A. Riou

Synthesis, structural and spectral studies of 5-methyl 2-furaldehyde thiosemicarbazone and its Co, Ni, Cu and Cd complexes

Abstract The reaction of cobalt, nickel, copper and cadmium chlorides and bromides with 5-methylfurfural thiosemicarbazone (M5FTSC) leads to the formation of two series of new complexes: [M(M5FTSC)2X2], [M(M5FTSC)X2]. They have been characterized by spectroscopic studies (infrared, 1H NMR, and electronic spectra). The crystal structures of the free ligand M5FTSC and of the compound [CuCl2(M5FTSC)] have been determined by X-ray diffraction methods. For the Co(II), Ni(II) and Cu(II) complexes, the central atom is coordinated through the sulphur atom and the azomethine nitrogen atom whilst for the Cd(II) complexes, the coordination atoms are the sulphur and furanic oxygen atoms instead of the azomethine nitrogen.

Synthesis, structure and biological activity of nickel(II) complexes of 5-methyl 2-furfural thiosemicarbazone.

5-Methyl 2-furfuraldehyde thiosemicarbazone (M5HFTSC) with nickel(II) leads to three types of complexes: [Ni(M5HFTSC)(2)X(2)], [Ni(M5FTSC)(2)] and [Ni(M5FTSC)(2)] x 2DMF. In the first type the ligand remains in thione form, while in the two other, the anionic thiolato form is involved. The species [Ni(M5HFTSC)(2)X(2)] has been characterized spectroscopically. The structures of [Ni(M5FTSC)(2)] x 2DMF and [Ni(M5FTSC)(2)] have been solved using X-ray diffraction. Biological studies of [Ni(M5HFTSC)(2)Cl(2)] have been carried out in vitro for antifungal activity on human pathogenic fungi, Aspergillus fumigatus and Candida albicans, and in vivo for toxicity on mice. The results are compared to those of the ligand, the metal salt and a similar copper complex [Cu(M5HFTSC)Cl(2)].

(C4H3SCH2NH3)2(CH3NH3)Pb2I7 : non-centrosymmetrical crystal structure of a bilayer hybrid perovskite

The analysis of the crystal structure of (C4H3SCH2NH3)2(CH3NH3)Pb2I7, displaying a well-ordered acentric inorganic Pb2I7(3-) bilayer, is reported, and compared to the related monolayer hybrid perovskite.

A new strategy to reach highly extended and quinonoid tetrathiafulvalene (TTF) derivatives

Abstract 2,3-Bis(bromomethyl)TTFs 4 are used as precursors of 2,3-dimethylene-[2H]-TTFs 5 to reach cycloadducts of high synthetic interest via a [4+2] cycloaddition with quinonic derivatives. Subsequent Horner-Wadsworth-Emmons olefinations with a 1,3-dithiole phosphonate anion afforded highly extended and sulfur-rich analogs of tetrathiafulvalene 1.

Synthesis and Characterisation of Macrobicyclic Tetrathiafulvalene-Bridged Cage Molecules

A series of new macrobicyclic tetrathiafulvalenophanes of type 1 and 2 with three tetrathiafulvalene bridges has been prepared under high-dilution conditions using a stepwise selective protection-deprotection of tetrathiafulvalenethiolates. All the macrobicyclic tetrathiafulvalenes, along with the intermediate compounds 5 and 6 and the unexpected tetrathiafulvalene pentamers 17, were studied by cyclic voltammetry. An electrochemical investigation using the Bard-Anson equation and thin-layer cyclic voltammetry has been carried out, allowing an estimate of the number of electrons involved in each redox process of these multi-redox compounds. The X-ray crystal structure showing the unusual crystal packing of 2a is also presented.

Phosphate hydrogénophosphate de manganèse

Le compose du titre cristallise dans le systeme triclinique du groupe despace P1. Affinement de la structure jusqua 0,043. Elle se compose de polyedres [MnO 6 ], [MnO 4 (OH) 2 ] et [MnO 5 ] relies par des tetraedres [PO 3 (OH)] ou [PO 4 ] pour former une structure tridimensionnelle. Presence de groupements hydroxyle partages entre les atomes de M et P

Bis(trisubstituted tetrathiafulvalenyl) disulfides: Disulfide-bridged TTF dimers

Abstract The title compounds are synthesized, using the oxidative coupling of TTF thiolates. The disulfide linkage induces approximate orthogonality between the two TTF units, while maintaining virtually unchanged their electrochemical properties.

Hydrogénophosphate de zinc hydrate

Zn 3 [PO 3 (OH)] 3 •3H 2 O cristallise dans le systeme triclinique, groupe P1 et affinement de sa structure jusqua R=0,033. La structure contient des polyedres [ZnO 6 ] et [ZnO 5 ] lies ensemble par des tetraedres [PO 3 (OH)] pour construire des couches complexes dans le plan ab

(TTF)2[TTF(CO2H)2(CO2)2]: a wholly TTF material containing TTF radical cations and TTF derived anions

Electrooxidation of tetrathiafulvalene (TTF) carried out in the presence of (Bu4N)2TTF(CO2H)2(CO2)2 as supporting electrolyte affords wholly TTF organic materials in which TTF cations are associated with TTF(CO2H)2(CO2−)2 as counteranions.

Ammonium bismuth chromate dichromate monohydrate

NH 4 Bi(CrO 4 ) (Cr 2 O 7 )•H 2 O cristallise dans P1 avec a=6,916, b=7,249, c=10,798 A, α=80,28, β=90,52, γ=86,49 o , Z=2; affinement jusqua R=0,052. Le compose est du meme type que KBi(CrO 4 ) (Cr 2 O 7 )•H 2 O