Category: pyridine-derivativesIn 2017 ,《Magneto-structural correlations in a family of di-alkoxo bridged chromium dimers》 appeared in Dalton Transactions. The author of the article were Fraser, Hector W. L.; Nichol, Gary S.; Velmurugan, Gunasekaran; Rajaraman, Gopalan; Brechin, Euan K.. The article conveys some information:
A series of di-alkoxo bridged Cr(III) dimers were synthesized using pyridine alc. ligands. The structures fall into four general categories and are of formula: [Cr2(OMe)2(pic)4]·0.5MeOH·0.5Et2O (1), [Cr2(hmp)2(pic)2X2] (X = Cl (2), Br (3)), [Cr2(L)2Cl4(A)2]·2S (L = hmp, A = H2O and S = Et2O (4); L = hmp, A = pyridine and S = pyridine (5); L = hmp, A = 4-picoline and no S (6); L = hep, A = H2O and S = MeCN (7)), and [Cr(hmp)(hmpH)Cl2]·MeCN (8). D.c. (d.c.) magnetic susceptibility measurements show relatively weak antiferromagnetic exchange interactions between the Cr(III) centers with J values <|15| cm-1 in all of the complexes measured. DFT calculations performed on complexes 1-8 reproduce both the sign and strength of the exchange interactions found exptl., and confirm that the magnitude and sign of the J value is strongly dependent upon the orientation of the dihedral angle formed between the bridging Cr2O2 plane and the O-R vector of the bridging group (θ), and the Cr-O-Cr-O dihedral angle (ψ). After reading the article, we found that the author used 2-(2-Hydroxyethyl)pyridine(cas: 103-74-2Category: pyridine-derivatives)
2-(2-Hydroxyethyl)pyridine(cas: 103-74-2) belongs to pyridine. The basicity and metallophilic high donor number of these π-deficient systems has long favored them as ligands in metal catalysis. The last decade saw pyridine assume a stronger role as functional group for directed C–H oxidation/activation.Category: pyridine-derivatives