• Keine Ergebnisse gefunden

Ligand Redistribution Equilibria in Aqueous Fluoroberyllate Solutions Michael Schmidt, Hubert Schmidbaur

N/A
N/A
Protected

Academic year: 2022

Aktie "Ligand Redistribution Equilibria in Aqueous Fluoroberyllate Solutions Michael Schmidt, Hubert Schmidbaur "

Copied!
1
0
0

Wird geladen.... (Jetzt Volltext ansehen)

Volltext

(1)

Ligand Redistribution Equilibria in Aqueous Fluoroberyllate Solutions Michael Schmidt, Hubert Schmidbaur

Anorganisch-chemisches Institut der Technischen Universit¨at M¨unchen, Lichtenbergstrasse 4, D-85747 Garching, Germany

Z. Naturforsch.53 b,1294–1300 (1998); received July 17, 1998 Fluoroberyllates, Beryllium Fluoride, Ligand Redistribution, NMR Data

The composition of aqueous fluoroberyllate solutions has been studied by9Be and19F NMR spectroscopy for various ratios of the beryllium and fluorine concentrations, and at different pH values. The equilibrium constants have been determined for the ligand exchange processes, which involve the species [Be(OH2)4]2+, [BeF(OH2)3]+, [BeF2(OH2)2], [BeF3(OH2)] , and [BeF4]2 . These equilibria are shifted towards [BeF4]2 at high pH. No polynuclear fluo- roberyllates have been detected. The fluoride exchange between the individual species is slow on the NMR time scale at room temperature, and separate sharp signals with the expected multiplicity are therefore recorded. Calculated9Be chemical shifts are in good agreement with experimental data.

* Reprint requests to Prof. Dr. H. Schmidbaur.

Referenzen

ÄHNLICHE DOKUMENTE

However, when areas like heterosiloxanes in silicon chemistry, ylides in phosphorus chemistry, or the role of magnesium and beryllium in bioinorganic chemistry, were on the agenda,

To observe the effect of Pb 2+ on the CaCO 3 nucleation, a contour plot with the critical supersaturation of calcite (Figure 7A) is calculated from the onset of the CaISE

Abstract: We investigate the relation between the spectral sets (i. e., the sets of eigen- values, disregarding multiplicities) of two d-dimensional networks popular in

[r]

This important feature has also been shown meanwhile by direct measurements of the conductance of highly dilute solutions with propylene carbonate [30] and further aprotic and

3 A pure-strategy revealed-preference Nash-equilibrium ( rpne ) of the simultaneous game then is a contribution profile in which each player chooses a contribution in line with

8 In combination with the effects of a ⋃ -shaped e-i curve or corresponding effects in a more general equivalence scale specification, this trend has caused a procedure that have

The serles are successfully approximated by Pearson three-type theoretical curves, leading to t h e results shown in Table 1... number of observation