Taya, Toshiki published the artcileComplexation behavior of heterocyclic hydrazones. II. Effects of steric factors on formation constants for nickel(II) complexes with heterocyclic hydrazones, Related Products of pyridine-derivatives, the publication is Bulletin of the Chemical Society of Japan (1994), 67(3), 710-19, database is CAplus.
The equilibrium of nickel(II) ion with thirteen nitrogen-heterocyclic hydrazones (neutral form: HL) with and without blocking group(s) have been investigated spectrophotometrically in 28% aqueous dioxane solution at 25°C and an ionic strength of 0.2 (KCl). For a series of 2-pyridinecarbaldehyde 5-substituted-2-pyridylhydrazones, the following linear free energy relationships (LFER) were derived between the overall formation constants, β1, β1‘, and β2, of Ni(HL)2+, NiL+, and Ni(HL)22+ complexes, resp., and the dissociation constants, Ka1 and Ka2, of H3L2+ and H2L+, resp.: log β1 = 0.95 (pKa1 + pKa2)/2 + 4.60, 1/2 log β2 = 0.95 × (pKa1 + pKa2)/2 + 4.82, and log β1‘ = 1.40 (pKa1 + pKa2)/2 + 9.73. The steric effects of the 6-Me group in pyridine and the quinolyl ring in place of pyridyl group on the complex formation were evaluated on the basis of LFER. The complex stabilization effect of the pyridyl group substituted for formyl hydrogen was also evaluated for Ni(HL)22+, Ni(HL)2+, and NiL+ complexes. These results together with LFER were discussed in conjunction with the thermodn. parameters for the formation of Ni(HL)2+ complex and the ligand field parameters, Dq, for Ni(HL)2+ and Ni(HL)22+ complexes.
Bulletin of the Chemical Society of Japan published new progress about 2215-33-0. 2215-33-0 belongs to pyridine-derivatives, auxiliary class Pyridine,Amine, name is 2-((2-(Pyridin-2-yl)hydrazono)methyl)pyridine, and the molecular formula is C7H8BBrO3, Related Products of pyridine-derivatives.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem