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Publication Type
Journal Article
Author, Analytic
Fairman, Richard A.,; Gallimore, Winklet, A.; Spence, Kirk V.N.; Kahwa, Ishenkumba A.
Author Affiliation, Ana.
Chemistry; Faculty of Pure and Applied Sciences
Article Title
Guest ion regognition and energy migration/transfer in a supramolecular cubic assembly of tetrakis (rubidium 18-crown-6) tetrachloromanganate (II) species
Medium Designator
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Connective Phrase
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Journal Title
Inorganic chemistry
Translated Title
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Reprint Status
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Date of Publication
1994
Volume ID
33
Issue ID
4
Page(s)
823-28
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
Competitive complexation of MCI42- ligands (M=Mn, Fe, Co, Ni, Cu, Zn) to yield cubic F23 [(Rb18C6)4-{(MnCl4)1-x(MCI4)x}][T1C14]2 complexes and the luminescence decay dynamics of the trapped [(Rb18C6)4MnV14)2+ species were studied. The results revealed sensitivity of the supramolecular cubic lattice to variations in the thermodynamic stability of Td MC142- anions. Extensive multipolar interactions along the [(Rb18C6)4MnC14]2+ sublattice are evident from facile donor-donor energy transfer. For [(A18C6)4MnC14][T1C14]2 (A = Rb, T1), energy migration terminates in thermalized ( 50 kJ mol-1) exciton trapping by water molecules, presumably present in [(A18C6)4-MnC14][T1C14]2.0.25H2O impurities. The thermal barrier is attributed to the dynamic reorientational motion of 18C6, which exhibits a similar thermal barrier. For [(Rb18C6)4{(MnC14)x}][T1C14]2 compounds, diffusive energy transfer from [(Rb18C6)4MnC14]2+ to [(Rb18C6)4CuC14]2+ traps dominates. Assuming dominant dipole dipole interactions, the Cu2+-Mn2+ and Mn2+-Mn2+ coupling constants are 2.4 X 10-52 M6s-1, respectively....
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