Selectivity improvement of semi-conducting gas sensors by selective filter for atmospheric pollutants detection

Synthesis, Separation and UV/Vis Spectroscopy of Pyrazino‐quinoxalino‐porphyrazine Macrocycles

“…[1] Symmetrically tetra-and octasubstituted Pc have been intensely investigated with respect to their physical properties and they are used in different areas, such as chemical sensors, [2] liquid crystals, [3] photodynamic therapy (PDT) [4][5][6] and laser dyes. [7] In some of these applications, absorption at longer wavelengths is very advantageous, for example, in PDT it enables the depth of the therapeutic intervention to be increased.…”

“…[15] This undesirable property can be eliminated by the linear annelation of aromatic rings to the macrocyclic system, thus resulting in tetra [2,3]quinoxalinoporphyrazines or their isomers, tetra [6,7]quinoxalinoporphyrazines (TQP), the aza-analogues of Nc ( Figure 1). The tetra [6,7]quinoxalinoporphyrazines are characterized by a stronger red shift of around 40 nm compared with their corresponding isomers, tetra [2,3]quinoxalinoporphyrazines.…”

“…[15] This undesirable property can be eliminated by the linear annelation of aromatic rings to the macrocyclic system, thus resulting in tetra [2,3]quinoxalinoporphyrazines or their isomers, tetra [6,7]quinoxalinoporphyrazines (TQP), the aza-analogues of Nc ( Figure 1). The tetra [6,7]quinoxalinoporphyrazines are characterized by a stronger red shift of around 40 nm compared with their corresponding isomers, tetra [2,3]quinoxalinoporphyrazines. [11] Tetra [2,3]quinoxalinoporphyrazines have been known for some time, [11,[16][17][18] however, to the best of our knowledge their isomers, which are more suitable from the point of view of the spectral properties, have been investigated in more detail in only one case recently.…”

“…The tetra [6,7]quinoxalinoporphyrazines are characterized by a stronger red shift of around 40 nm compared with their corresponding isomers, tetra [2,3]quinoxalinoporphyrazines. [11] Tetra [2,3]quinoxalinoporphyrazines have been known for some time, [11,[16][17][18] however, to the best of our knowledge their isomers, which are more suitable from the point of view of the spectral properties, have been investigated in more detail in only one case recently. [19] In this work we have focused on porphyrazines containing the [6,7]quinoxalino moiety.…”

Selective Detection of NO2 with Specific Filters for O3 Trapping

“…In addition to the direct health risks, O3 can also chemically react with various indoor pollutants [1,2] to produce more toxic volatile compounds. Since O3 is the main interfering pollutant for NO2 monitoring in the context of air quality control, various filters (nanocarbon, indigo thin film or MnO2) were proposed and were found to efficiently trap O3 without trapping NO2 [3,4]. However, due to their structure, these filters were found to be too shortlived.…”