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Publication Type
Journal Article
Author, Analytic
Thompson, Marlon K.; Vutchkov, Mitko K.; Kahwa, Ishenkumba A.
Author Affiliation, Ana.
Department of Chemistry
Article Title
Cooperative process governing formation of small pentanuclear lanthanide(III) nanoclusters and energy transport within and between them
Medium Designator
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Connective Phrase
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Journal Title
Inorganic Chemistry
Translated Title
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Reprint Status
Refereed
Date of Publication
2001
Volume ID
40
Issue ID
17
Page(s)
4332-41
Language
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Connective Phrase
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Location/URL
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ISSN
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Notes
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Abstract
Syntheses, lanthanide quantitative analyses, mass spectrometry and luminescence spectroscopy, and decay dynamics of crystals containing pentanuclear hetero-lanthanide(III) nanoclusters [(Lną5- xLnx)(NO3)6(”4-L)2] (0 Ł x Ł 5), Lną = Eu or Tb; Ln - Nd, Sm-Ho (hereafter Lną5- xLnx) were undertaken in search of information on factors governing self-assembly processes by which the clusters are formed and electronic interactions within and between them. The data obtained are consistent with the self-assembly of Lną5- xLnx nanoclusters being a concerted process featuring a profound expression of complementarity among mutually bridging [Ln(”4-L]- and [Ln(NO3)2]+ components. The energy transport regime in crystals of Eu5-xLnx is in the dynamic regime when x = 0 or Ln = La and, at 293 K, Ln = Dy, despite the presence of two crystallographically different Eu3+ coordination environments which give rise to a doublet in the excitation and emission spectra of Eu3+(5D0). The luminescence decay behavior of Eu3+(5D0) in Eu5-xLnx (Ln = Dy (for 77 K), Sm) is intermediate between the static and dynamic limits and reveals extensive electronic coupling among lanthanide ions, including many-body processes at relatively high Dy3+ or Sm3+ concentrations.....
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