60897-63-4Relevant academic research and scientific papers
About the new mixed valent Ge7F16: [GeF6]2- octahedra between [Ge6F10]2+ sheets - A contribution to the stereochemical activity of lone pairs
Koehler,Chang
, p. 596 - 602 (2008/10/09)
For the first time Ge7F16 colourless transparent single crystals have been prepared by the reduction of GeF4 with Ge at 300°C. The extremely hygroscopic fluoride crystallizes in a new structure type in Cc with a = 1818.0(6) pm, b = 754.3(2) pm, c = 1030.4(3) pm, β = 90.33(3)° und Z = 4. Ge7F16 is a mixed valent fluoride according to 6GeF2×GeF4. Characteristical building units of the new structure type are [Ge6F10]2+ sheets, which are connected via [GeF6]2- octahedra. The Ge2+ within the sheets are coordinated by three nearest F- with distances of 183-218 pm and together with these form distorted trigonal pyramids. The structure of Ge7F16 can be considered as a member of the homologues series Gem4+Gen2+F4m+2n with m = 1 and n = 6. Bond order summations, band structure calculations and calculations of the Madelung part of the lattice energy, MAPLE, have been used for the discussion of the bonding situation.
Crystal Structure of GeF//4.
Koehler, J.,Simon, A.,Hoppe, R.
, p. 333 - 341 (2008/10/08)
GeF//4 has been prepared by heating BaGeF//6 at 600 degree C under a pressure of 10** minus **3 Torr and has been solidified by cooling with liquid nitrogen in a quartz ampoule. A small amount was sealed in a quartz capillary and it was shown that a single crystal could be grown from the gas phase on a four-circle diffractometer at minus 30 degree C. The crystal structure and the calculated Madelung part of lattice energy (MAPLE) are discussed.
