ChemInform Abstract: Crystal Structure of K₂[C₂O₆] — First Proof of Existence and Constitution of a Peroxodicarbonate Ion.

Abstract

Crystal Structure of K 2 [C 2 O 6 ] -First Proof of Existence and Constitution of a Peroxodicarbonate Ion.-Light blue powder of the title compound is synthesized by anodic oxidation of a saturated aqueous solution of K 2 CO 3 at -20 • C. As revealed by powder XRD, K 2 [C 2 O 6 ] crystallizes in the monoclinic space group P2 1 /c with Z = 4 and contains the fully deprotonated peroxodicarbonate anion. The anion has nearly C 2 symmetry and consists of two carbonate groups which are linked by two of the oxygen atoms that form a peroxo bridge. The crystal structure is based on a three-dimensional framework of KO 7 polyhedra interconnected by carbonate groups.

Enabling Atomic‐Scale Imaging of Sensitive Potassium Metal and Related Solid Electrolyte Interphases Using Ultralow‐Dose Cryo‐TEM

“…Two representative regions (region 1 and 2, marked by yellow and red circles in Figure a) are presented to demonstrate the spatial and chemical features (Figure 4b,e). In Figure 4c region 1, inorganic KCO 3 crystal [ 36 ] (with (202) d ‐spacing 3.21 Å) is found in the SEI in KFSI‐TEP/2 wt% VC, which is adjacent to a large area of K 2 O (Figure 4d) and a small area of KO 2 (Figure S3, Supporting Information). Meanwhile, KCO 3 overlaps slightly with both K 2 O and KO 2 .…”

Amine Oxidation by Electrochemically Generated Peroxodicarbonate

“…Nowadays, this term is used for an adduct of sodium carbonate and hydrogen peroxide (Na 2 CO 3 ·1.5H 2 O 2 ), synthesized by Tanatar in 1899. 13 The crystal structure of potassium peroxodicarbonate, with its central peroxide moiety, was determined by Jansen and co-workers in 2002 by using high-resolution X-ray powder diffraction, 14 proving that von Hansen’s peroxodicarbonate and Tanatar’s percarbonate are clearly two different species. The accessibility of peroxodicarbonate has recently been greatly improved by the use of boron-doped diamond (BDD) anodes in flow-through electrolysis cells.…”

Prediction and characterization of novel polynuclear superalkali cations

“…S3, † the NBO charges on the C 2 O 4 unit are in the range of −1.715 to −1.775 for the C 2 O 4 Li The anion C 2 O 6 2− can be obtained by electrolysis of a saturated solution of rubidium carbonate in water, 32 and its crystal structure was determined only in 2002. 33 In both salts, each of the two carbonate units is planar. In the rubidium salt the whole molecule is planar, whereas in the potassium salt the two units lie on different and nearly perpendicular planes, both of which contain the O-O bond.…”