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Title: Investigation of the neutron activation of endohedral rare earth metallofullerenes

Abstract

Endohedral lanthanide metallofullerenes and their water-soluble biocompatible derivatives have been synthesized. The effect that fast-neutron irradiation has on the stability and nuclear physical properties of endohedral metallofullerenes that are used as magnetocontrast materials ({sup 46}Sc, {sup 140}La, {sup 141}Nd, {sup 153}Sm, {sup 152}Eu, {sup 154}Eu, {sup 153}Sm, {sup 160}Tb, {sup 169}Yb, {sup 170}Tm (isomers I and III), and {sup 177}Lu) is studied. Our hypothesis, according to which carbon-shell relaxation is based on the fast nonradiative processes of an electron shake-off type, is confirmed.

Authors:
; ; ; ; ; ;  [1]
  1. Russian Academy of Sciences, St. Petersburg Nuclear Physics Institute (Russian Federation)
Publication Date:
OSTI Identifier:
22054217
Resource Type:
Journal Article
Resource Relation:
Journal Name: Crystallography Reports; Journal Volume: 56; Journal Issue: 7; Other Information: Copyright (c) 2011 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY AND NUCLEAR CHEMISTRY; CARBON; EUROPIUM 152; EUROPIUM 154; FAST NEUTRONS; IRRADIATION; ISOMERS; LANTHANUM 140; LUTETIUM 177; NEODYMIUM 141; NEUTRON ACTIVATION ANALYSIS; PHYSICAL PROPERTIES; RARE EARTH COMPLEXES; RELAXATION; SAMARIUM 153; SCANDIUM 46; STABILITY; TERBIUM 160; THULIUM 170; YTTERBIUM 169

Citation Formats

Shilin, V. A., E-mail: shilin@pnpi.spb.ru, Lebedev, V. T., Kolesnik, S. G., Kozlov, V. S., Grushko, Yu. S., Sedov, V. P., and Kukorenko, V. V. Investigation of the neutron activation of endohedral rare earth metallofullerenes. United States: N. p., 2011. Web. doi:10.1134/S1063774511070339.
Shilin, V. A., E-mail: shilin@pnpi.spb.ru, Lebedev, V. T., Kolesnik, S. G., Kozlov, V. S., Grushko, Yu. S., Sedov, V. P., & Kukorenko, V. V. Investigation of the neutron activation of endohedral rare earth metallofullerenes. United States. doi:10.1134/S1063774511070339.
Shilin, V. A., E-mail: shilin@pnpi.spb.ru, Lebedev, V. T., Kolesnik, S. G., Kozlov, V. S., Grushko, Yu. S., Sedov, V. P., and Kukorenko, V. V. 2011. "Investigation of the neutron activation of endohedral rare earth metallofullerenes". United States. doi:10.1134/S1063774511070339.
@article{osti_22054217,
title = {Investigation of the neutron activation of endohedral rare earth metallofullerenes},
author = {Shilin, V. A., E-mail: shilin@pnpi.spb.ru and Lebedev, V. T. and Kolesnik, S. G. and Kozlov, V. S. and Grushko, Yu. S. and Sedov, V. P. and Kukorenko, V. V.},
abstractNote = {Endohedral lanthanide metallofullerenes and their water-soluble biocompatible derivatives have been synthesized. The effect that fast-neutron irradiation has on the stability and nuclear physical properties of endohedral metallofullerenes that are used as magnetocontrast materials ({sup 46}Sc, {sup 140}La, {sup 141}Nd, {sup 153}Sm, {sup 152}Eu, {sup 154}Eu, {sup 153}Sm, {sup 160}Tb, {sup 169}Yb, {sup 170}Tm (isomers I and III), and {sup 177}Lu) is studied. Our hypothesis, according to which carbon-shell relaxation is based on the fast nonradiative processes of an electron shake-off type, is confirmed.},
doi = {10.1134/S1063774511070339},
journal = {Crystallography Reports},
number = 7,
volume = 56,
place = {United States},
year = 2011,
month =
}
  • A method is given for the quantithtive separation and determination of individual rare earth elements in minerals. The method utilizes ion-exchange chromatography (0.5 M ammonium lactate in pH = 3.50, 4.30, 87 deg C) and pile- neutron (lO/sup 1//sup 1/ n/cm/sup 2//sec) activation. The rare earths are extracted by the 5,7-dichloro-8-quinolinol method from each fraction and determined photometrically by the Neothorin method after destroying the organic reagent. Analyses of gadolinite, xenotime, fergusonite, euxenite, and yttrialite were carried out with precision. (auth)
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  • Isolation of the first macroscopic quantities of endohedral holmium metallofullerenes (principally Ho@C{sub 82}, Ho{sub 2}@C{sub 82}, and Ho{sub 3}@C{sub 82} by LD-TOF mass spectrometry) has been accomplished by carbon-arc and preparative HPLC methodologies. The detailed procedure for production and isolation of the metallofullerenes includes a new technique whereby holmium-impregnated electrodes are prepared simply by soaking porous graphite rods in an ethanolic solution of Ho(NO{sub 3}){sub 3}.xH{sub 2}O. Monoisotopic {sup 165}Ho offers a unique combination of advantages for neutron-activation studies of metallofullerenes, and purified samples containing {sup 165}Ho@C{sub 82}, {sup 165}Ho{sub 2}@C{sub 82}, and {sup 165}Ho{sub 3}@C{sub 82} have been activatedmore » by high-flux neutron irradiation ({Phi} = 4 x 10{sup 13}n cm{sup -2} s{sup -1}) to generate {sup 166}Ho metallofullerenes, which undergo {beta}{sup -} decay to produce stable {sup 166}Er. Chemical workup of the irradiated samples, followed by re-irradiation, has been used to demonstrate that observed decomposition of holmium metallofullerenes is due mainly to `fast` neutron damage rather than to holmium atom nuclear recoil (E{sub max} = 200 eV). This implies that metallofullerene damage can be minimized by using neutron fluxes with the highest possible thermal component. 60 refs., 4 figs.« less
  • Endohedral metallofullrenes are among the most fascinating materials to emerge from ongoing efforts to produce and characterize closed-cage carbon compounds. In this paper, we describe the use of a new tetraphenylporphyrin-silica support material for efficient HPLC purification of the metallofullerenes from crude soot extract. The true single-stage separation from pyridine extracts demonstrates the unique chemical selectivity exhibited by employing [pi]-electron-rich tetraphenylporphyrin-silica stationary phases in chemical purifications. 18 refs., 3 figs.