The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 5,6-Dichloropyrazine-2,3-dicarbonitrile(SMILESS: N#CC1=NC(Cl)=C(Cl)N=C1C#N,cas:56413-95-7) is researched.Electric Literature of C6Cl2N4. The article 《Cationic azaphthalocyanines bearing aliphatic tertiary amino substituents-Synthesis, singlet oxygen production and spectroscopic studies》 in relation to this compound, is published in Journal of Photochemistry and Photobiology, A: Chemistry. Let’s take a look at the latest research on this compound (cas:56413-95-7).
New cationic zinc azaphthalocyanines (AzaPc) were prepared using a statistical method of synthesis starting from 5,6-bis(2-diethylaminoethylsulfanyl)pyrazine-2,3-dicarbonitrile (A) and 5,6-bis(tert-butylsulfanyl)pyrazine-2,3-dicarbonitrile (B). All the six possible AzaPc derivatives were detected on TLC but only five of them were finally isolated using column chromatog. on silica (excluding AAAB type). The adjacent (AABB) and opposite (ABAB) isomers were well separated Singlet oxygen quantum yields (ΦΔ) were measured using the DPBF decomposition method. Values of ΦΔ in anhydrous DMF drastically decrease with the number of amino groups from 0.66 for BBBB type to 0.04 for AAAA type. The same dependence was observed in anhydrous DMF for the corresponding hydrochlorides. When DMF/water 95:5 added with HCl was used, the ΦΔ values for amino AzaPc increased to approx. 0.66. This suggests that solvation of the amino and Cl- ions plays an important role in the separation of the AzaPc mols. although no changes were found in UV-vis spectra. At least eight cationic charges are necessary for complete monomerization of AzaPc in water. Fewer charges lead to significant decrease of the absorption in the area of the Q-band and to pronounced dimeric character of the absorption spectrum.
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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate