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Notizen 121 Bildung von D iam m onium dihydrogendiphosphat durch spontane K ondensation der A m idophosphorsäure in wäßriger Lösung Formation of Diphosphate from Amidophosphoric Acid in Aqueous Solution Fritz Seel* und Norbert Klein Fachrichtung Anorganische Chemie der Universität des Saarlandes, D-6600 Saarbrücken Z. Naturforsch. 39b, 121 — 122 (1984); eingegangen am 1. August 1983 Amidophosphoric Acid, Diphosphates A nearly saturated solution of amidophosphoric acid in water hydrolyses to yield diammonium diphosphate. This reaction provides a

ionizes as PFOA − substituting nitrate forming more stable metal complex [ 15 ]. In our previous work, a series of open-chain crown ether diphosphates modified with different length of ethylene oxide bridge and different ester side chains were developed and prepared [ 23 ], [ 24 ]. Rare earth metals were successfully extracted with these CO 2 -philic ligands. Open-chain crown ether provides measurable complexation [ 25 ] and the oxygen in the bridge could involve in the coordination resulting certain selectivity and metal complex stability. Suitable space for different

Abstract

Trisodium O-methyl, O-butyl, O-phenyl, and O-(4-nitrophenyl) diphosphates were synthesized from sodium dimethylamido-O-(2-cyanoethyl) phosphate and O-alkyl-and O-aryl phosphoric acids. While in the previously described method, sodium hydroxide was used for the preparation of O-phenyl diphosphate, in our current work, we present an improved protocol, where sodium methoxide is used to increase the yields of O-alkyl and O-aryl diphosphates. The structures of final compounds were determined by 1H NMR, 31P NMR, and IR spectroscopy. The sodium O-alkyl- and O-aryl diphosphate salts prepared by this method may be used for the study of biological activity of diphosphate analogues.

Crystal structure of new lanthanide diphosphates KLnP2O7 2 H2O (Ln¼ Gd, Tb, Yb) Aziz A. TahiriI, Brahim El BaliI, Mohammed LachkarI, Juan F. PiniellaII and Francesco Capitelli*, III I Départment de Chimie, Faculté des Sciences Dhar Mehraz, BP 1796 Atlas, 30000 Fès, Morocco II Department of Geology, Universitat Autònoma de Barcelona, Campus Universitari UAB, 08193 Bellaterra, Spain III Institute of Crystallography (IC-CNR), Via Amendola 122/o, 70126 Bari, Italy Received May 19, 2005; accepted July 4, 2005 Lanthanide diphosphates / Hydrogen bond / X

Two isostructural manganese(III) diphosphates, acid a-MnHP2O7 and double MnLiP2O7: crystal structure determination from X-ray powder diffraction data Ludmila S. Ivashkevich*, Kirill A. Selevich, Anatoly I. Lesnikovich, Anatoly F. Selevich and Alexander S. Lyakhov Physico-Chemical Research Institute of Belarusian State University, Leningradskaya 14, Minsk, 220050, Belarus Received May 9, 2005; accepted June 21, 2005 Diphosphates / Powder diffraction structure analysis / X-ray diffraction Abstract. Ab initio crystal structure determination of the a form of MnHP2O7

Crystal structure and properties of L-arginine diphosphate S. Haussühl*, I, H. A. KarapetyanII and A. M. PetrosyanIII I Institut für Kristallographie, Universität zu Köln, Zülpicherstr. 49b, D-50674 Köln, Germany II Molecule Structure Research Center, NAS of Armenia, Azatutyan Ave., 26, Yerevan, 375014, Armenia III Yerevan State University, Alex Manoogian St. 1, Yerevan 375049, Armenia Received July 30, 2002; accepted January 22, 2003 Abstract. Single crystals of L-arginine diphosphate (L- HN:C(NH2)NH(CH2)3CH(NH2)COOH 2 H3PO4, abbre- viated as LADP) with

Properties of Ribulose Diphosphate Carboxylase/Oxygenase in the Tobacco Aurea Mutant Su/su var. Aurea Keiichiro Okabe Max-Planck-Institut für Züchtungsforschung (Erwin-Baur-Institut), Abteilung Straub, Köln-Vogelsang (Z. Naturforsch. 32 c, 7 8 1 -7 8 5 [1977] ; received August 22, 1977) Photorespiration, Ribulose 1,5-diphosphate-Carboxylase/Oxygenase, Gene Composition The activity of ribulose 1,5-diphosphate (RuDP)-carboxylase and RuDP-oxygenase was measured in crude leaf extracts of the tobacco (N . tabacum ) phenotypes which differed with respect to their

zirconium diphosphate surface and its effect on uranium (VI) behavior. The authors found that the interaction between uranium and zirconium diphosphate surface in the presence of simple organic ligands, leads to the formation of ternary surface complexes. In order to make progress in the understanding of interactions between simple organic acids and phosphate mineral surfaces, the present work aims to investigate the interaction of salicylic acid on zirconium diphosphate surface and its reactivity facing uranium (VI). Salicylic acid is structurally similar to aromatic

The Herbicide Command Does Not Inhibit the Prenyl Diphosphate-Forming Enzymes in Plastids Manfred Liitzow, Peter Beyer, and Hans Kleinig Institut für Biologie II, Universität Freiburg, Schänzlestraße 1, D-7800 Freiburg, Bundesrepublik Deutschland Z. Naturforsch. 45c, 856-858 (1990); received April 6 , 1990 Command, Bleaching Herbicide, Prenyl Diphosphates, Carotinoid Formation, Plastids The herbicide Command (2-(2-chlorophenyl)methyl-4,4-dimethyl-3-isoxazolidinone) does not affect the in vitro activities o f the plastid enzymes catalyzing the steps leading

instead was found to be correlated with a constant reduction in the cell volume. The present paper reports the crystal chemical study of the end-member AgTbP 2 O 7 , performed by combining SEM-EDS, powder X-ray diffraction (PXRD) and FTIR spectroscopy. This work represents an additional piece of knowledge in our ongoing research project on the synthesis and structural properties of potentially luminescent materials that we are carrying out in the last years [ 12 ], [ 13 ]. Experimental Silver terbium diphosphate was prepared by solid-state reaction using stoichiometric