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Structure, magnetic properties and DFT calculations of azido-copper(II) complexes with different azido-bonding, nuclearity and dimensionality

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Four bridged-azido Cu(II) complexes were synthesized and structurally characterized: [Cu-2(Et(3)en)(2)(mu(1,1)-N-3)(2)(N-3)(2)] (1), [Cu-2(ip(2)en)(2)(mu(1,1)-N-3)(2)(N-3)(2)] (2), catena-[Cu-2(Et(2)Meen)(2)(mu(1,3)-N-3)(3)]ClO4 (3) and catena-[Cu(ambza)(mu(1,1,3)-N-3)(2)] (4), where Et(3)en = N, N, N'-triethyl-1,2-diaminoethane; ip(2)en = N, N'-diisopropyl-1,2-diaminoethane; Et(2)Meen = N, N-diethyl-N'-methyl-1,2-diaminoethane; and ambza = 2-aminobenzylamine. Single crystal X-ray crystallography revealed that complexes 1 and 2 are dinuclear with doubly bridged mu(1,1)-N-3, whereas complexes 3 and 4 constitute polymeric species with an alternative sequence of single and double mu(1,3)-N-3 bridges for 3 with a 1D chain, and triple mu(1,1,3)-bridging azide in 4 with a 2D extended structure. Variable temperature magnetic susceptibilities over the temperature range of 2-298 K revealed a weak antiferromagnetic coupling (J = -1.8 cm(-1)) for 1, and a ferromagnetic coupling with J values of 7.0 and 7.7 cm(-1), respectively, for complexes 2 and 4, respectively. Compound 3 shows a new topology for Cu(II) alternating chains [Cu(1)(mu(1,3)-N-3)(2)Cu(1')]-(mu(1,3)-N-3)-[Cu(2')(mu(1,3)-N-3)(2)Cu(2 '')]-(mu(1,3)-N-3)-[Cu(1)(mu(1,3)-N-3)(2)Cu(1')]-... Three different coupling constants were obtained through a fitting procedure and by DFT calculations.

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MASSOUD, Salah s., HENARY, Maher m., MAXWELL VILLACORTA, Lindley andrés, MARTIN, Alejandro, RUIZ SABÍN, Eliseo, VICENTE CASTILLO, Ramón, FISCHER, Roland c., MAUTNER, Franz a.. Structure, magnetic properties and DFT calculations of azido-copper(II) complexes with different azido-bonding, nuclearity and dimensionality. _New Journal of Chemistry_. 2018. Vol. 42, núm. 4, pàgs. 2627-2639. [consulta: 5 de maig de 2026]. ISSN: 1144-0546. [Disponible a: https://hdl.handle.net/2445/154820]

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