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The present paper describes the synthesis of 0.1 mol% Gadolinium (Gd) doped Zinc oxide (ZnO) nanophosphor by solution combustion method using Oxalyl dihydrazide (ODH) fuel. Powder X-ray diffraction (PXRD) peaks are well matched with the standard hexagonal wurtzite structure of ZnO (JCPDS card no. 36-1451). SEM and TEM analysis reveals porous morphology of as-formed sample with particles having narrow size distribution in the range ∼60-70 nm, in good agreement with XRD data. The PL spectrum of Gd doped ZnO sample exhibits an extra blue emission at 441 nm (∼2.81 eV) in addition to the emission bands from undoped ZnO. From the TL data of ZnO:Gd nanophosphor with UV irradiation, it is observed that considerable amount of re-trapping is taking place in all the TL second order peaks. The EPR spectrum exhibits a number of resonance signals suggesting that Gd 3+ ions are experiencing different crystal field strength and Zeeman interactions.

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Complexes of rhodium and iridium of the types MX3L, MX(CO)2L and MX3(CO)L (X = halide) containing multidentate N-heterocycles (L), 2,6-bis(benzimidazolyl)pyridine (bBzlH2py) and 2,6-bis(N-methylbenzimidazolyl)pyridine (bBzlMe:py) have been prepared and characterized by IR, electronic and 'H and '~C NMR spectral data. RhX(CO)2L, on treatment with alcoholic solvents or DMF undergoes reversible decarbonylation to produce RhXL" 2H20. Passage of NO or 02 through the carbonyl suspended in hot 2-methoxyethanol releases CO2. Copyright ¢~ 1997

Two new carbonyl complexes of rhodium, [Rh(CO) , bipy]ClO, and [Rh(CO) ,o-phen]ClO, have been prepared. EARLIER attempts to prepare 2,2 '-bipyridyl and o-phenanthroline carbonyl complexes of rhodium have yielded only the binuclear complex [Rh(CO) ,Cl],(bipy). Though the formation of some mononuclear complexes was also suspected such complexes were not actually iso1ated.l Two new carbonyl complexes of rhodium, [Rh(CO), bipyl-ClO, (I) and [Rh(CO),o-phenIC10, (11), have now been Compound8 [Rh(CO), bipylCl0,