Design, synthesis, and characterization of bis(娓?oxo)dimanganese(III,III) complexes. Steric and electronic control of redox potentials was written by Goodson, Patricia A.;Oki, Aderemi R.;Glerup, Joergen;Hodgson, Derek J.. And the article was included in Journal of the American Chemical Society in 1990.Computed Properties of C7H6N2 This article mentions the following:
The new ligands N,N-bis((6-methylpyrid-2-yl)methyl)-N-2-pyridylmethylamine (L), N,N’-bis((4-methylpyrid-2-yl)methyl)ethane-1,2-diamine (L1) and N,N‘-bis(2-methylpyrazyl)ethane-1,2-diamine (L2) were prepared and reacted with Mn salts to give [L3MnO2]22+ salts (L3 = L, L1, L2). [L4MnO]2(ClO4)2璺疕2O (I; L4 = N,N‘-bis((6-methylpyrid-2-yl)methyl)ethane-1,2-diamine) crystallized in the triclinic space group P1铏? Z = Z, R = 0.0759. [LMnO]2(NO3)2璺?H2O (II) crystallized in the monoclinic space group C2/c with Z = 4, R = 0.0683. [L2MnO]2(ClO4)2璺?H2O (III) crystallized in the monoclinic space group C2, Z = 4, R = 0.0515. The complexes are all found to contain the isomer in which the substituted pyridine (or the pyrazine) groups are trans axially disposed around the metal relative to the bridging oxo groups. I and II display very long axial Mn-N bonds which can be attributed to the presence of the 6-Me groups on the pyridine rings, and this steric constraint has been demonstrated to be the cause of the stabilization of the Mn(III,III) form in these complexes. In III, the stabilization of the III/III form is an electronic consequence of the change from pyridine (pKa = 5.20) to pyrazine (pKa = 0.65). Cyclic voltammograms of I and II show that the 2 redox waves are shifted by approx. 0.4 V, in each case, relative to L4 and tris(2-pyridylmethyl)amine complexes. The fully oxidized form of complex I acted as a 2-electron electrocatalytic oxidant, selectively oxidizing PhCH2OH to BzH. In the experiment, the researchers used many compounds, for example, 4-Methylpicolinonitrile (cas: 1620-76-4Computed Properties of C7H6N2).
4-Methylpicolinonitrile (cas: 1620-76-4) belongs to pyridine derivatives. Pyridine is diamagnetic and has a diamagnetic susceptibility of 閳?8.7 鑴?10閳? cm3璺痬ol閳?.The molecular electric dipole moment is 2.2 debyes. The standard enthalpy of formation is 100.2 kJ璺痬ol閳? in the liquid phase and 140.4 kJ璺痬ol閳? in the gas phase. Many analogues of pyridine are known where N is replaced by other heteroatoms . Substitution of one C閳ユ弻 in pyridine with a second N gives rise to the diazine heterocycles (C4H4N2), with the names pyridazine, pyrimidine, and pyrazine.Computed Properties of C7H6N2