Alkali metal cation complexation and solvent interactions by robust chromium(III) fluoride complexes
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Alkali metal cation complexation and solvent interactions by robust chromium(III) fluoride complexes. / Birk, T.; Magnussen, M.J.; Piligkos, Stergios; Weihe, H.; Holten, Anders; Bendix, J.
I: Journal of Fluorine Chemistry, Bind 131, Nr. 9, 2010, s. 898-906.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Alkali metal cation complexation and solvent interactions by robust chromium(III) fluoride complexes
AU - Birk, T.
AU - Magnussen, M.J.
AU - Piligkos, Stergios
AU - Weihe, H.
AU - Holten, Anders
AU - Bendix, J.
PY - 2010
Y1 - 2010
N2 - Interaction of robust chromium(III) fluoride complexes with sodium or lithium cations in solution lead to hypsochromic spectral shifts of increasing magnitude along the series: trans-[CrF2(py)(4)](+), mer-[CrF3(terpy)], and fac-[CrF3(Me(3)tacn)]. Crystalline products isolated from solution exhibit mu(2)-bridging by the fluoride ligands in a linear fashion between Na+-ions and chromium centres in catena-[Na(H2O)(4)(mu-F)-trans-{CrF(py)(4))](HCO3)(2) and in the dimers [Li(H2O)(n)(mu-F)-trans-{CrF(py)(4))}](2+) (n = 3, 4). The uncharged chromium complexes fac-[CrF3(Me(3)tacn)] and mer-[CrF3(terpy)] have been synthesized from mer-[CrF3(py)(3)] and shown to precipitate sodium salts from solution, of which 3[CrF3(Me(3-)tacn)]center dot 2Na(Bph(4)).solv and 6[CrF3(terpy)]center dot 4Na(Bph(4)).solv have been crystallographically characterized. In these clusters, the neutral fluoride complexes bring the Na+ cation separation down to 3.610 angstrom and 3.369 angstrom, respectively, which is much closer than the inter-cation distance in NaCl and comparable to that of NaF. DFT calculations support the notion of a strong interaction between Na+ ions and neutral chromium(III) fluoride complexes. The calculations reproduce the magnitude and the counter-intuitive sign of the spectral shifts induced by second sphere complexation in solution, which originates in a breakdown of the assumption of parameter transferability in ligand-field descriptions. (C) 2010 Elsevier B.V. All rights reserved
AB - Interaction of robust chromium(III) fluoride complexes with sodium or lithium cations in solution lead to hypsochromic spectral shifts of increasing magnitude along the series: trans-[CrF2(py)(4)](+), mer-[CrF3(terpy)], and fac-[CrF3(Me(3)tacn)]. Crystalline products isolated from solution exhibit mu(2)-bridging by the fluoride ligands in a linear fashion between Na+-ions and chromium centres in catena-[Na(H2O)(4)(mu-F)-trans-{CrF(py)(4))](HCO3)(2) and in the dimers [Li(H2O)(n)(mu-F)-trans-{CrF(py)(4))}](2+) (n = 3, 4). The uncharged chromium complexes fac-[CrF3(Me(3)tacn)] and mer-[CrF3(terpy)] have been synthesized from mer-[CrF3(py)(3)] and shown to precipitate sodium salts from solution, of which 3[CrF3(Me(3-)tacn)]center dot 2Na(Bph(4)).solv and 6[CrF3(terpy)]center dot 4Na(Bph(4)).solv have been crystallographically characterized. In these clusters, the neutral fluoride complexes bring the Na+ cation separation down to 3.610 angstrom and 3.369 angstrom, respectively, which is much closer than the inter-cation distance in NaCl and comparable to that of NaF. DFT calculations support the notion of a strong interaction between Na+ ions and neutral chromium(III) fluoride complexes. The calculations reproduce the magnitude and the counter-intuitive sign of the spectral shifts induced by second sphere complexation in solution, which originates in a breakdown of the assumption of parameter transferability in ligand-field descriptions. (C) 2010 Elsevier B.V. All rights reserved
KW - Bridging
KW - Cr(III)
KW - Robust
KW - Linear
KW - Chain
KW - FIELD ABSORPTION-BANDS
KW - RAY CRYSTAL-STRUCTURE
KW - NMR-SPECTRA
KW - SOLID-STATE
KW - ANIONS
KW - SOLVATOCHROMISM
KW - TITANIUM(III)
KW - PYRIDINE
KW - ENERGY
KW - APPROXIMATION
U2 - 10.1016/j.jfluchem.2010.06.003
DO - 10.1016/j.jfluchem.2010.06.003
M3 - Journal article
VL - 131
SP - 898
EP - 906
JO - Journal of Fluorine Chemistry
JF - Journal of Fluorine Chemistry
SN - 0022-1139
IS - 9
ER -
ID: 32648048