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Structural, Magnetic, Spectroscopic and Density Functional Theory (DFT) Analysis of Bis((1‐((E)‐2‐pyridinylmethylidene)semicarbazone)copper(II)sulfate) Dihydrate Complex.
Author(s) -
Soek Rafael N.,
da C. Gouveia Tiago L.,
Garbelini Ellery R.,
dos R. Crespan Estela,
Pineider Francesco,
Poneti Giordano,
Machado Guilherme S.,
Ribeiro Ronny R.,
Hörner Manfredo,
Nunes Fábio S.
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700917
Subject(s) - chemistry , semicarbazone , copper , crystallography , electron paramagnetic resonance , density functional theory , magnetic susceptibility , molecule , supramolecular chemistry , ion , paramagnetism , crystal structure , stereochemistry , nuclear magnetic resonance , computational chemistry , physics , organic chemistry , quantum mechanics
Herein we describe the synthesis, structural, spectroscopic and magnetic characterization of a new pentacoordinated bicopper(II) complex containing 2‐formylpyridine semicarbazone (HSCpy), referred as complex 1 . Each copper core is bound to one N,N,O‐ tridentate HSCpy ligand and connected to the second metal ion by two μ‐oxygen sulfato‐bridges. The compound shows an extensive association between the neutral complex molecule and water as crystallization solvate through classical N−H⋅⋅⋅O, O−H⋅⋅⋅O and, non‐classical C−H⋅⋅⋅O intermolecular hydrogen bonding generating a supramolecular 3‐D assembly in the solid state. Jahn‐Teller stabilization energies at 5144 cm −1 and spin orbit coupling constants λ=−442 cm −1 were estimated using the electronic spectra and Electron Paramagnetic Resonance data. The variable‐temperature (2‐300 K) magnetic measurements showed isotropic magnetic interaction between the two copper ions, according to the spin Hamiltonian yielding 2 J values at −0.34 cm −1 for complex 1 , in accordance with a very small antiferromagnetic interaction between copper ions kept apart by 3.24 Å. The results are compared to the thiosemicarbazone analogue.