Über das thermische Verhalten einiger Lithium‐und Natriumhexafluorometallate(IV)

Abstract

Aus Li2TiF6 wird durch Thermolyse Rutil gebildet, dagegen entsteht aus Na2TiF6 zuerst Brookit. Die Keimbildung der Produkte wird sowohl durch die gittergeometrisch ähnlichen Edukt‐Produkt‐Beziehungen als auch durch chemische Faktoren wie Fremdioneneinbau begünstigt. Das thermische Verhalten der Lithium‐ und Natriumhexafluorometallate mit Zentral atomen der IV. Hauptgruppe wird vegleichend betrachtet. Gitteraufweitungen und Phasenum wandlungen werden mit Hilfe der Heizguiniermethode bestimmt und die Differenzen zu Reaktionen größerer Mengen dargestellt. Ein γ‐Na2SnF6 mit Na2SiF6‐Struktur wird beschrieben.

Li2PbF6 and SrPbF6 Revisited

“…The distance between the Li and the F atom [2.057(5) Å], is in good agreement with those in other fluoridometallates(IV) (e.g. : Li 2 GeF 6 , 1.961–2.186 Å, ht modification, P 321, 293 K; Li 4 ZrF 8 , 1.841–2.256Å, Pnma , 298 K) , . The Pb–F distance [1.997(7) Å] is also in good agreement with previously reported data for metal(II) hexafluoridoplumbates(IV) M PbF 6 [ M = Mg (1.99 Å), Ni (1.99 Å), Zn (1.97 Å)] …”

“…: Li 2 GeF 6 , 1.961-2.186 Å, ht modification, P321, 293 K; Li 4 ZrF 8 , 1.841-2.256Å, Pnma, 298 K). [13,39] The Pb-F distance [1.997 (7) Å] is also in good agreement with previously reported data for metal(II) hexafluoridoplumbates(IV) MPbF 6 [M = Mg (1.99 Å), Ni (1.99 Å), Zn (1.97 Å)]. [2] The IR spectrum ( Figure S2, Supporting Infomation) shows a band at 475 cm -1 which is comparable with the band at approximately 500 cm -1 for the [PbF 6 ] 2anion in hydrated hexafluoridoplumbates(IV).…”

“…[13][14][15][16][17][18][19][20][21][22][23][24] The compounds M I 2 SnF 6 (M I = Li-Cs) are structurally characterized as well. [13,[25][26][27] For the stannates(IV), the crystal structures of the compounds M II SnF 6 (M II = Mg, Ca, determined the decomposition temperature of Li 2 PbF 6 . We also present the corrected space group and crystal structure for SrPbF 6 Sr, Ba, Mn, Fe, Co, Ni, Pd, Cu, Ag, Zn, Cd, Hg) were reported.…”

“…The crystal structures of the alkali metal hexafluoridosilicates(IV) and hexafluoridogermanates(IV) are also known for Li–Cs . The compounds M I 2 SnF 6 ( M I = Li–Cs) are structurally characterized as well , .…”

“…The crystal structures of the alkali metal hexafluoridosilicates(IV) and hexafluoridogermanates(IV) are also known for Li–Cs . The compounds M I 2 SnF 6 ( M I = Li–Cs) are structurally characterized as well , . For the stannates(IV), the crystal structures of the compounds M II SnF 6 ( M II = Mg, Ca, Sr, Ba, Mn, Fe, Co, Ni, Pd, Cu, Ag, Zn, Cd, Hg) were reported .…”