Dicarboxylate-complexed phosphat

In aq soln HgjfNOjfj reacts with Na4P207 (Na4L) to form complex ions with the formulas [Hg2(OH)L] and [Hg2L2r. The tripolyphosphate [PjO,)] " and tetrapolyphosphate [P40 3] ions form similar complex ions. The stability of these complex phosphates decreases as the chain length increases. The dicarboxylic acids oxalic, dimethylmalonic and succinic, H2L, form complexes with Hg2 ions ... 

A tetraamidinium functionalized, bowl-type cavitand (receptor 8) was developed by Diederich and Sebo [47]. This receptor was found to complex 1,3-dicarboxylate anions with good selectivity and a 1 2 binding stoichiometry both in CD3OD and D20, as revealed by standard Job plot analysis. In contrast, various nucleotide phosphates were found to be bound with a 1 1 stoichiometry in D20. In the case of the adenosine phosphates, the association constants increased as a function of nucleotide charge [i.e., the affinity order (K., M-1) was cAMP (1400) < AMP (10000)charged receptor (8) also showed moderate selectivity towards AMP (Ka = 10 000 M-1) over other nucleotide monophosphate anions, such as GMP (FCa = 5200 M-1), CMP (fCa = 3500 M-1), TMP (K l — 5900 M ), and UMP (Ka-3800M ) in D20 containing TRIS buffer (2.5 mM, pH 8.3). 

Figure 17 Speciation of Nd in a number of world rivers calculated in the solution fraction (<0.2 pm) by considering inorganic complexes (carbonate and phosphate), mineral and organic colloidal Nd species (dicarboxylic...

Many enzymes are dependent on dissociable metal ions for their activity, and the operation of most of the important metabolic systems thus requires the presence of these cofactors. For example, the list of enzymes requiring Mg is a long one and includes the oxidases and decarboxylases for the keto acids, most of the enzymes involved in phosphate metabolism, some dehydrogenases, some peptidases, phosphoglucomutase and enolase. These enzymes may be inhibited with inhibitors forming stable complexes with Mg ions. For example, malonate and other dicarboxylic compounds are able to chelate effectively with Mg" and other metal ions, and their inhibition may result from the reduction of metal ion concentration in the medium or the removal of the metal ions from the enzyme [3] ... 

Potassium C21-dicarboxylate. See Potassium cyclocarboxypropyloleate Potassium cetyl phosphate CAS 19035-79-1 EINECS/ELINCS 242-769-1 Synonyms 1-Hexadecanol, dihydrogen phosphate, monopotassium salt 1-Hexadecanol, phosphate, potassium salt Phosphoric acid, cetyl ester, potassium salt Definition Potassium salt of a complex mixture of esters of phosphoric acid and cetyl alcohol Empiricai C16H36KO4P Properties Anionic... 

Dicarboxylic acids (Cg-Cig, even) were analyzed as their mono-coenzyme A, mono-camitine, and 4-nitrobenzyl esters [1063]. The mono-coenzyme A esters were baseline resolved on a C g column (photodiode array detector, A = 200-300 nm) using a complex 45-min 5/95 - 50/50 acetonitrile/water (50 mM KH2PO4 buffer at pH 5.3) gradient. Peak shsqjes were excellent. The mono-camitine esters were analyzed as their 4-bromophenacyl derivatives on a Cg column (A = 260 nm) using a complex 40-min 60/38/2 -> 95/0/5 acetonitrile/water/water (0.15 M triethylamine phosphate buffer at pH 5.6) gradient. The 4-nitrobenzyl derivatives were resolved on... 

The chapter is split into two major sections, ionic recognition and molecular covalent recognition. Ionic recognition discusses synthetic receptor molecules designed to bind cations (metal, ammonium, bipyridinium ions) and anions (halide, azide, sulphate, phosphate, dicarboxylate ions etc.). The section on molecular covalent recognition describes the complexation of neutral (un-... 

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