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    Cationic versus anionic Pt complex: The performance analysis of a hybrid-capacitor, DFT calculation and electrochemical properties
    (Pergamon-Elsevier Science Ltd, 2019) Akkoc, Mitat; Demirel, Serkan; Oz, Erdinc; Altin, Serdar; Bayri, Ali; Dorcet, Vincent; Roisnel, Thierry
    The synthesis and characterization of cationic versus anionic platinum(II) complex of the type [PtCl3(DMSO)](-)[NHC](+) (NHC: N-heterocyclic carbene) is reported for the first time. The complex 3 was synthesized from silver(I)-NHC2, and K-2[PtCl4] in DMSO at 80 degrees C under exclusion of light. The ionic platinum(II) complex was obtained in high yield and fully characterized by H-1, C-13, Pt-195 NMR and HRMS spectroscopy, X-ray diffraction and elemental analysis. The structural properties of the complex were investigated by using Gaussian suit and the obtained parameters were crosschecked with the X-ray data. The HOMO-LUMO energies and electrostatic surface mapping of the complex were calculated and the results were discussed with the capacitive properties of the complex. Electrochemical analysis by cyclic voltammetry (CV) of the complex shows reversible redox peaks about platinum center. The complex was used as an electrode material for the capacitor device and result is promising that the highest performance of complex 3 was found as 10.22 F/g. (C) 2018 Elsevier Ltd. All rights reserved.
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    Imidazolidinium ferrate complexes: Synthesis and catalytic properties
    (Elsevier France-Editions Scientifiques Medicales Elsevier, 2014) Demir, Serpil; Gokce, Yasemin; Roisnel, Thierry; Sortais, Jean-Baptiste; Darcel, Christophe; Ozdemir, Ismail
    The new well-defined and air stable anionic iron complexes bearing an imidazolidinium ligand (2a-d) have been synthesized and characterized by elemental analysis and single-crystal X-ray diffraction studies. Starting from FeBr2, [imidazolidinium][FeBr4] complexes 2a and 2b were prepared. The reaction of imidazolidinium chlorides with Fe(OAc)(2), followed by a recrystallization in the air led to bis(imidazolidinium) mu-oxido-bis[trichloroferrate(III)] complexes 2c and 2d. The catalytic activity of these novel complexes has been evaluated in the cross-coupling reactions of alkyl halides with Grignard reagents. (C) 2014 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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    Investigation of potential hybrid capacitor property of chelated N-Heterocyclic carbene Ruthenium(II) complex
    (Elsevier Science Sa, 2018) Akkoc, Mitat; Oz, Erdinc; Demirel, Serkan; Dorcet, Vincent; Roisnel, Thierry; Bayri, Ali; Bruneau, Christian
    The synthesis of chelated ruthenium(II) complex type Ru(eta(6)-HMB) (NHC) Cl (NHC = N-heterocyclic carbene, HMB = hexamethylbenzene) is presented. The ruthenium(II)-NHC complex 6 was obtained in good yield and was fully characterised by NMR spectroscopy, X-ray diffraction and HRMS analysis. Electrochemical analysis by cyclic voltammetry (CV) revealed reversible redox behaviour at the ruthenium centre in 6. DFT studies and the catalytic activity of complex 6 on transfer hydrogenation reaction of aryl ketones are also presented. The potential hybrid capacitor applications of Ru-NHC complex is discussed and reported firstly in the literature. It was found that the highest performance was found at 20.1 F/g, which is a promising result for energy storage applications. (c) 2018 Elsevier B.V. All rights reserved.
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    Synthesis, characterisation, crystal structure of silver and palladium N-heterocyclic carbene complexes, and investigation of their antimicrobial and catalytic activities
    (Elsevier, 2026) Kaloglu, Nazan; Yapaoz, Melda Altikatoglu; Roisnel, Thierry; Kaloglu, Murat
    In this study, three 1,3-disubstituted imidazolium salts as the N-heterocyclic carbene (NHC) precursors were synthesized. Using these salts, air- and moisture-stable three new silver-NHC complexes, and six new PEPPSI-type (PEPPSI = Pyridine Enhanced Pre-catalyst Preparation Stabilization and Initiation) palladium-NHC complexes were prepared. The structures of all compounds were fully characterized by different spectroscopic and analytical techniques. The more detailed structural characterisation of four of the palladium-NHC complexes was determined by single-crystal X-ray diffraction study. The antimicrobial activities all of the compounds were tested against human pathogenic Gram-positive (S. aureus) and Gram-negative (E. coli) bacterial strains, and fungal strain (A. niger) as potential metallopharmaceutical agents. All synthesized compounds exhibited MIC values ranging from 8 to 128 mu g/mL in antimicrobial assays, thereby confirming their effectiveness as antimicrobial agents against the tested microorganisms. Moreover, all palladium-NHC complexes were employed as catalysts in the direct arylation of nitrogen-containing five-membered heterocyclic compounds such as 3,5-dimethylisoxazole and 1-methyl-1H-pyrrole-2-carboxaldehyde with (hetero)aryl bromides. The desired arylated products were secured in moderate to good yields at 100 degrees C with a 0.5 mol% catalyst loading after just 1 h. Under the tested conditions, (hetero)aryl bromides served successfully as arylating reagents, affording selectively C4arylated isoxazoles and C5-arylated pyrroles in acceptable to high yields.