[en] The azimuthal angle distribution and the charge and energy spectra of selected light-heavy (3 less than or = Z less than or = 8) stopping particles were measured in a single layer of CR-39 plastic nuclear track detector (PNTD) from the stack of the A0015 experiment located on the Earth-end of the satellite. The directional incidence of the trapped protons is studied by comparing the azimuthal angle distribution of selected recoils, obtained in the LDEF detectors, to that obtained through calibrations of PNTDs with exposure performed with 200 MeV proton beams from different directions. Similar measurements will be performed in a CR-39 sample exposed on the space-end of the LDEF satellite for intercomparison. The experimental results will also be compared to theoretical calculations

[en] New complexes of lanthanide perchlorates with the hydrazine derived ligand. N-acetyl-N'-benzoyl hydrazine (ABHyd) and N-acetyl-N'-isopropylidene hydrazine (NANIH), have been prepared and characterized by chemical analysis, infrared and electronic spectra and electrical conductance data. From the analytical data, the five complexes have the formulae Ln (ABHyd)₄(ClO₄)₃ where Ln = La, Pr, Nd, Ho and Er. Complexes of NANIH are found to have the stoichiometry Ln(NANIH)₅(ClO₄)₃ where Ln = La and Nd and Ln(NANIH)₄(ClO₄)₃ for Ln = Sm, Er and Y. Infrared and conductance indicate the noncoordinated nature of all the anions in all the complexes of ABHyd and NANIH. IR data further indicate the bidentate nature of both the ligands, the donor atoms being nitrogen and oxygen in NANIH and two oxygen atoms in ABHyd. (author)

[en] Complexes of lanthanide iodides with 4-methylpyridine-1-oxide and 2-methylpyridine-1-oxide of the formulae Ln(4-MePyO)₈I₃.xH₂O (x=0 or 2) and Ln(2-MePyO)₅I₃.xH₂O (x=0, 1 or 3) have been prepared and characterized by analyses, conductance, infrared and proton NMR data. Infrared spectra of the complexes indicate that the coordination of the ligand to the metal ion takes place through the oxygen of the N-O group of the ligand. Proton NMR data for the paramagnetic complexes indicate that both contact and pseudocontact interactions are responsible for the isotropic shifts. Proton NMR spectra of the 2-methylpyridine-1-oxide complexes indicate a restricted rotation of the ligand about the N-O group. (author)

[en] Adducts of lanthanide perchlorates with 4-nitro and 4-chloro pyridine-N-oxides (4-NPNO and 4-CPNO respectively) have been synthesised for the first time and characterised by analysis, electrolytic conductance, infrared, proton-NMR and electronic spectral data. The complexes are of the compositions Ln₂(NPNO)₁₅(ClO₄)₆(Ln = La, Pr, Nd and Gd), Tb(NPNO)₇(ClO₄)₃, Ln₂(NPNO)₁₃(ClO₄)₆(Ln = Dy, Ho and Yb); Ln(CPNO)₈(ClO₄)₃(Ln=La, Pr, Tb, Nd, Dy, Ho and Yb) and Ln(CPNO)₇(ClO₄)₃ (Ln = Sm and Gd). Conductivity and IR data provide evidence for the non-coordinated nature of the perchlorate groups. IR and NMR spectra suo.gest coordination via the oxygen of the N-oxide group. Electronic spectral shapes of the Nd⁺³ and HO⁺³ complexes are interpreted in terms of eight and seven coordinate environments in the case of 4-NPNO complexes and eight coordination in the case of 4-CPNO complexes. IR data indicate bridged structure in NPNO complexes of lanthanides other than Tb. (auth.)

[en] Two series of complexes of meconic acid (H₃Mec) with rare-earths have been prepared by varying the preparative procedure. The compounds have the general formulae, [Ln(Mec) (H₂O)₂].3 H₂O (where Ln = La, Ce, Pr, Nd, Sm, Ho and Y) and [Ln(HMec) (H₂Mec) (H₂O)₂].4 H₂O (where Ln = La, Pr, Nd and Sm). The infrared spectral data indicate that the carboxylate groups are bound to the rare-earth metal in a bidentate fashion. Thermal studies indicate that two water molecules are coordinated in each case. The complexes are probably polymeric. (author)

[en] New complexes of lanthanide nitrates with 2-N-(6-picolyl) benzamide of the formulae Ln₂(6-pic-BA)₃(NO₃)₆ (Ln-Y and La-Yb) have been prepared and characterised by chemical analysis, infrared, molar conductance and electronic spectral data. Molar conductance data along with IR data point to the presence of co-ordinated nitrate groups. IR spectra prove the bidentate co-ordination of the ligand to the metal ion, through the oxygen of the secondary amide and the nitrogen of the heterocyclic ring. Electronic spectral studies in the visible region suggest an eight co-ordinate geometry around the metal ions. (author)

[en] 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. (auth.)

[en] Complexes of lanthanide nitrates with 2-methylpyridine-1-oxide of the formula Ln(2-MePyO)₃(NO₃)₃ where Ln=Nd, Sm, Tb, Dy and Yb and La(2-MePyO)₃(NO₃)₃ x 2 H₂O have been prepared and characterized by chemical analyses, IR spectral, conductance and DTA data. IR spectral data have been interpreted in terms of the coordination of the ligand to the metal through the oxygen of the N-O group. Conductance and IR spectral data show that all the nitrate groups are bidentate and that two of the nitrate groups are bound to the metal in a different manner than the other. (author)

[en] 2,6-Lutidine-N-oxide (LNO) complexes of rare-earth bromides of the composition MBr₃.(LNO)sub(4-n).nHsub(2)O where n=1 for M=La, Pr, Nd, Sm, Gd, Ho, Er; and n=0 for M=Y have been prepared and characterised by analyses, conductance and infrared data. Infrared spectra of the complexes indicate that the coordination of ligand to the metal ion takes place through the oxygen of the ligand, and the water molecule in the complexes present is coordinated to the metal. A coordination number of seven has been suggested to all the rare-earth metal ions. (author)

[en] Dithiodiacetates of the rare-earths of the general formula MH(DTDA)₂ 2H₂0, where M=La, Ce, Pr, Nd, Sm, Ho, and Y, and H₂DTDA=dithiodiacetic acid, have been prepared and characterised by analyses, i.r. and differential thermal analysis. The i.r. data show that the bonding of the carboxylate group to the metal ion is bidentate. The i.r. and DTA studies reveal the presence of one water molecule in the coordination sphere. A coordination number of nine is suggested for the rare-earth metal ion in these compounds. (author)