chitosan (CS). Their structures were characterized with FTIR and (13)C CP-MAS. Then, the water soluble forms of CS-3a and CS-4a were obtained through oxidation of the hydroxide groups on the chitosan to carboxymethyl groups using monochloracetic acid ([O-CMCS-3a] · 2H2O and [O-CMCS-4a] · 2H2O). Thus, the solubility problem of chitosan in an aqueous media was overcome and Cu(II) complexes could be synthesized more easily. Characterization of the synthesized O-carboxymethyl chitosan Schiff base derivatives and their metal complexes, [O-CMCS-3a-Cu(OAc)2] · 2H2O and [O-CMCS-4a-Cu(OAc)2] · 2H2O, was conducted using FTIR, UV-Vis, TG/DTA, XRD, SEM, elemental analysis, conductivities and magnetic susceptibility measurements.
['Baran|Talat|T|', 'Menteş|Ayfer|A|', 'Arslan|Hülya|H|']
D000107:Acetylation D066241:Carbon-13 Magnetic Resonance Spectroscopy D048271:Chitosan D056831:Coordination Complexes D003300:Copper D004055:Differential Thermal Analysis D004553:Electric Conductivity D008024:Ligands D060328:Magnetic Phenomena D008855:Microscopy, Electron, Scanning D066244:Proton Magnetic Resonance Spectroscopy D012545:Schiff Bases D012995:Solubility D013056:Spectrophotometry, Ultraviolet D017550:Spectroscopy, Fourier Transform Infrared D013818:Thermogravimetry D014867:Water D014961:X-Ray Diffraction
Water soluble O-carboxymethyl chitosan Schiff base (13)C CP-MAS NMR