Über Chalkogenolate. 187. Untersuchungen über Salze der Pyruvinsäure 2. Kristallstruktur von Kaliumpyruvat, Neubestimmung der Struktur von Natriumpyruvat

Abstract

Die Titelverbindungen M[O2CCO;CH3] mit M = Na, K kristallisieren monoklin mit Z = 4 in der Raumgruppe P21/n; Na[O2CCOCH3] a = 21, 905(3) Å, K[O2CCOCH3] a = 22,027(2) Å, b = 5,269(1) Å, b = 5,835(2) Å, c = 3,671(1) Å, c = 4,004(4) Å, β = 91,34(2)°. β = 90,88(3)°. Für die Na+‐bzw. K+‐Verbindung wurde die Struktur aus bei 20°C vermessenen röntgenographischen Einkristalldaten unter Verwendung von 1065 bzw. 1308 symmetrieunabhängigen Reflexen bestimmt und bis auf Gütefaktoren von R = 0,051 bzw. 0,055 und Rw = 0,055 bzw. 0,057 verfeinert. Beide Verbindungen sind isostrukturell. Das jeweilige Alkalimetallion ist von sieben O‐Atomen, die von fünf verschiedenen Anionen stammen, unregelmäßig koordiniert.

Double-Quantum Filtration under Rotational-Resonance Conditions: Numerical Simulations and Experimental Results

“…1): different 13 C isotopomers of sodium pyruvate, 1, provide isolated two-and three- 13 C-spin systems, while L-tyrosine-ethylester, 2, in its fully 13 C-enriched form (2-U 13 C) provides a realistic testing ground for the performance in true multiple- 13 C-spin systems. The crystal structures of 1 (16) and 2 (17) are known.…”

Crystal structure of poly[μ-acetato-bis[μ-2-oxo-2-(quinolin-8-yl)ethanoato]trisodium]

“…Ethyl 2-oxo-2-(quinolin-8yl)ethanoate was prepared by a literature procedure (Crespo-Peñ a et al, 2012) and then hydrolysed under basic conditions to yield the title compound. For sodium salts of keto-acids, see; Lis & Matuszewski (1984); Jain et al (1969); Tavale et al (1961Tavale et al ( , 1964; Rach et al (1988). A similar NaÁ Á ÁC N(quinoline) interaction is observed in a previously published samarium Schiff base complex (Li et al, 2008…”

Vibrational spectra and normal coordinate analysis of lithium pyruvate monohydrate and its isotopic compounds

“…However, the single crystals used in the analysis (triclinic, P ī (Ci 1 ), a = 5.31 (7) were not good in quality for the precise analysis. The preparation of the good single crystals of this compound seems to be difficult, as suggested by Rach et al [45]. Although no small values of R have been obtained, the structure is roughly as follows: the skeletal frame has Cs symmetry approximately, where the C-COO − moiety is nearly planar and almost perpendicular to the C-C-C plane and bisected by the latter plane.…”