Application In Synthesis of 1H-Pyrazole-5-carbaldehyde. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: 1H-Pyrazole-5-carbaldehyde, is researched, Molecular C4H4N2O, CAS is 948552-36-1, about Mononuclear complexes of FeII, CoII and CoIII containing imine-based ligands of 8-aminoquinoline and 7-aminoindazole: spin state tuning of FeII complexes in solution. Author is Sanchez-Viveros, Jose Manuel; Bucio-Ortega, Job; Ortiz-Pastrana, Naytze; Olguin, Juan.
Five mononuclear metal complexes were synthesized, three complexes of iron(II), one complex of cobalt(III) and one complex of cobalt(II) containing imine ligands based on 8-aminoquinoline or 7-aminoindazole and 2-formylpyridine or 3-formylpyrazole, namely [FeII(L1)2](BF4)2 (1), [CoIII(L1)(L1′)](BF4)2 (2), [FeII(HL2)2](BF4)2 (3), [FeII(HL3)2](BF4)2 (4) and [CoII(HL3)2](BF4)2 (5). Iron(II) complexes 1 and 3 derived from 8-aminoquinoline and 2-formylpyridine or 3-formylpyrazole, resp., were stabilized in the LS-state (S = 0) as proven by NMR spectroscopy and x-ray crystallog., whereas complex 4, based on indazole and pyridine, shows a gradual and incomplete spin conversion in CD3CN solution (the Evans method). According to NMR spectroscopy and x-ray crystallog., the cobalt complexes 2 and 5 were stabilized in different oxidation states.
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