Comparitive study on structural, magnetic and spectroscopic properties of four new copper(II) coordination polymers with 4′-substituted terpyridine ligands

Dominique Toledo, Andrés Vega, Nancy Pizarro, Ricardo Baggio, Octavio Peña, Thierry Roisnel, Jean Yves Pivan, Yanko Moreno

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

5 Citas (Scopus)

Resumen

The synthesis and characterization of four copper(II) complexes with different terpyridyl ligands have been carried out, their crystal and molecular structures determined and their magnetic and luminescent properties analyzed. The ligands used in the coordination reactions were 4′-(3-methyl-2-thienyl)-4,2′:6′,4''-terpyridine (4-stpy), -4′-(4-quinolinyl)-4,2′:6′,4''-terpyridine (4-qtpy), 4′-(4-quinolinyl)-3,2′:6′,3''-terpyridine (3-qtpy, unreported so far) and 4′-(4-cyanophenyl)-4,2′:6′,4''-terpyridine (4-cntpy); the reaction of these ligands with Cu(II)-hexafluoroacetylacetone (Cu(hfacac)2) gives rise to coordination polymers Cu(4-stpy)(hfacac)2 (I), Cu(4-qtpy)(hfacac)2 (II), Cu(3-qtpy)(hfacac)2 (III) and Cu(4-cntpy)(hfacac)2 (IV). The different location of the nitrogen atom of the outer ring is responsible for the different coordination modes. The emission spectra of dichloromethane solutions are consistent with dissociation of the complexes; the emission maxima simulate those of the free ligands. The emission of I, III and IV in the solid state is essentially quenched upon complexation with Cu(II), whereas for compound II an emission at 420 nm is observed. The interaction between copper centers has been related with the coplanarity of terpyridine rings. Complexes I–III exhibit a paramagnetic behavior, while compound IV, with the smallest torsion angle between pyridine moieties, shows an antiferromagnetic behavior described by a dimeric model, with J=−4.38 cm−1, g =2.06 and ρ=0.07.

Idioma originalInglés
Páginas (desde-hasta)78-88
Número de páginas11
PublicaciónJournal of Solid State Chemistry
Volumen253
DOI
EstadoPublicada - sep 2017

Áreas temáticas de ASJC Scopus

  • Materiales electrónicos, ópticos y magnéticos
  • Cerámicos y compuestos
  • Física de la materia condensada
  • Química física y teórica
  • Química inorgánica
  • Química de los materiales

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