A multifrequency high-field EPR (9–285 GHz) investigation of a series of dichloride mononuclear penta-coordinated Mn(II) complexes |
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| Institution: | 1. Department of Chemistry, College of Chemistry and State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130023, China;2. Department of Materials Science and Engineering, Jilin Jianzhu University, Changchun 130118, China |
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| Abstract: | The electronic structure of a series of 11 penta-coordinated dichloride mononuclear Mn(II) complexes Mn(L)Cl2] (L = Cl-terpy, Br-terpy, OH-terpy, phenyl-terpy, tolyl-terpy, mesityl-terpy, EtO-terpy, Me2N-terpy, tBu3-terpy, py-phen, and dpya) has been investigated by a multifrequency EPR study (9–285 GHz). The X-ray structures of Mn(Br-terpy)Cl2], Mn(EtO-terpy)Cl2], Mn(Me2N-terpy)Cl2] and Mn(tolyl-terpy)Cl2] are described. The spin Hamiltonian parameters have been determined for all complexes and show that the steric and electronic effects of the N-tridentate ligand L do not induce appreciable variations on the zero field splitting parameters. The magnitude of D, close to 0.3 cm−1, is governed by the chloride anion. High-field EPR spectroscopy allows the determination of electronic parameters of mononuclear Mn(II) complexes characterized by relatively large magnitudes of D and the unambiguous interpretation of the X-band spectra of these kinds of complexes. |
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