id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
iajs-382	Tomma, Jumbad H.; AL-Aliawi, Kadhim M. Lazim; Ali, Imad T.	Synthesis of New Asymmetrical Pyromellitdiimide and Their Amic Acids Containing Heterocyclic Unit	2017	13	.pdf	application/pdf	4761	306	71	The FTIR absorption-spectra showed the disappearance of absorption bands due to NH2 of the starting materials together with the appearance of new absorption stretching bands due to O-H of carboxylic moiety at (2350-3530) cm-1, C=O (carboxylic acid) at (1684-1709) cm-1 , C=O (amid) at (1632-1674) cm-1 and C=N (endocyclic) for [IV]a-c at (1609-1628) cm-1 of heterocyclic unit . The FTIR absorption-spectra, showed the disappearance of absorption peaks characterized of cyclic anhydride of pyromellitmonoimides [V]d-f together with the appearance of new absorption stretching bands due to O-H of carboxylic moiety at (2450-3520) cm-1, C=O (carboxylic acid) at (1663-1692) cm-1 , C=O (amid) at (1635-1645) cm-1 and C=N (endocyclic) at (1609-1630) cm-1 of heterocyclic unit .	cache/iajs-382.pdf	txt/iajs-382.txt