Abstract
Synthetic porphyrins have, in the last years, gained increasing interest in analytical chemistry as unique reagents for the detection of metal ions. The porphyrin is a high sensitive chromogenic reagent. Porphyrins and their metal complexes generally exhibit characteristic sharp and intensive absorption bands in visible region. The region from 400 to 500 nm, which is called the Soret band, shows the most intensive absorption, and molar absorptivities about 105 are often found. Soret band (400-500 nm) shows the most intensive absorption of these compounds, molar absorptivities often being about 105. The Soret band is widely used for spectro- photometric detection of metalloporphyrins. From the perspective of analytical chemistry, the porphyrin ligand has turned out to be very versatile, and almost all metals have been combined with porphyrin. From this point of view several porphyrins become useful as the spectrophotometric reagents for the determination of metal ions.
Highlights
There is sufficient interest towards plasmachemical processes arising at the action of gas discharge plasma at water and electrolyte solutions
It is due to prospects of plasma-solution system applications for water purification and sterilization [1,2,3,4], surface modification of synthetic and native polymer materials [5,6,7], synthesis of nanomaterials [8,9]
The application of porphyrins as high sensitive agents for metal cations detection is limited by insolubility of most porphyrins and their metallocomplexes in water
Summary
There is sufficient interest towards plasmachemical processes arising at the action of gas discharge plasma at water and electrolyte solutions. The main role in these processes belongs to active particles formed in solution surface layer under the action of ion bombardment (H·, HO·, esolv) [10]. This layer is very thin (tens of nm), but despite it primary active species have time to react within it. Porphyrins form stable coordination compounds with majority of metals (except alkali ones) with formula 1:1 (one ligand per one metal ion). It is important, that porphyrins and their metallocomplexes have typical electronic spectra and ultimate high absorbance factors (ε), they are up to 200,000 in the range of 390 - 420 nm called Soret band [18]. These reactions may be controlled by usual chemical kinetic methods, by spectrophotometry ones, for example
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