Higher temperature order–disorder transition, electrical and optical properties of [N(C₂H₅)₄]₂Pd₂Cl₆compound

Abstract

[N(C2H5)4]2Pd2Cl6 hybrid compound with semiconducting character was synthetized and characterized by X‐ray diffraction, the thermal, optical and electrical properties. X‐ray diffraction indicates that the compound crystallize at room temperature in the orthorhombic system and (Immm) space group. Two endothermic peaks at, 343 K and 440 K were observed in the DSC measurements corresponding to the evaporation of water molecules and order‐disorder transition, respectively. The optical band gap (Eg = 4.34 eV) was deduced by the Tauc relation. The electrical properties was studied using the impedance spectroscopy in the frequency range of 0.1 Hz to 1 MHz and over the temperature range of 270 K to 480 K. The analysis of Nyquist plots revealed the presence of grains, grain boundaries and the electrode effects. The equivalent circuit was determined. The Ac conductivity was analyzed by the Jonsher low and the conduction mechanism was deduced based in the Elliot theory and indicate that the correlated barrier hopping model (CBH) was described the two regions II and IV and the overlapping polaron model (OLPT) the right model described the conduction in the regions I and III.

A new supramolecular semiconductor palladium(ii) complex [(CH3)3N(CH2)3Br]2Pd2Cl6: structural study, optical and electrical properties

“…For the inorganic moieties, the Pd 2+ ions are coordinated by four bridged Cl − atoms forming slightly distorted [PdCl 4 ] 2− square-planar shape and are further connected by two terminal Cl ligands to another Pd 2+ cation, forming a symmetric di-chloro-bridged dimer. The related compound [N(C 2 H 5 ) 4 ]2Pd 2 Cl 6 previously reported by I. Dakhlaoui et al 28 exhibits the same geometry. The distances between two adjacent Pd sites within the dimeric [Pd 2 Cl 6 ] 2− anions are 3.378(2) Å and 3.426(2) Å, comparable to those of other reported hybrid palladium( ii ) chloride compounds.…”

“…3b) indicates that the E g value obtained by a linear fit is equal to 2.2 eV. 41,42 This value shows the semiconductor character of the [(CH 3 ) 3 N(CH 2 ) 3 Br] 2 [Pd 2 Cl 6 ] compound and shows a smaller gap energy than other similar compounds such as [N(CH 3 ) 2 H 2 ] 2 [CoCl 4 ], 43 [(CH 3 ) 3 N(CH 2 ) 2 Br] 2 [ZnCl 4 ], 44 and [N(C 2 H 5 ) 2 ] 2 [Pd 2 Cl 6 ], 28 which are equal to 4.29 eV, 4.87 eV and 4.34 eV, respectively.…”

“…[24][25][26] Recently, new materials based on palladium have been actively investigated to understand the relationship between the structure and the physical properties. 27,28 As a part of this research on the design and synthesis of new palladium complexes with the 3-bromopropyltrimethylammonium cation, the halogen (Br) allows to create new halogen-halogen bonds between the two organic and metallic entities and makes it possible to improve the conductivity of the material. In this study, we report the synthesis, crystal structure, electrical and optical properties of a novel dimeric palladium chloride complex [(CH 3 ) 3 N(CH 2 ) 3 Br] 2 Pd 2 Cl 6 .…”

Vibrational spectroscopy, electrical, and thermal properties of [N (CH3)4][N(C2H5)4]CoCl4 compound

“…Szklarz et al had noticed that when the value of the entropy is higher than 2 J mol −1 K −1 it is usually considered as an indication of the order–disorder type of a phase transition, if lower to this value the transition is of displacive type. [ 13 ] We can conclude that the transitions occurring at T 1 and T 2 are of displacive type.…”

Supramolecular architectures of mononuclear nickel(II) and homobinuclear copper(II) complexes with the 5,5′-dimethyl-2,2′-bipyridine ligand: Syntheses, crystal structures and Hirshfeld surface analyses

“…These values clearly classify these materials among the semiconductor materials. 72,73 Fig. 15 Relative contributions of various intermolecular contacts to the Hirshfeld surface area in 1 and 2.…”