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A series of binary complexes of Zn(II), Hg(II), Pb(II), La(III), Ce(III), Th(IV) and UO2(II) with 3,5-dinitrosalicylic acid and 5-sulphosalicylic acid have been isolated and characterized. The solution equilibria of these complexes have been studied pH-metrically. The formation constants (log K) at 25±1°C and ionic strength of 0.2M NaClC4 have been calculated. Stability of the complexes formed in relation to ligand molecular structure and nature of the metal ion has been examined and discussed. 相似文献
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Abdel-Latif S. A. El-Roudi O. M. Mohamed M. G. K. 《Journal of Thermal Analysis and Calorimetry》2003,73(3):939-950
Infrared (IR), nuclear magnetic resonance (NMR), thermogravimetric analysis (TG), derivative thermogravimetric analysis (DTG),
differential thermal analysis (DTA) and molar conductivity studies have been carried out on the chelates of Mn(II), Co(II),
Ni(II), Cu(II) and Zn(II) with 3-methyl- and 3-phenyl-4-nitroso-5-pyrazolones. The solid chelates were synthesized, separated,
analyzed and their structures were elucidated. The data obtained show that almost all of the prepared chelates contain water
molecules in their coordination sphere. The initial stage in the thermal decomposition process of these chelates shows the
presence of water molecule, the second denotes to the intermediate products. The final decomposition products were found to
be the respective metal oxides. The NMR spectrum of 3-methyl-4-nitroso-5-pyrazolone ligand shows the existence of the oxime
rather than the nitroso form. 3-phenyl-4-nitroso-5-pyrazolone acts as a neutral bidentate ligand whereas 3-methyl-4-nitroso-5-pyrazolone
acts as monobasic bidentate ligand bonded to the metal ions through the two oxygen atoms of the carbonyl and nitroso groups.
The solid chelates prepared behave as non-electrolytes in DMF solution. The coordination numbers of the obtained chelates
using 3-methyl-4-nitroso-5-pyrazolone are four on applying the mole ratio 1:1 and six on using 1:2 mole ratio. In case of
using the ligand 3-phenyl-4-nitroso-5-pyrazolone the coordination number is six in both cases.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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The oxine method after oxygen flask combustion was extended for the microdetermination of neodymium, praseodymium, samarium, and yttrium in their organometallic compounds. The metal content is determined gravimetrically (Method I) and volumetrically (Methods II and III) using a single sample weight. The method has the advantage of a favorable gravimetric factor, besides a sufficiently sharp endpoint with 12-fold amplification reaction in case of titrimetric finish. The average percent error for the determination is ±0.07, ±0.06, and ±0.07 for Methods I, II, and III, respectively. 相似文献
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