Synthesis, characterization and application of two new lariat crown ethers in construction of PVC membrane, coated wire and coated graphite electrodes: application to flow injection potentiometry was written by Shamsipur, Mojtaba;Dezaki, Abbas Shirmardi;Akhond, Morteza;Sharghi, Hashem;Khalife, Reza. And the article was included in International Journal of Environmental Analytical Chemistry in 2011.Quality Control of Dimethyl decanedioate This article mentions the following:
Two lariat crown ethers, 7-(2-Hydroxy-5-methylbenzyl)-5,6,7,8,9,10-hexahydro-2H-benzo[b][1,4,7,10,13]pentadecine-3,11(4H,12H)dione (L1) and, 7-(5-tert-butyl-2-hydroxybenzyl)-5,6,7,8,9,10-hexahydro-2H-benzo[b][1,4,7,10,13]dioatriazacyclopentadecine-3,11(4H,12H)dione (L2) were synthesized, characterized and used as active components for fabrication of PVC membrane electrode (PME), coated graphite electrode (CGE) and coated wire electrodes (CWE) for sensing Co2+ ion. Potassium tetrakis(p-cholorophenyl) borate(KTpClPB) and o-nitrophenyloctyl ether (o-NPOE) were added in a PVC matrix. The two lariat ethers were tested, L1 showed better electrode characteristics than L2. The electrodes exhibited linear Nernstian responses to Co2+ ion in the linear concentration range of 3.3 × 10-6-1.9 × 10-2 M (for PME), 2.3 × 10-7-7.9 × 10-2 M (for CWE), and 5.0 × 10-8-1.2 × 10-2 M (for CGE). The CGE was used as a proper detection system in flow-injection potentiometry (FIP) with a linear Nernstian range of 2.3 × 10-7-1.2 × 10-2 M over a pH range of 3.2 to 8.0; the limit of detection for PME, CWE, CGE, and CGE-FIP systems are 1.2 × 10-6, 2.5 × 10-7, 3.5 × 10-8 and 1.0 × 10-7 M, resp. The electrodes revealed fairly good discriminating ability towards Co2+ in comparison with a large number of alkali, alk. earth, transition and heavy metal ions. The electrodes are chem. inert, showing fast response time of <5 s, and could be used practically over a period of 1 mo. CGE also was used for measurement of Co2+ in binary mixtures In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Quality Control of Dimethyl decanedioate).
Dimethyl decanedioate (cas: 106-79-6) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Quality Control of Dimethyl decanedioate
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Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics