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- W2048129265 abstract "A dimercury(I) 18-crown-6 complex is isolated, and its possible role in the hydrothermal preparation of the mercuric nitrite complex is discussed. The reported structures are of [Hg2(18-crown-6)2(H2O)2](ClO4)2 (1), monoclinic, C2/c, a = 21.0345(9), b = 12.1565(5), c = 16.8010(7) Å, β = 113.2000(10)°, V = 3948.7(3) Å3, Z = 16, R = 0.0230; [Hg(18-crown-6)](NO2)2 (2), monoclinic, P21/c, a = 8.027(5), b = 14.437(9), c = 7.827(5) Å, β = 95.165(11)°, V = 905.6(10) Å3, Z = 2, R = 0.0175. The complex cation in compound 1 consists of a mercurous dimer exhibiting a Hg−Hg bond length of 2.524(2) Å. Non-bonding interactions between adjacent crown ether macrocycles across the Hg−Hg bond result in large variations in mercury to oxygen distances within equatorial coordination sites. At low pH compound 1 is proposed to be preferentially formed under hydrothermal conditions affording compound 2 upon disproportionation. Nitrite ions ligate via a unidentate nitrito (cis to metal) coordination mode as interpreted using vibrational (infrared) spectroscopy. The conformation adopted by 18-crown-6 in compounds 1 and 2 is closely related to a D3d conformation as evidenced by X-ray crystallography. Band splitting readily observed in vibrational spectra of the metal free crown ether, attributed to vibrational modes of oxyethylene fragments, is absent in spectra of 1 and 2 confirming a regular D3d macrocyclic orientation. Short Hg−O bonds observed for axially coordinated water molecules in 1 and coordinated nitrite ligands in 2, illustrate the prevalence of relativistic effects commonly observed in mercury complexes." @default.
- W2048129265 created "2016-06-24" @default.
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- W2048129265 date "2009-11-24" @default.
- W2048129265 modified "2023-10-14" @default.
- W2048129265 title "Complexation of Mercury(I) and Mercury(II) by 18-Crown-6: Hydrothermal Synthesis of the Mercuric Nitrite Complex" @default.
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- W2048129265 doi "https://doi.org/10.1021/ic9017618" @default.
- W2048129265 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19928985" @default.
- W2048129265 hasPublicationYear "2009" @default.
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