THERMALLY STABLE CO-ORDINATION POLYMER. PART I. METAL THIOSEMICARBAZONE OF NAPHTHAZARIN

For the first time the metal co-ordination polymer of thiosemicarbazone Las been synthesised. Thiosemicarbazone of naphthazarin and bivalent hexa-co-ordinating metal ions, like zinc or nickel, comprise the recurring group of the above copolymer. This group of co-ordination polymers is found to possess high thermal stability, indicated by differential thermal analysis. Unique thermal stability is shown by the zinc thiosemicarbazone of naphthazarin which starts slight decomposition at 450°.