id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
iajs-38	M. Abdulrasool, Jinan; T. Ali, Emad; H. Tomma, Jumbad	New Schiff – Bases Prepared From Pyromellitic Dianhydride Via Its Hydrazide Derivative	2017	16	.pdf	application/pdf	3576	253	72	The FTIR spectra , show the diappearnace of C=O group of the aldehydes used , and the formation of C=N at frequencies ranges -( 735 C bond of the hydrazone moiety at-N-, also the C 1 -cm) 1658- 1606( 1618 ) -, and finally the C=C aromatic bonds which appeared at (1435 1 -cm) 1130 .which may interfere with C=C groups 1 -cm The FTIR results show a sharp peak at ( 3172 group,and a band at 2due to NH )1 -) and (3340 cm1 -freqancy , and at (3282 cm ) due to the C=O group , this band was observed to be in lower frequency 1-(1697cm compared to that found in C=O group of the ester due to the resonance phenomena in the hydrazide moiety which lead to reduce the double bond order of (C=O) group and then to reduce the force constant of the bond , so that its frequency will be , then , reduced too [21].	cache/iajs-38.pdf	txt/iajs-38.txt