- Spin-crossover behavior in cyanide-bridged iron(ii)-copper(i) bimetallic 1-3D metal-organic frameworks
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The synthesis and characterization of a series of 1-3D cyanide-bridged iron(II)-copper(I) bimetallic coordination polymers formulated as {Fe(3-Xpy)2[Cu(3-Xpy)z(CN)2]2}, where 3-Xpy is a 3-halogenpyridine ligand
- Agusti, Gloria,Munoz, M. Carmen,Gaspar, Ana B.,Real, Jose A.
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- Solvent dependent tunable energy transfer of d10 metal dicyanide nanoclusters with Eu3+ and Tb3+ rare earth ions
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The luminescence energy and intensity of d10 copper(I), silver(I) and gold(I) dicyanide nanoclusters exhibit high tunability as energy transfer donors in different organic solvents. For Tb3+ acceptor ions, the energy transfer efficiency, which is proportional to the spectral overlap between the donor emission and the acceptor absorption, depends on the solvent tunability of the donor emission energy. For Eu3+ acceptor ions, energy transfer can be 'tuned off' or 'tuned on' as the solvent dependent donor emission energy becomes in resonance with a charge transfer state or with the 5L6 Eu3+ ion state, respectively.
- Guo, Zhonghua,Yson, Renante L.,Patterson, Howard H.
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- A multinuclear magnetic resonance study of crystalline tripotassium tetracyanocuprate
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Direct NMR observation of copper-63/65 nuclei in solid K3Cu(CN)4 provides the first experimental example of anisotropic copper chemical shielding. Axially symmetric by virtue of the space group symmetry, the shielding tensor spans 42 ppm, with the greatest shielding when the unique axis is perpendicular to the applied magnetic field. The nuclear quadrupole coupling constant is also appreciable, CQ(63Cu) = -1.125 MHz, reflecting a deviation of the Cu(CN)43- anion from pure tetrahedral symmetry. Spin-spin coupling to 13C nuclei in an isotopically enriched sample is quantified by line-shape simulations of both 13C and 63/65Cu magic-angle spinning (MAS) NMR spectra to be 300 Hz. It is shown that this information is also directly available by 63/65Cu triple-quantum (3Q) MAS NMR. The relative merits of these three approaches to characterizing spin-spin couplings involving half-integer quadrupolar nuclei are discussed. Chemical shielding tensors for nitrogen-15 and carbon-13 are obtained from NMR spectra of nonspinning samples, and are compared to those of tetrahedral group 12 tetracyanometallates. Finally, 2J(63/65Cu, 15N) detected in 15N MAS experiments are found to be 19 and 20 Hz for the two crystallographically distinct cyanide ligands.
- Kroeker, Scott,Wasylishen, Roderick E.
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p. 1962 - 1972
(2007/10/03)
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