61007-89-4Relevant academic research and scientific papers
Crystalline modification of a manganese complex
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Page/Page column 7, (2008/06/13)
This invention relates to a novel crystal form of the 1:1 manganese (III) complex of N,N′,N″tris[salicylideneaminoethyl]amine, a process for its preparation and the use thereof.
Manganese(III) Complexes with MnIIIN3O3 (S = 2) Co-ordination by Sexidentate Schiff-base Ligands: Synthesis, Spectra and Electrochemistry
Ramesh, Krishnamoorthi,Bhuniya, Debnath,Mukherjee, Rabindranath
, p. 2917 - 2920 (2007/10/02)
Complexes of high-spin manganese(III) (μeff = 4.79-5.30 at 298 K) with a closely related group of sexidentate Schiff-base ligands have been prepared and their solution properties thoroughly investigated.The brown to green crystalline complexes display ligand-to-metal charge-transfer transitions in the range 330-400 nm in addition to a crystal-field transition in the range 560-600 nm.The solution stereochemistry has been determined by paramagnetically shifted 1H NMR spectroscopy.Unlike the C3 symmetry in the solid-state structure, in solution the MnIIIN3O3 co-ordination sphere is severely distorted (ca.C1 symmetry).Cyclic voltammetric studies in dimethylformamide solution reveal an irreversible MnIII-MnII couple pc in the range -0.62 to -0.05 V vs. saturated calomel electrode (SCE)> and a quasi-reversible MnIV-MnIII couple (Ef in the range +0.42 to +0.86 V vs.SCE).
