The 3-Cl-6-amino-(2′-picolyl)-1,2,4,5-tetrazine ligand HL1 has been synthesized and structurally characterized. Its versatile coordination behavior has been evidenced through reactions with Cu(Hfac)2 and Cu(triflate)2 precursors, which provided mixed-valence bimetallic Cu1.5Cu1.5 complexes [Cu2(μ-Cl)(L1)2] 2 and [Cu2(μ-triflate)(L1)2] 5. Changing the Cu(II) precursor and the solvent leads to the formation of mononuclear octahedral Cu(II) complexes [CuCl2(HL1)2]·2CH3CN 3 and [Cu(Hfac)2(HL1)] 4, in which only the amino-pyridine unit is involved in the coordination of the metal center. In contrast, in complexes 2 and 5, the ligands are deprotonated and bridge the metal centers as pyridine-amido-tetrazine fragments, while a bridging chloride or triflate ligand completes the coordination sphere of the metal ions. The Cu–Cu distances of 2.4313(4) Å in 2 and 2.5198(10) Å in 5 lie among the shorter values within mixed-valence bimetallic Cu complexes. Mixed-valence character is strongly supported by DFT calculations, showing the equal repartition of the unpaired electron between the two metal centers.
Versatile coordination behaviour of the chloro-tetrazine-picolylamine ligand: Mixed-valence binuclear Cu(i)/Cu(ii) complexes / Stetsiuk O.; Petrusenko S.R.; Sorace L.; Lupan A.; Attia A.A.A.; Kokozay V.N.; El-Ghayoury A.; Avarvari N.. - In: DALTON TRANSACTIONS. - ISSN 1477-9226. - STAMPA. - 48:(2019), pp. 11966-11977. [10.1039/c9dt02379h]
Versatile coordination behaviour of the chloro-tetrazine-picolylamine ligand: Mixed-valence binuclear Cu(i)/Cu(ii) complexes
Sorace L.;
2019
Abstract
The 3-Cl-6-amino-(2′-picolyl)-1,2,4,5-tetrazine ligand HL1 has been synthesized and structurally characterized. Its versatile coordination behavior has been evidenced through reactions with Cu(Hfac)2 and Cu(triflate)2 precursors, which provided mixed-valence bimetallic Cu1.5Cu1.5 complexes [Cu2(μ-Cl)(L1)2] 2 and [Cu2(μ-triflate)(L1)2] 5. Changing the Cu(II) precursor and the solvent leads to the formation of mononuclear octahedral Cu(II) complexes [CuCl2(HL1)2]·2CH3CN 3 and [Cu(Hfac)2(HL1)] 4, in which only the amino-pyridine unit is involved in the coordination of the metal center. In contrast, in complexes 2 and 5, the ligands are deprotonated and bridge the metal centers as pyridine-amido-tetrazine fragments, while a bridging chloride or triflate ligand completes the coordination sphere of the metal ions. The Cu–Cu distances of 2.4313(4) Å in 2 and 2.5198(10) Å in 5 lie among the shorter values within mixed-valence bimetallic Cu complexes. Mixed-valence character is strongly supported by DFT calculations, showing the equal repartition of the unpaired electron between the two metal centers.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.