By Gert Heller (auth.), Jürgen Faust, Kurt Niedenzu (eds.)
The current factor, quantity 2 of "Boron Compounds" 4th complement of the Gmelin Hand booklet, updates the former matters by way of reporting the literature on boron-oxygen platforms released as much as 1988. For a few very important fresh advancements literature is roofed via mid-1992; this matters, for instance, the compounds ~-Ba3[B306h and U[B305J which grew to become of curiosity as fabrics with nonlinear optical homes. the amount without delay com plements the sooner "Boron Compounds" third complement quantity 2. within the unique literature, replacement formulations are usually used for a similar com pound. this is often very true for lots of borates. frequently, those species are neither thoroughly heteropolar nor covalent, and an experimentally established selection has now not been made. therefore, using brackets doesn't inevitably mirror a very salt-like personality. quantity 1 (systems with hydrogen and noble gases) of this actual complement could be released for this reason, while quantity 3a (boron and nitrogen), quantity 3b (boron and nitrogen, boron and fluorine), and quantity four (boron compounds containing Cl, Br, I, S, Se, and Te, in addition to a piece containing carboranes) have already been released. All volumes of the 4th complement can be augmented via a formulation index. The IUPAC nomenclature is usually adhered to; thf skill tetrahydrofuran; and occa sionally extra abbreviations for compounds are defined within the textual content. optimistic symptoms for chemical shifts of the NMR signs exhibits downfield shifts from the references, frequently inner (CH3)4Si for olH and 013C with others being specified.
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Extra info for B Boron Compounds: 4th Supplement Volume 2, Boron and Oxygen
Molecular dynamics (MD) calculations for sodium borate glasses using the interionic potentials derived by MD calculations of crystals show that the composition dependence of the fraction of 80 4 is in good agreement with NMR measurements. The pair distributions and bond angle distributions around 803 and 80 4 showed remarkable differences from each other and resulted in the particular local structures. The network is developed initially with an increase of Na20 content and the maximum development is shown to occur near 33 mol% Na20.
The role of the F- ion in 8 2 0 3-Na 2 0-NaF glasses was studied by various spectroscopic techniques. Raman, mid-infrared, and UV spectral data provided evidence that F- participates in the borate network by forming covalent 8-F bonds. The far-infrared spectra demonstrated that F- induces the creation of high potential energy network sites with strong cation-network interactions. The implication of these phenomena on the electric conduction properties is discussed . 5 has been studied by Raman and Fourier transform infrared (FTIR) spectroscopy.
Comparison of the caLcuLated miscibility dome with that observed for aLkali metaL borates suggests that there is a strong association between two non bridging oxygen atoms and two aLkali metaL ions at temperatures where phase separation is observed. The effect of temperature on the fraction of tetrahedraL 80 4 units (N 4) in aLkali metaL borate gLasses is predicted . CaLcuLated vaLues of N4 are in good agreement with quenching experiments, that show the correctness of the modeL of JeLlison and 8ray , describing the effect that the diborate group is energeticaLLy stabilized by the 80 4 tetrahedra .
B Boron Compounds: 4th Supplement Volume 2, Boron and Oxygen by Gert Heller (auth.), Jürgen Faust, Kurt Niedenzu (eds.)