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Structural, spectral and magnetic properties of Ni(II), Co(II) and Cd(II) compounds with imidazole derivatives and silanethiolate ligands

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Abstract

A series of new metal heteroleptic complexes have been obtained in simple reactions of 1-(3-aminopropyl)-imidazole (api) and 1,4-bis(imidazol-1-yl)-butane (bbi) ligands with metal silanethiolates or acetylacetonates. The obtained complexes are the coordination polymers [Ni{SSi(tBuO)3}2(μ-api)]n 1, [Co{SSi(tBuO)3}2(μ-api)]n 2, [Cd{SSi(tBuO)3}2(μ-api)·2CH3OH]n 3, [Cd{SSi(tBuO)3}2(μ-bbi)·CHCl3]n 4 and the dimer [Co{SSi(tBuO)3}2(μ-bbi)·3CH3OH]2 5. Another coordination polymer with the formula [Ni(acac)2(μ-bbi)·9CHCl3]n 6 was obtained in the reaction of Ni(acac)2 with (tBuO)3SiSH (TBST) and bbi; however, the silanethiolate residue didn't coordinate to the metallic center as intended. The molecular structures of 1–6 were determined by single-crystal X-ray diffraction. Compounds 1–5 were additionally characterized by thermogravimetry (TGA) and powder X-ray diffraction. The emission spectra of the Cd complexes 3 and 4 were recorded in the solid state at ambient temperature, whereas 1, 2 and 5 were subjected to magnetic studies. Variable-temperature magnetic measurements of the polycrystalline sample 1 suggest the presence of weak intra-chain magnetic interactions between the nickel(II) ions. Magnetic studies of 2 and 5 show their paramagnetic behavior. For sample 1 as well as samples 2 and 5, a noticeable influence of single-ion magnetic anisotropy on their magnetic behavior has been revealed.

Graphical abstract: Structural, spectral and magnetic properties of Ni(ii), Co(ii) and Cd(ii) compounds with imidazole derivatives and silanethiolate ligands

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Publication details

The article was received on 23 Mar 2017, accepted on 25 May 2017 and first published on 26 May 2017


Article type: Paper
DOI: 10.1039/C7CE00555E
Citation: CrystEngComm, 2017, Advance Article
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    Structural, spectral and magnetic properties of Ni(II), Co(II) and Cd(II) compounds with imidazole derivatives and silanethiolate ligands

    D. Kowalkowska, A. Dołęga, N. Nedelko, Z. Hnatejko, Ł. Ponikiewski, A. Matracka, A. Ślawska-Waniewska, A. Strągowska, K. Słowy, M. Gazda and A. Pladzyk, CrystEngComm, 2017, Advance Article , DOI: 10.1039/C7CE00555E

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