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B(CN) 4  - , C(CN) 3  - , and N(CN) 2  - are highly versatile polycyano anions that produce various functional compounds. To investigate the coordination abilities of these anions in the solid state quantitatively, we synthesized mixed-ligand Cu(ii) complexes: [Cu(R-acac)(tmen)X] (X = polycyano anion, R-acac = acetylacetonate or butyl-acetylacetonate, tmen = tetramethylethylenediamine). The coordination abilities of the anions, increasing in the order B(CN) 4  - &lt; C(CN) 3  - &lt; N(CN) 2  - , result in a decrease in the d-d transition energies of the complexes and the shortening of the axial coordination distance. The influence of crystal packing on the coordination geometries and d-d transition energies of the complexes was also demonstrated. The donor numbers of the anions were determined from the d-d transition energies in solution.

dalton transactions

Coordination abilities of polycyano anions in the solid state: coordination geometries and d–d transition energies of mixed-ligand solvatochromic copper(<scp>ii</scp>) complexes with B(CN)4, C(CN)3, and N(CN)2 anions

Coordination abilities of polycyano anions in the solid state: coordination geometries and d–d transition energies of mixed-ligand solvatochromic copper(ii) complexes with B(CN)4, C(CN)3, and N(CN)2 anions

Coordination abilities of polycyano anions in the solid state: coordination geometries and d–d transition energies of mixed-ligand solvatochromic copper(ii) complexes with B(CN)₄, C(CN)₃, and N(CN)₂ anions