Abstract
Newly designed three trinuclear coordination compounds [Ni3(L1)2(OAc)2(CH3OH)2] (1), [Ni3(L1)2(OAc)2(CH3CH2CH2OH)2]·2CH3CH2CH2OH (2) and [Ni3(L1)2(OAc)2(DMF)2]·1.71DMF (3) and one mononuclear coordination compound [Cu(L2)2] (4) have been synthesized by H2L1 and nickel(II) and copper(II) acetate hydrates in different solvents. Single-crystal X-ray structure determinations revealed that the coordination compounds 1–3 have analogous molecular structures. The coordination compounds 1, 2, and 3 were affected by the coordinated methanol, n-propanol, and N,N-dimethylformamide molecules, respectively, and the various coordinated solvent molecules give rise to the formation of the representive solvent-induced NiII coordination compounds. All the NiII atoms are six-coordinated with geometries of slightly distorted octahedron. Obviously, in the coordination compound 4, the expected salamo-like mono- or tri-nuclear CuII coordination compound has not been obtained, but a new CuII coordination compound [Cu(L2)2] has been gained. The Cu1 atom is four-coordinated and possesses a geometry of slightly distorted planar quadrilateral. Furthermore, the fluorescence properties of coordination compounds 1–4 and magnetic behavior of coordination compound 1 were investigated.
Highlights
New absorption peaks are observed at about 345–367 nm in the coordination compounds 1–4 that might be owing to L→M charge-transfer transitions, which are characteristic of the transition metallic coordination compounds with N2 O2 coordination spheres [63,64,65]
The coordination compound 1 belongs to the triclinic system, with space group P − 1, which includes of three NiII atoms, two completely deprotonated (L1 )2− units, two μ2 -acetato ligands, and two coordinated methanol molecules
The results show that the distances between the metallic ions and the oxygen atoms from the solvent molecules are related to these solvent molecules
Summary
Salen-like ligands and their analogues continue to play an increasingly vital roles in inorganic chemistry in the last decades [1,2,3,4], since their metallic coordination compounds are widely used in catalysis activities [5,6], magnetic materials [7,8,9,10], biological fields [11,12,13,14,15,16,17], supramolecular architectures [18,19,20,21], molecular recognitions [22,23,24,25], and luminescence properties [26,27,28,29,30]. Following our previous research on the syntheses, crystal structures, and fluorescent and antimicrobial properties of CoII and NiII coordination compounds with salamo-like bisoxime.
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