• S Soundararajan

      Articles written in Journal of Chemical Sciences

    • Complexes of lanthanide nitrates with O,O′,N-triisopropyl phosphoramidate

      C Premlatha S Soundararajan

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      A substituted phosphoramidate has been used as a ligand to lanthanides for the first time. New complexes of lanthanide nitrates with O,O′,N-triisopropyl phosphoramidate (TIP) of the general formula Ln(TIP)3(NO3)3 where Ln=La-Yb and Y have been synthesised and characterised by chemical analysis, infrared and visible electronic spectra and electrical conductance.

      Infrared spectra indicate the coordination of the ligand to the metal ions through the oxygen of the P=O group. IR and conductance show that the nitrate groups are all coordinated. Electronic spectral shapes have been interpreted in terms of an eight coordinate geometry around the metal ions.

    • Lanthanide perchlorate complexes of 4-cyano pyridine-N-oxide, 4-chloro 2-picoline-N-oxide and 4-dimethyl amino-2-picoline-N-oxide

      N S Navaneetham S Soundararajan

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      Complexes of lanthanide perchlorates with 4-cyano pyridine-1-oxide, 4-chloro 2-picoline-1-oxide and 4-dimethyl-amino 2-picoline-1-oxide have been isolated for the first time and characterized by analysis, conductance, infrared, NMR and electronic spectra. The complexes of 4-cyano pyridine-1-oxides have the composition Ln(CyPO)6(ClO4)3. 2H2O (Ln=La, Sm, Dy and Ho); Ln(CyPO)7 (ClO4)3. 2H2O (Ln=Pr, Nd, Er and Yb); and Ln(CyPO)5 (ClO4)3. 2H2O (Ln=Gd and Tb). The complexes of 4-chloro 2-picoline-1-oxide analyse for the formulae Ln(CpicO)6 (ClO4)3 (Ln=La, Pr, Nd and Ho); and Ln (CpicO)5 (ClO4)3 (Ln=Er and Yb), and those of 4-dimethylamino 2-picoline-1-oxide for Ln(DMPicO)6 (ClO4)3 (Ln=La and Nd); Ln(DMPicO)7 (ClO4)3 (Ln=Gd, Er and Yb); and Ln(DMPicO)8 (ClO4)3 (Ln=Dy and Ho).

    • Hydration numbers of some metal acetates, monochloroacetates and trichloroacetates in solution from ultrasonic velocity and compressibility measurements

      D K Koppikar M V Lele S Soundararajan

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      Ultrasonic velocities in aqueous solutions of some metal acetates, monochloroacetates and trichloroacetates, and the respective acids have been measured at 1 MHz frequency using the pulse technique. The ultrasonic velocity, adiabatic compressibility and apparent molal compressibility were measured as a function of concentration. The apparent molal compressibility values at infinite dilution were calculated and used to determine the hydration numbers. The hydration numbers obtained are, CH3COOH(HP)=3·1, NiP2=15·0, CuP2=8·6, LaP3=18·3, PrP3=20·3, NdP3=16·5, ClCH2COOH(HQ)=3·5, NiQ2=14·0 CuQ2=7·6, MgQ2=9·3, CaQ2=9·4, BaQ2=17·5, LaQ3=19·5, PrQ3=18·5, NdQ3=18·0, YQ3=20·5, Cl3CCOOH(HR)=6·3, NiR2=11·5, CuR2=6·3, MgR2=8·8, CaR2=9·8, BaR2=13·0, LaR3=28·8, PrR3=30·0, NdR3=27·8 and YR3=31·3. The low hydration numbers obtained for most of the salts of divalent metal ions are probably due to incomplete dissociation in solution.

    • Lanthanide perchlorate complexes of quinoline-1-oxide and isoquinoline-2-oxide

      R Kalyanasundaram N S Navaneetham S Soundararajan

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      Complexes of lanthanide perchlorates with quinoline-1-oxide and isoquinoline-2-oxide, have been isolated for the first time and characterised by analysis, conductance, andir,nmr and electronic spectral studies. The complexes of quinoline-1-oxide have the composition Ln(QNO)8(ClO4)3 where Ln=La, Pr or Nd and Ln(QNO)7(ClO4)3 where Ln=Gd, Dy, Ho, Er or Yb. The isoquinoline-2-oxide complexes analyse for the formula Ln(IsoQNO)7(ClO4)3 where Ln=La−Yb.

    • Lanthanide perchlorate complexes of 2-acetamidopyridine-1-oxide

      N S Navaneetham R Kalyanasundaram N Rajasekar S Soundararajan

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      2-acetamidopyridine-1-oxide (AcAmPyO) complexes of six lanthanide perchlorates, with the general composition Ln(AcAmPyO)5 (ClO4)3, have been synthesized and characterized by analysis, molar conductance, infrared, proton NMR and electronic spectral data. Infrared and conductance studies indicate the ionic nature of the anion. The coordination of the ligand through the N-O and C=O moieties is shown by the infrared and proton NMR spectral analysis.

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