Five complexes of 3-methyl-4 -(phenylhydrazono)-1-phthalazinyl-2-pyrazolin-5-one (LH) were synthesized. The ligand and complexes were characterized using elemental analyses and various analytical techniques such as IR, UV, NMR, mass spectra, magnetic susceptibility measurements, and thermal decomposition studies such as TG/DTG. The geometries of the complexes with special emphasis on the versatile ligational behavior of LH are discussed. All five complexes have octahedral geometry. In four of the complexes [M(LH)Cl 3 ] where M ¼ Fe(III)/ Cr(III) and [M(LH)(OAc) 2 H 2 O] and M ¼ Cu(II)/Ni(II), the ligand was neutral and tridentate. Another copper complex [CuL(OAc)(H 2 O) 2 ] in which the ligand is tridentate, mono-anionic one was also obtained in an excess of aqueous solution. Antifungal studies of the compounds are also carried out.

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Transparent polymers when incorporated with strongly fluorescent europium chelates were found to be responding to excitation with UV radiation. In this work, two novel europium chelates have been synthesized using the b-diketones dimedone and phenylazo dimedone along with 1,10-phenanthroline. These chelates were characterized by elemental analyses, magnetic susceptibility measurements, UV, IR, and ESI mass spectral techniques. The chelates synthesized with metal : b-diketone : 1,10-phenanthroline ratio 1 : 3 : 1 were incorporated into polymer matrices. Four polymers, polyethylene vinyl acetate or acetate (EVA), polystyrene (PS), poly methyl methacryalate (PMMA), and polyethylene glycol (PEG) were used for the studies. All these, except the liquid oligomer PEG were cast into thin films. PEG was used as such for the studies. The photoluminescence spectra of the plain polymers were found to be having peaks very close to the absorption peaks of the polymers doped with europium chelate. This observation can be used in optical devices. Thermal analyses like TG/DTG/DTA of the polymer films were conducted to ascertain the thermal stability of the material. The SEM analyses of the films indicated a smooth surface with uniform distribution of the doped chelate.

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