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Article

Mono- and Binuclear Copper(II) and Nickel(II) Complexes with the 3,6-Bis(picolylamino)-1,2,4,5-Tetrazine Ligand

1
Univ Angers, CNRS, MOLTECH-Anjou, SFR MATRIX, F-49000 Angers, France
2
Departament de Química Inorgànica, Instituto de Ciencia Molecular (ICMol), Universitat de València, Catedrático José Beltrán 2, 46980 Paterna, Spain
*
Authors to whom correspondence should be addressed.
Academic Editors: Pierre Audebert and Jean-Cyrille Hierso
Molecules 2021, 26(8), 2122; https://doi.org/10.3390/molecules26082122
Received: 16 March 2021 / Revised: 28 March 2021 / Accepted: 31 March 2021 / Published: 7 April 2021
(This article belongs to the Special Issue Tetrazines: A World of New Molecules Emerging from Old Chemistry)
Four new compounds of formulas [Cu(hfac)2(L)] (1), [Ni(hfac)2(L)] (2), [{Cu(hfac)2}2(µ-L)]·2CH3OH (3) and [{Ni(hfac)2}2(µ-L)]·2CH3CN (4) [Hhfac = hexafluoroacetylacetone and L = 3,6-bis(picolylamino)-1,2,4,5-tetrazine] have been prepared and their structures determined by X-ray diffraction on single crystals. Compounds 1 and 2 are isostructural mononuclear complexes where the metal ions [copper(II) (1) and nickel(II) (2)] are six-coordinated in distorted octahedral MN2O4 surroundings which are built by two bidentate hfac ligands plus another bidentate L molecule. This last ligand coordinates to the metal ions through the nitrogen atoms of the picolylamine fragment. Compounds 3 and 4 are centrosymmetric homodinuclear compounds where two bidentate hfac units are the bidentate capping ligands at each metal center and a bis-bidentate L molecule acts as a bridge. The values of the intramolecular metal···metal separation are 7.97 (3) and 7.82 Å (4). Static (dc) magnetic susceptibility measurements were carried out for polycrystalline samples 14 in the temperature range 1.9–300 K. Curie law behaviors were observed for 1 and 2, the downturn of χMT in the low temperature region for 2 being due to the zero-field splitting of the nickel(II) ion. Very weak [J = −0.247(2) cm−1] and relatively weak intramolecular antiferromagnetic interactions [J = −4.86(2) cm−1] occurred in 3 and 4, respectively (the spin Hamiltonian being defined as H = −JS1·S2). Simple symmetry considerations about the overlap between the magnetic orbitals across the extended bis-bidentate L bridge in 3 and 4 account for their magnetic properties. View Full-Text
Keywords: 1,2,4,5-tetrazine; nitrogen ligands; nickel; copper; crystal structure determination; magnetic properties 1,2,4,5-tetrazine; nitrogen ligands; nickel; copper; crystal structure determination; magnetic properties
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MDPI and ACS Style

Stetsiuk, O.; El-Ghayoury, A.; Lloret, F.; Julve, M.; Avarvari, N. Mono- and Binuclear Copper(II) and Nickel(II) Complexes with the 3,6-Bis(picolylamino)-1,2,4,5-Tetrazine Ligand. Molecules 2021, 26, 2122. https://doi.org/10.3390/molecules26082122

AMA Style

Stetsiuk O, El-Ghayoury A, Lloret F, Julve M, Avarvari N. Mono- and Binuclear Copper(II) and Nickel(II) Complexes with the 3,6-Bis(picolylamino)-1,2,4,5-Tetrazine Ligand. Molecules. 2021; 26(8):2122. https://doi.org/10.3390/molecules26082122

Chicago/Turabian Style

Stetsiuk, Oleh, Abdelkrim El-Ghayoury, Francesc Lloret, Miguel Julve, and Narcis Avarvari. 2021. "Mono- and Binuclear Copper(II) and Nickel(II) Complexes with the 3,6-Bis(picolylamino)-1,2,4,5-Tetrazine Ligand" Molecules 26, no. 8: 2122. https://doi.org/10.3390/molecules26082122

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