PREPARATION, SPECTROSCOPIC AND CATALYTIC STUDIES OF ETHYLIDYNENITRILO-1,4-PHENYLENENITRILOMETHYLIDYNE) PROTONATED WITH SELECTED HETEROPOLYACIDS

thylidynenitrilo-1,4-phenylenenitrilomethylidyne), (PIM), i.e. polyimi ne obtained via condensation of p-phenylenediamine and terephtalaldehy de, has been prepared and protonated with selected Keggin type heterop olyacids (H3PMo12O40, and H3PW12O40). Both, unprotonated and protonate d PIM have been characterized by LR spectroscopy, X-ray diffraction me asurements and thermal studies. Heteropolyacids inserted into PIM matr ix preserve their structural identity. PIM-heteropolyacids systems exh ibit high thermal stability, They are catalytically active in isopropa nol conversion showing enhanced redox activity.