Copper(II) solvatochromic complexes [Cu(acac)(N^N)(ligand)]BPh4 with various axial ligands. Correlation between coordination geometries and d–d transition energies (acac=acetylacetonato, N^N=1,10-phenanthoroline, 2,2′-bipyridyl)

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A series of copper(II) solvatochromic complexes [Cu(acac)(N^N)(ligand)]BPh4 (acac = acetylacetonato; N^N = 1, 10-phenanthoroline (1), 2, 2′-bipyridyl (2); ligand = HMPA, pyridine, DMSO, DMF, MeOH, acetone, and MeCN) have been synthesized and their coordination geometries were crystallographically investigated. The solvent-coordinated cations, adopting a five-coordinate square-pyramidal structure, formed head-to-tail dimers via π⋯π interactions. Solid-state absorption studies revealed that their d–d transition energies are correlated with the donor number of the axial ligands. A linear correlation was found between the d–d transition energies and the Cu–O (axial ligands) distances in the solid-state, revealing the role of the coordination environment on the d–d transition energies in the copper(II) solvatochromic complexes.

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  • Polyhedron

    Polyhedron 50 (1), 66-74, 2013-02

    Elsevier Ltd.

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