Beryllium carboxylates

Be40(02CCH3)e. The acetate is typical of the basic beryllium carboxylates (Be(OH)2 plus ethanoic acid). The structures have O at the centre of a tetrahedron of Be with carb-oxylate spanning each edge of the tetrahedron. Be(02CCH3)2 is formed from BeCl2 and glacial ethanoic acid. 

Beryllium, bis(trifluoroacetylacetone)-gas chromatography, 1,560 Beryllium acetate basic, 2, 304 complexes, 3, 8 Beryllium borohydride ammine complexes, 3, 8 Beryllium carboxylates basic, 3, 31... 

Basic beryllium acetate, [CAS 543-81-7], Be40(C2lL02)6, is the best known of the beryllium salts of organic adds which can be divided into normal beryllium carboxylates, Be(RCOOh. and beryllium oxide carhoxylates, Re40(RC.00). The basic aceiate is soluble in glacial acetic acid and can readily be crystallized therefrom in very pure form. It is also soluble in chloroform and other organic solvents. It has been used as a source of pure beryllium salts,... 

The above polymers, though soluble when initially prepared, disproportionate at room temperature to basic beryllium carboxylates and a cross-linked polymer. 

Basic beryllium carboxylate, polymers with diacid chlorides, disproportionation of, 243 Benzalazine... 

In addition to the oxide carboxylates, beryllium forms numerous chelating and bridged complexes with ligands such as the oxalate ion C204 , alkoxides, /9-diketonates and 1,3-diketonates. These almost invariably feature 4-coordinate Be... 

THE STRUCTURE OF THE CARBOXYL GROUP. II. THE CRYSTAL STRUCTURE OF BASIC BERYLLIUM ACETATE... 

Published equilibrium constants for monocarboxylato complexes are summarized in Table VII. All that can be deduced with certainty from these data is that the anions derived from monocarboxylic acids form rather weak complexes with beryllium. In all probability they act as monodentate ligands. The possibility of bidentate chelation using both carboxylate oxygen atoms can be ruled out on the grounds... 

The interaction of beryllium with nitrilotripropionic acid (H3ntp) has been investigated in some detail (244). This acid forms a strong complex (log Kt = 9.24) that can be isolated as a solid. The crystal structure of the anion [Be(ntp)] is shown in Fig. 23. The structure confirms the coordination of the nitrogen atom along with an oxygen atom from each carboxyl group. 

The superior coordinating capacity of phosphonate over carboxylate is illustrated in the 9Be NMR spectra in Fig. 25 (260). The similarity of the spectra obtained by reaction of BeS04 and methylphosphonic acid or phosphonacetic acid indicates that the carboxylate group is not bound to the beryllium under these experimental conditions. It should be noted that substitution of a water molecule by a phosphonate ligand causes the 9Be resonance to move upfield when it co-ordinates, as does the fluoride ion (271), the only other monodenate ligand... 

Benzohydroxamic acid dioxouranium complexes, 507 metal complexes, 506, 507 as metal precipitant, 506 Benzohydroxamic acid, iV-methyl-metal complexes, 506 Benzohydroxamic acid, N-phenyl-metal complexes, 507 reactions with carboxylic acids, 507 as metal precipitant, 506 titanium complexes, 506 Benzohydroxamic acid, A -(o-tolyl)-as metal precipitant, 506 Benzohydroxamic acid, N-wi-tolyl-p-methoxy-metal complexes, 506 Benzoic acid, dihydroxy-beryllium(II) complexes, 481 Benzoic acid, o-mercapto-esters... 

In the early 1950s there were proposed several procedures involving carboxylic acids for separation of metals such as copper and beryllium (9, 87, 140, 149). After these analytical applications of the carboxylate extraction system, Hok-Bemstrom published a series of papers dealing with the quantitative analysis of the extraction equilibria involving metal carboxylates (48-50). Since then the extraction of metal carboxylates has been extensively studied and the subject has been reviewed from time to time by the following authors Fletcher and Flett (23), Flett and Jaycock (26), Ashbrook (8), Miller (85), Rice (118), and Brzozka and Rozycki (14). Martinov has elaborated a data compilation... 

Beryllium is unique among the metal ions so far studied in that it is extracted as a tetrameric carboxylate, whose structure was thought to be similar to the tetrameric beryllium acetate. In the latter, four beryllium atoms are bridged by one oxo and six acetates (148). 

I herc is also an interesting series of basic beryllium complexes with the carboxylic acids which are covalent compounds of remarkable stability. Basic beryllium acetate, Be40(00C.CH3)g melts at 283°, boils at 330° without decomposition and dissolves in CHCI3 as the monomer it lacks ionic properties. Its structure has a central O atom surrounded tetrahedrally by tour... 

Beryllium in tap water, dialysis fluids and alkali-metal salts was determined with Chrome Azurol S after preconcentration of the complex on a column packed with polyethylene powder [1]. Sorption preconcentration of Be on a fibrous sorbent (poly(acrylonitrile)-carboxylated polyethylene-polyamine) prior to the determination of metal with Arsenazo I in sea water was described [2]. 

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