Electric Literature of C8H9NO2. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 3-Pyridinepropionic acid, is researched, Molecular C8H9NO2, CAS is 3724-19-4, about Entropy, enthalpy, and side arm porphyrins. 1. Thermodynamics of axial ligand competition between 3-picoline and a series of 3-pyridyl ligands covalently attached to zinc tetraphenylporphyrin.
A series of 5-coordinate Zn tetraphenylporphyrins, each with a covalently attached 3-pyridyl side chain of different length, were prepared NMR spectroscopy was used to study the displacement of the 3-pyridyl ligand by free 3-picoline in toluene-d8 solution Values of Keq, ΔH, and ΔS were dependent on the number of atoms in the chain. In all cases, 3-picoline formed a stronger bond with these Zn porphyrins than did the covalently attached pyridyl ligands. The entropy of free internal rotation of the atoms of the uncoordinated pyridyl side chain was an important factor in the entropy of displacement of the covalently attached pyridyl group. Measurement of the thermodn. quantities for 3-picoline addition to a series of structurally related 4-coordinate Zn porphyrins revealed the importance of bulky groups in preventing tight solvation of the porphyrin ring in the region of the binding site, thus increasing the stability and bond strength of the 3-picoline complex.
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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem