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- W2007889715 abstract "At the dissolution of anhydrous bismuth(III) trifluoromethanesulfonate in N,N-dimethylthioformamide (DMTF) a deep red-orange complex, λmax = 457 nm, is formed. Bismuth(III) is reduced by the solvent to a low-valent oxidation state stabilized by the sulfur-coordinating solvent DMTF. The obtained complex is weakly solvated seen by a low EXAFS amplitude and a slightly higher absorption energy of the LIII edge than of the DMTF-solvated bismuth(III) ion. The EXAFS data reveal a dimeric bismuth complex solvated by a single DMTF molecule, which sulfur atom bridges the bismuth atoms. The Bi−S bond distance is 2.543(2) Å, and the Bi···Bi distance is 3.929(7) Å giving a Bi−S−Bi angle of 101.2(4)°. The very low number of coordinated solvent molecule shows that the lone electron pairs of the reduced bismuth ions are stereochemically active. Cyclic voltammetry investigations provide evidence that at least one bismuth atom in the dimer exists in an oxidation state lower than +III, seen by two peaks at approximately −0.36 and −0.57 V in the reduction half-cycle. The absence of EPR signals excludes the presence of bismuth(II) radicals." @default.
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- W2007889715 date "2004-09-28" @default.
- W2007889715 modified "2023-10-17" @default.
- W2007889715 title "Stabilization of a Subvalent Oxidation State of Bismuth in <i>N,N</i>-Dimethylthioformamide Solution: An EXAFS, UV−Vis, IR, and Cyclic Voltammetry Study" @default.
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- W2007889715 doi "https://doi.org/10.1021/ic0400787" @default.
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