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The structures and magnetism of trinuclear Ni(II), Co(II) and Mn(II) complexes derived from unsymmetrical compartmental ligands |
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| Authors: | Harry Adams Laura R Cummings Masaaki Ohba Hiroshi Sakiyama |
| Institution: | a Department of Chemistry, The University of Sheffield, Dainton Building, Brook Hill, Sheffield S3 7HF, USA b Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki 6-10-1, Higashiku, Fukuoka 812-0053, Japan c Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, Kojirakawa 1-4-12, Yamagata 990-8560, Japan |
| Abstract: | Trinuclear Ni(II), Co(II) and Mn(II) complexes have been prepared from the asymmetric compartmental proligands 2-alkyliminomethyl-4-methyl-6-{methyl-(2-pyridin-2-yl-ethyl)-amino]-methyl}-phenol(alkyl=ethyl, n-propyl and n-butyl) and 2-(2-methoxy-ethylimino)-methyl]-4-methyl-6-{methyl-(2-pyridin-2-yl-ethyl)-amino]-methyl}-phenol, which provide adjacent tridentate N2O and bidentate NO donor sets. The crystal structures of Ni3(L6)2(OAc)2(NCS)2] · CH3OH · H2O, Co3(L4)2(OAc)2(NCS)2], and Mn3(L7)2(OAc)2(NCS)2] · CH3OH · H2O were determined and show that the metals provide an isosceles triangle with M1-M2=M1-M3 ≈ 3.2 Å and M2-M3 ≈ 5.0 Å. The cryomagnetic properties of the complexes have been studied and indicate a weak antiferromagnetic interaction between the adjacent, M1M2 and M1M3 ions with little magnetic interaction between the terminal M2M3 ions. |
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