Synthesis, spectrochemical characterisation and catalytic activity of transition metal complexes derived from Schiff base modified chitosan

Synthesis, crystal structure and luminescent properties of a new samarium-fluorescein metal-organic framework

“…The MOF has lost 10% of its mass up to 318 C in two stages. This weight loss is due to the loss of coordinated water molecule [28] and the evaporation of the solvent DMF without the decomposition of chemical bonds [29]. Immediately after the removal of water and DMF, the third stage starts and it shows maximum endothermic decomposition peak at 532 C due to the decomposition of organic part.…”

Cu(II) and Pd(II) complexes of water soluble O-carboxymethyl chitosan Schiff bases: Synthesis, characterization

“…We observed two transitions for the ligands (OCMCS-5a:241 and 315 nm; OCMCS-6a: 248 and 320 nm), which corresponded to the aromatic ring -* and imine ( C N) n-*, respectively [19,26]. These transitions shifted to higher wavelengths for all metal complexes, which indicate metal ion coordination via nitrogen atoms of imine groups of OCMCS-5a and OCMCS-6a [40].…”

“…Chemical modifications, such as Schiff base formation, carboxymethylation and coordination with metal ions lead to decreases in the thermal decomposition temperature of chitosan [36,37]. In an earlier study the maximum thermal decomposition temperature (DTG max ) of CS was reported to be 302 • C (Fig.…”

“…The formation of Schiff bases with chitosan is one of its modifications. This is accomplished by the condensation of reactive carbonyls of aldehyde or ketone with amino groups on chitosan [19]. In particular, Schiff bases of 2,6-diacetylpyridine and its metal complexes are preferred because of their excellent physicochemical characteristics in coordination chemistry [20,21].…”

“…6e) were determined to be 197 and 206 • C, respectively. This decrease can be accounted for by (1) the lower number of amino [26,37,38].…”