The coordination chain polymers of the transition metal ions Mn(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) with 1-carboxy-1 0 -hydroxy-2,2 0 -(1-isonitriloethylidyne-4-nitrilomethylidenephenyl)diphenyl (H 2 SB) have been synthesized and characterized on the basis of elemental analyses, infrared spectra, electronic spectra, magnetic measurements and thermogravimetric analyses.
The Schi base derived from terephthalaldehyde and o-aminophenol is known as N,N H -di(o-hydroxyphenyl)terephthalaldehydediimine and is termed here as H 2 SB. The polychelates of this Schi base having the general formula [M(SB)(H 2 O) 2 ] n [where M Mn(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II)] have been synthesized and characterized on the basis of elemental analyses, infrared spectra, electronic spectra, magnetic measurements and thermogravimetric analyses. The Schi base act as uninegative bidentate ligand and bonding occurs through the hydroxyl oxygen and nitrogen atoms. An octahedral geometry has been assigned to all of the prepared polychelates.
Kinetics of pyrolysis of cotton cellulose and cellulose acetate with different degrees of substitution have been studied. The range of decomposition temperature of the cellulose samples was found to decrease with the increase in degree of substitution. However, the stability of the polymer increased as the degree of substitution increased. Probable mechanism of degradation of the test samples is discussed. Energy of activation and order of reaction for the decomposition of polymer samples as well as for the residual materials have been determined and correlated with DTA measurements.
ZUSAMMENFASSUNG:Es wurde die Kinetik der Pyrolyse von Baumwoll-Cellulose und Celluloseacetat von verschiedenem Substitutionsgrad untersucht. Der Bereich der Zersetzungstemperatur der Celluloseproben nimmt mit steigendem Substitutionsgrad ab, die Stabilitat nimmt dagegen mit steigendem Substitutionsgrad zu. Es wird fur die untersuchten Proben ein wahrscheinlicher Abbaumechanismus diskutiert. Sowohl fur die Zersetzung der Proben als auch fiir die der Ruckstande wurden Aktivierungsenergie und Reaktionsordnung bestimmt und mit DTA-Messungen in Beziehung gesetzt.
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