Correlation between crystal symmetry and the splitting of d orbital in the thiocyanate nickel(II) complexes |
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| Authors: | JG Małecki A Świtlicka T Groń M Bałanda |
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| Institution: | 1. Department of Crystallography, Institute of Chemistry, University of Silesia, ul. Szkolna 9, 40-006 Katowice, Poland;2. Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland;3. The Henryk Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342 Kraków, Poland |
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| Abstract: | New Ni(SCN)2(L)4/2] complexes, where L = py (1), γ-pic (2), pyCH2OH (3), py(CH2)3OH (4) were synthesized in simple reactions of NiCl2·6H2O with ammonia thiocyanate and pyridine type ligands in methanol solutions. Blue crystals of Ni(SCN)2(py)4] (1), Ni(SCN)2(pyCH2OH)2] (3) and Ni(SCN)2(py(CH2)3OH)2] (4) crystallize in the monoclinic system, blue crystal of Ni(SCN)2(γ-pic)4] (2) – in the tetragonal one, and red crystal of Ni(SCN)2(PPh3)2] (5) – in the triclinic one. The ligands of complexes (1) and (3) were indicated as rather strong π-acceptors while that of complex (4) one has some π-donor properties. When the aliphatic chain (CH2) elongates in the sequence: (1), (3) and (4), an increase in the orbital contribution to the magnetic moment and a decrease in the 10Dq value of the d orbital splitting are related to the change of the point group symmetry from D2h, via D2v to C2h. |
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| Keywords: | Inorganic chemistry Paramagnetism |
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