55140-69-7Relevant academic research and scientific papers
Manganese(II) Complexes containing the Tridentate Ligands 2,6-Bispyridine, L1, or 2,6-Bispyridine, L2. The Molecular Structures of Five-co-ordinate 1> and the Zinc Analogue 1>
Edwards, Dennis A.,Mahon, Mary F.,Martin, William R.,Molloy, Kieran C.,Fanwick, Phillip E.,Walton, Richard A.
, p. 3161 - 3168 (1990)
Reactions of equimolar ratios of MnX2*4H2O (X = Cl or Br) and the tridentate ligands 2,6-bispyridine (L1) or 2,6-bispyridine (L2) afford the five-co-ordinate complexes 1> and 2>.The complex 1>, as the monobenzene solvate, crystallises in the space group P212121 with a = 8.761(3), b = 17.032(5), c = 17.453(5) Angstroem, and Z = 4.The distorted trigonal-bipyramidal geometry around manganese involves a trigonal plane with angles close to 120 deg comprising both bromines and the pyridyl nitrogen of L1.However, strain induced by this ligand reduces the axial NMnN angle to 142.8 deg.The Mn-N(pyridyl) bond is markedly shorter than the axial Mn-N(imino) bonds.For comparison, the structure of 1>, as the 1.5MeCN solvate, has been determined.This complex crystallises in the triclinic space group P1/ with a = 8.977(3), b = 12.585(5), c = 22.297(6), α = 90.99(3), β = 98.27(2), γ = 94.33(3) deg, and Z = 4.The two independent molecules of 1> in the asymmetric unit are geometrically identical within the limits of experimental error, with bond lengths and angles differing less than twice the estimated standard deviations.The distorted trigonal-bipyramidal geometry and bond length and angle variations are similar to those of the manganese complex.Reactions of Mn(ClO4)2*6H2O with 2 equivalents of L1 or L2 produce the cations 12>2+ and 22>2+ isolated as the perchlorates.The two ligands of the octahedral cations are co-ordinated in a meridional manner.
