title: Synthesis and characterization of water soluble O-carboxymethyl chitosan Schiff bases and Cu(II) complexes.
abstract: 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.
authors.affiliation: Department of Chemistry, Faculty of Science and Letters, Aksaray University, Aksaray, Turkey.
authors.forename: Talat
authors.initials: T
authors.lastname: Baran
authors.affiliation: Department of Chemistry, Faculty of Science and Letters, Aksaray University, Aksaray, Turkey. Electronic address: ayfermentes@yahoo.com.
authors.forename: Ayfer
authors.initials: A
authors.lastname: Menteş
authors.affiliation: Department of Chemistry, Faculty of Science and Letters, Bülent Ecevit University, Zonguldak, Turkey.
authors.forename: Hülya
authors.initials: H
authors.lastname: Arslan
mesh_terms: D000107:Acetylation; D066241:Carbon-13 Magnetic Resonance Spectroscopy; D048271:Chitosan / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D004055:Differential Thermal Analysis; D004553:Electric Conductivity; D008024:Ligands; D060328:Magnetic Phenomena; D008855:Microscopy, Electron, Scanning; D066244:Proton Magnetic Resonance Spectroscopy; D012545:Schiff Bases / Q000138:chemical synthesis* / Q000737:chemistry; D012995:Solubility; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry; D014867:Water / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D056831:Coordination Complexes; D008024:Ligands; C504164:O-carboxymethylchitosan; D012545:Schiff Bases; D014867:Water; D003300:Copper; D048271:Chitosan
keywords: (13)C CP-MAS NMR; Schiff base; Water soluble O-carboxymethyl chitosan