Ethylenediamine A -

Among the complexing agents that find use as titrating agents, ethylenediamine-A,A(A, A-tet-raacetic acid (acronym EDTA, and equation abbreviation, H4Y) is by far the more important, and it is used in the vast majority of complexometric titrations. The successive acid values of H4Y are pKi = 2.0, pisTj = 2.67, = 6.16, pTCt = 10.26 at 20°C and an ionic strength of 0.1. The fraction... 

For the preparation of CoSalophen Y the Co—Y was impregnated by salicy-laldehyde, and 1,2-phenylenediamine in methanol was added slowly to the mixture.107 This was a successful encapsulation of a salen-type complex with larger diamine than the ethylenediamine, a successful preparation of an encaged metal-salen complex by the intrazeolite ligand synthesis method, and a successful intrazeolite synthesis using two different precursor molecules. 

Ar,A,-bis(2-hydroxybenzyl)-ethylenediamine-A,A, -diacetic acid (HBED) and IV-hydroxybenzyl-ethylenediam i ne- A-, A", N -iri acetic acid (HBET) are multidentate ligands investigated for coordination with gallium and indium (Figure l).78 HBED, with its two phenolate donor groups, led to increased stability constants over HBET. 

About 98% of EDC is used to manufacture VC. Relatively small amounts are used in the manufacture of perchloroethylene (an industrial degreaser and dry cleaning agent), in the manufacture of methyl chloroform (an anesthesia), and ethylenediamine (a fungicide and antifreeze inhibitor). About 99% of VC is used to manufacture polyvinyl chloride in a polymer-... 

The addition of certain basic anions such as OH , COs", and Ac , increases the rate at which Hg(en)2" " reacts with H2 (Fig. 3). This effect was observed under conditions of complete complexing of the mercuric ion with ethylenediamine, the rate being independent of the (excess) ethylene-diamine concentration. It is clear that the effect of the added anions is not due to their complexing of mercury by replacement of ethylenediamine. A possible explanation of the effect of OH [which was also observed for the... 

The ligands showing this behaviour are acetic acid, mercaptoacetic acid, methoxyacetic acid, acetylacetone, dipicolinic acid and A -(2-hydroxyethyl)ethylenediamine A,A,A -triacetic acid. 

Table 3.3 lists the log Pi and the EpTTa of Eu(III) complexes with iminodiacetic acid (IDA), nitrilotriacetic acid (NTA), A -(2-hydroxyethyl)ethlenediamine-A, A, A -triacetic acid (HEDTA), ethylenediamine-A, A, A, A -tetraacetic acid (EDTA),... 

---