• Title/Summary/Keyword: Lanthanide

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Studies on the Effect of Picolines on the Stereochemistry of Lanthanide(III) Nitrate Coordination Compounds of 4[N-Furfural)amino]antipyrine Semicarbazone and Antibacterial Activities (4[N-Furfural)amino]antipyrine Semicarbazone의 질산 란탄(III) 배위화합물의 입체화학에 미치는 Picolines의 영향과 항박테리아 활성)

  • Agarwal, Ram K.;Agarwal, Himanshu;Prasad, Surendra;Kumar, Anil
    • Journal of the Korean Chemical Society
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    • v.55 no.4
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    • pp.594-602
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    • 2011

  • The effect of ${\alpha}$-, ${\beta}$- and ${\gamma}$-picolines on the stereochemistry of the coordination compounds of lanthanide(III) nitrates derived from 4[N-(furfural)amino]antipyrine semicarbazone (FFAAPS) has been studied. The general composition of the present coordination compounds is [Ln(FFAAPS)$(NO_3)_3$Pic] (Ln=La, Pr, Nd, Sm, Gd, Tb, Dy or Ho and Pic=${\alpha}$-, ${\beta}$- or ${\gamma}$-picolines). All these coordination compounds have been characterized by elemental analyses, molecular weight, molar conductance, magnetic susceptibility, infrared and electronic spectra. The infrared studies suggest that the FFAAPS behaves as a neutral tridentate ligand with N, N, O donor while ${\alpha}$-, ${\beta}$- or ${\gamma}$-picoline is coordinated to the lanthanide(III) ions via heterocyclic N-atom. Nitrates are bicovalently bonded in these compounds. From the electronic spectral data, nephelauxetic effect (${\beta}$), covalence factor ($b^{1/2}$), Sinha parameter (${\delta}%$) and the covalence angular overlap parameter (${\eta}$) have been calculated. Thermal stabilities of these complexes have been studied by thermogravimetric analysis. The coordination number of lanthanide(III) ions in the present compound is found to be ten. The antibacterial studies screening of the primary ligand FFAAPS and the complexes showed that the present complexes have moderate antibacterial activities.

  • https://doi.org/10.5012/jkcs.2011.55.4.594 인용 PDF KSCI KPUBS HTML

Sensitized Near IR Luminescence of Er(Ⅲ) Ion in Lanthanide Complexes Based on Diketone Derivatives: Synthesis and Photophysical Behaviors

  • Baek, Nam-Seob;Kwak, Bong-Kyu;Kim, Yong-Hee;Kim, Hwan-Kyu
    • Bulletin of the Korean Chemical Society
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    • v.28 no.8
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    • pp.1256-1260
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    • 2007

  • Two β-diketone derivatives bearing triphenylene (1-naphthalene-2-yl-3-triphenylen-2-yl-propane-1,3-dione (NTPD)) and naphthalene (1,3-di-naphthalene-2-yl-propane-1,3-dione (DNPD)) and their Ln(III) complexes (Ln = Er or Gd) were synthesized and their photophysical properties were investigated. The sensitized emission of Er3+ ion in Er3+-[NTPD]3(terpy) and Er3+-[DNPD]3(terpy) was observed upon excitation at absorption maximum of ligands. Their photophysical studies indicate the sensitization of Er3+ luminescence by energy transfer through the excited triplet state of β-diketone ligand. The energy transfer rate through the excited triplet state of β-diketone ligand to Er3+ ion occurs faster than that of the oxygen quenching rate.

  • https://doi.org/10.5012/bkcs.2007.28.8.1256 인용 PDF KSCI

A Study on the Hypersensitive Transitions of Nd(III), Ho(III) and Er(III) Complexes in Aqueous Solution (수용액에서 몇가지 란탄 착화합물의 Hypersensitive Transition에 관한 연구)

  • Sock Sung Yun;Ki Young Choi;Kyoung Kyun Park
    • Journal of the Korean Chemical Society
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    • v.32 no.3
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    • pp.243-248
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    • 1988

  • The hypersensitive $f{\rightarrow}f$ transitions of Nd(III), Ho(III), and Er(III) have been studied for some lanthanide complexes in aqueous solution. Based on the linear correlation between the oscillator strength of the transition and the basicity$(pK_a)$ of the ligand, the covalency in the metal-ligand bonding is discussed for lanthanide anthranilate, pyrazine-2-carboxylate, and pyruvate.

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Determination of Individual Lanthanide Elements by Neutron Activation Using a New Comparator Technique

  • Lee, Chul;Yim, Yung-Chang;Chung, Koo-Soon
    • Nuclear Engineering and Technology
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    • v.4 no.2
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    • pp.83-89
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    • 1972

  • The contents of the individual lanthanide elements are determined by neutron activation using a new comparator technique, which employs the short-lived radio-isotope of 56Mn as a neutron flux monitor. The total rare earths are separated as a group from the monazite sample before irradiation. After irradiation the rare earths are separated from each other by gradient elution with ammonium alpha-hydroxyisobutyrate using a cation-exchange column. The contents of 14 individual rare earths, from lutetium to lanthanum, are deter-mined.

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