A novel 1-D square-pyramidal coordinated palladium (II) hybrid compounds [C9H16N2]PdX4 (X=Cl, Br) showing broadband emission, electrical properties and narrow optical band gap - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Journal of Solid State Chemistry Année : 2022

A novel 1-D square-pyramidal coordinated palladium (II) hybrid compounds [C9H16N2]PdX4 (X=Cl, Br) showing broadband emission, electrical properties and narrow optical band gap

H. Bouznif
  • Fonction : Auteur correspondant
F. Hajlaoui
  • Fonction : Auteur correspondant
K. Karoui
  • Fonction : Auteur
Marie Cordier
N. Zouari
  • Fonction : Auteur

Résumé

Hybrid halide perovskite-like semiconductors are attractive materials for various optoelectronic applications, from photovoltaics to smart devices. Here, two new one-dimensional palladium halides, [C9H16N2]PdCl4 (1) and [C9H16N2]PdBr4 (2) showing electrical and optical properties were prepared by reaction of 2,4,6-trimethyl-m-phenyl-enediamine with PdX2 (X ​= ​Cl, Br) in the corresponding concentrated halogen acids HX.Single-crystal X-ray diffraction analysis reveals that compounds [C9H16N2]PdX4(X ​= ​Cl,Br) belong to isostructural phases and crystallize in the orthorhombic system with non-centrosymmetric space group Pmc21. The basic unit of the crystal structure in each compound is composed of an independent [PdX4]2- anion charge balanced by a [C9H16N2]2+ cation. Remarkably, the central Pd(II) atom is coordinated by five halogen atoms PdX5 forming a distorted square-pyramidal coordination geometry. These hybrid compounds present good thermal stability up to 500 ​K. The DSC and electric measurements show that no phase transition occurs in the compounds over the temperature range 300–400 ​K. Optical absorption measurements suggest that the two hybrids Pd(II)-based metal halides have a narrow optical band gap (Eg) of ∼3.26 ​eV (X ​= ​Cl) and ∼2.98 ​eV (X ​= ​Br) which makes them promising materials in optoelectronic devices. Besides, compounds exhibit broadband green emission excited by UV light at room temperature. The electrical study shows the contribution of the grain and grain boundary in the conduction of these materials and confirms the optical result where the conductivity of the compound (1) is higher than the compound (2). The variation of the conductivity of grain confirms the activation energies calculated for the two regions. © 2022 Elsevier Inc.
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Dates et versions

hal-03691373 , version 1 (09-06-2022)

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H. Bouznif, F. Hajlaoui, K. Karoui, Nathalie Audebrand, Marie Cordier, et al.. A novel 1-D square-pyramidal coordinated palladium (II) hybrid compounds [C9H16N2]PdX4 (X=Cl, Br) showing broadband emission, electrical properties and narrow optical band gap. Journal of Solid State Chemistry, 2022, 311, pp.123149. ⟨10.1016/j.jssc.2022.123149⟩. ⟨hal-03691373⟩
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