0000000001305770
AUTHOR
Abdeslem Bentama
showing 26 related works from this author
Copper(II) complexes with 2,5-bis(2-pyridyl)pyrazine and oxalate and croconate: Synthesis, crystal structure and magnetic properties
2012
Abstract Two new copper(II) complexes of formula [Cu2(2,5-dpp)(C2O4)2(H2O)4] (1) and [Cu2(2,5-dpp)(C5O5)2(H2O)4]·3H2O (2) [2,5-dpp = 2,5-bis(2-pyridyl)pyrazine, C2O42− = oxalate and C5O52− = croconate (dianion of 4,5-dihydroxycyclopent-4-ene-1,2,3-trione)] have been prepared and their structures determined by X-ray crystallographic methods. Compounds 1 and 2 are dinuclear complexes where the 2,5-dpp molecule acts as a bis-bidentate bridge between the two copper(II) ions, the electroneutrality being achieved by the presence of bidentate oxalate (1) and croconate (2) ligands. Each copper(II) ion exhibits an elongated octahedral CuN2O4 environment with two nitrogen atoms from 2,5-dpp and two o…
Dicopper(II) Metallacyclophanes with Oligo(p-phenylene-ethynylene) Spacers: Experimental Foundations and Theoretical Predictions on Potential Molecul…
2013
Two novel double-stranded dicopper(II) metallacyclophanes of formula (nBu4N)4[Cu2(dpeba)2]·4MeOH·2Et2O (1) and (nBu4N)4[Cu2(tpeba)2]·12H2O (2) have been prepared by the Cu(II)-mediated self-assembly of the rigid ('rod-like') bridging ligands N,N'-4,4'-diphenylethynebis(oxamate) (dpeba) and N,N'-1,4-di(4-phenylethynyl)phenylenebis(oxamate) (tpeba), respectively. Single crystal X-ray diffraction analysis of 1 confirms the presence of a dicopper(II)tetraaza[3.3]4,4'-diphenylethynophane metallacyclic structure featuring a very long intermetallic distance between the two square planar Cu(II) ions [r = 14.95(1) Å]. The overall parallel-displaced π-stacked conformation of the two nearly planar par…
Magneto-structural correlations in Ni(ii) [2 × 2] metallogrids featuring a variable number of μ-aquo or μ-hydroxo extra bridges
2019
Four new [2 × 2] grid-type metallosupramolecular species have been obtained by using the ditopic 3,6-bis(2′-pyridyl)pyridazine ligand (dppn) and nickel(II) salts containing poorly coordinating anions. Three of them have the formula [Ni4(μ-dppn)4(μ-OH)2(μ-H2O)2]X6·nH2O [with X = ClO4− (1), NO3− (2) and CF3SO3− (3), and n = 6.5 (1), 14 (2) and 4 (3)]. Their crystal structure shows the same tetranuclear core, constituted by four six-coordinate metal ions and four dppn molecules. Two hydroxo groups and two water molecules efficiently interact forming two hydrated hydroxide (H3O2−) supramolecular bridging anions, further stabilizing the grid. The other compound, [Ni4(μ-dppn)4(μ-OH)3(μ-H2O)](ClO4…
Ligand effects on the structures and magnetic properties of tricyanomethanide-containing copper(II) complexes.
2007
The preparation, crystal structure and magnetic properties of four heteroleptic copper(II) complexes with the tricyanomethanide (tcm(-)) and the heterocyclic nitrogen donors 3,6-bis(2-pyridyl)pyridazine (dppn), 2,5-bis(2-pyridyl)pyrazine (2,5-dpp), 2,3-bis(2-pyridyl)pyrazine (2,3-dpp) and 2,3-bis(2-pyridyl)quinoxaline (2,3-dpq) are reported, {[Cu(2)(dppn)(OH)(tcm)(2)] x tcm}(n) (1), {[Cu(2,5-dpp)(tcm)] x tcm}(n) (2), {[Cu(2)(2,3-dpp)(2)(tcm)(3)(H(2)O)(0.5)] x tcm x 0.5H(2)O}(n) (3) and [Cu(2,3-dpq)(tcm)(2)](n) (4). 1 has a ladder-like structure with single mu-1,5-tcm ligands forming the sides and a bis-bidentate dppn and a single mu-hydroxo providing the rung. Each copper atom in 1 exhibits…
Supramolecular arrangements of novel clickable 4-substituted 3,6-bis(2′-pyridyl)pyridazine molecules
2020
Abstract The clickable reaction between the starting 3,6-bis(2′-pyridyl)-1,2,4,5-tetrazine (bptz) with a series of terminal alkynes-containing functional biomolecules [prop-2-yn-1-ol, 4-(prop-2′-yn-1′-yl)morpholine and D-galactose] by means of an inverse electron demand Diels-Alder pathway has been studied and four new 4-substituted 3,6-bis(2′-pyridyl)pyridazine derivatives (4-Rdppn) were isolated, namely 4-(hydroxymethyl)-3,6-di(pyridin-2-yl)pyridazine (1), 4-((prop-2-yn-1-yloxy)methyl)-3,6-di(pyridin-2-yl)pyridazine (2) obtained by post-etherification reaction of 1, 4-(morpholinemethyl)-(3,6-dipyridin-2-yl)pyridazine monohydrate (3) and 3,6-di(pyridin-2-yl)-4-((2,2,7,7-tetramethyltetrahyd…
Synthesis and characterization of new 1,4 and 1,5-disubstituted glucopyranosyl 1,2,3-triazole by 1,3-dipolar cycloaddition
2009
Abstract A series of 1,4 and 1,5-disubstituted 1-(β- d -glucopyranosyl)-1,2,3-triazoles has been prepared in an efficient manner with excellent yields using the intermolecular 1,3-dipolar cycloaddition of 1-azido-2,3,4,6-tetra-O-acetyl-β- d -glucopyranose 2 to a variety of substituted alkynes phenylacethylene 3, propargyl alcohol 4, 2-butyn-1,4-diol, 5, 3-propargylbenzimidazole 6 and propargylpyrazole 7 in toluene. The reaction takes place with the formation of both 4- and 5-regioisomers.
Efficient ultraviolet-light energy dissipation by an aromatic ketone.
2010
Experimental evidence on the efficiency of 2,2'4,4'-tetramethoxybenzil for UV-light energy dissipation is provided. This non-phenolic aromatic ketone has a low energy triplet which quickly decays to the ketone ground state, thus avoiding the generation of undesirable reactive species. El Moncef, Abdelkarim, elmonab@alumni.uv.es ; Cuquerella Alabort, Maria Consuelo, Chelo.Cuquerella@uv.es ; Zaballos Garcia, Elena, Elena.Zaballos@uv.es ; Ramirez de Arellano Sanchez, Maria del Carmen, Carmen.Ramirezdearellano@uv.es ; Stiriba, Salah Eddine, Salah.Stiriba@uv.es ; Perez Prieto, Julia, Julia.Perez@uv.es
Pyrene-benzoylthiophene exciplexes as selective catalysts for the [2+2] cycloaddition between cyclohexadiene and styrenes.
2007
Efficient intramolecular fluorescence quenching in pyrene−benzoylthiophene systems leads to formation of exciplexes. These species interact with 1,3-cyclohexadiene (or styrenes), leading to reactive excited triplexes. The overall process affords [2+2] cross-cycloadducts with an average yield of 57%.
Chromium(III) complexes with 2-(2′-pyridyl)imidazole: Synthesis, crystal structure and magnetic properties
2011
Abstract The preparation, crystal structure and variable temperature-magnetic investigation of three 2-(2′-pyridyl)imidazole-containing chromium(III) complexes of formula PPh4[Cr(pyim)(C2O4)2]·H2O (1), AsPh4[Cr(pyim)(C2O4)2]·H2O (2) and [Cr2(pyim)2(C2O4)2(OH2)2]·2pyim · 6H2O (3) [pyim = 2-(2′-pyridyl)imidazole, C 2 O 4 2 - = dianion of oxalic acid , PPh 4 + = tetraphenylphosphonium cation and AsPh 4 + = tetraphenylarsonium cation ] are reported herein. The isomorphous compounds are made up of discrete [Cr(pyim)(C2O4)2]− anions, XPh 4 + cations [X = P (1) and As (2)] and uncoordinated water molecules. The chromium environment in 1 and 2 is distorted octahedral with Cr–N and Cr–O bond distanc…
A novel octacyanido dicobalt(iii) building block for the construction of heterometallic compounds
2019
The first bimetallic octacyanido complex of CoIII, (PPh4)2[Co2(μ-2,5-dpp)(CN)8] (1), was synthesized and used as a metalloligand with [Mn(MAC)(H2O)2]Cl2·4H2O to give a new {CoIIIMnII} heterometallic chain of formula [MnII(MAC)(μ-NC)2Co2III(μ-2,5-dpp)(CN)6]n·7nH2O (2) (PPh4+ = tetraphenylphosphonium cation; 2,5-dpp = 2,5-bis(2-pyridyl)pyrazine and MAC = 2,13-dimethyl-3,6,9,12,18-pentaazabicyclo-[12.3.1]octadeca-1(18),2,12,14,16-pentaene). Both compounds were characterized by single-crystal X-ray diffraction. Compound 1 contains a diamagnetic 2,5-dpp-bridged dicobalt(III) unit with four peripheral cyanide ligands at each cobalt center achieving a six-coordinate surrounding, the electroneutral…
Copper(II) complexes with 2,5-bis(2-pyridyl)pyrazine and 1,1,3,3-tetracyano-2-ethoxypropenide anion: Syntheses, crystal structures and magnetic prope…
2009
International audience; The copper(II) complexes of formula [Cu2(2,5-dpp)(H2O)4(CF3SO3)4] · 2H2O (1) and [Cu2(2,5-dpp)(H2O)2(tcnoet)4]n (2) [2,5-dpp = 2,5-bis(2-pyridyl)pyrazine and tcnoet− = 1,1,3,3-tetracyano-2-ethoxypropenide anion] have been prepared and their structures determined by X-ray crystallographic methods. Compound 1 is a dinuclear complex where the 2,5-dpp molecule acts as a bis-bidentate bridge between the two copper centers, the electroneutrality being achieved by four terminally bound triflate anions. Each copper(II) ion presents an elongated octahedral CuN2O4 environment with two nitrogen atoms from 2,5-dpp and two water molecules in the basal plane and two triflate-oxyge…
Coordination isomerism in spin crossover (SCO) materials
2021
International audience; A new series of three spin crossover (SCO) Fe(II) complexes based on a cyanocarbanion and on the neutral quinolin-8-amine (aqin) ligands, [Fe(aqin)2(tcnsme)2] (1), [Fe(aqin)2(tcnset)2] (2), and [Fe(aqin)2(tcnspr)2] (3), has been studied. The three complexes display similar molecular structures consisting of discrete [Fe(aqin)2(tcnsR)2] complexes [R = Me (1), Et (2), and Pr (3)]. Infrared spectroscopy and magnetic studies, performed on the three complexes, revealed the presence of similar SCO behaviors which strongly differ by their transition temperatures [234 K (1) < 266 K (2) < 360 K (3)]. The increase of the transition temperatures when passing from 1 to 3 may be …
CCDC 2045407: Experimental Crystal Structure Determination
2021
Related Article: Emmelyne Cuza, Rachid Motei, Fatima Setifi, Abdeslem Bentama, Carlos J. Gómez-García, Smail Triki|2021|J.Appl.Phys.|129|145501|doi:10.1063/5.0046055
CCDC 1874222: Experimental Crystal Structure Determination
2019
Related Article: Nadia Marino, Rosaria Bruno, Abdeslem Bentama, Alejandro Pascual-Álvarez, Francesc Lloret, Miguel Julve, Giovanni De Munno|2019|CrystEngComm|21|917|doi:10.1039/C8CE01894D
CCDC 1892383: Experimental Crystal Structure Determination
2019
Related Article: Maria-Gabriela Alexandru, Nadia Marino, Diana Visinescu, Giovanni De Munno, Marius Andruh, Abdeslem Bentama, Francesc Lloret, Miguel Julve|2019|New J.Chem.|43|6675|doi:10.1039/C9NJ00420C
CCDC 1868872: Experimental Crystal Structure Determination
2019
Related Article: Nadia Marino, Rosaria Bruno, Abdeslem Bentama, Alejandro Pascual-Álvarez, Francesc Lloret, Miguel Julve, Giovanni De Munno|2019|CrystEngComm|21|917|doi:10.1039/C8CE01894D
CCDC 1868871: Experimental Crystal Structure Determination
2019
Related Article: Nadia Marino, Rosaria Bruno, Abdeslem Bentama, Alejandro Pascual-Álvarez, Francesc Lloret, Miguel Julve, Giovanni De Munno|2019|CrystEngComm|21|917|doi:10.1039/C8CE01894D
CCDC 1977986: Experimental Crystal Structure Determination
2020
Related Article: Mouad Filali, El Mestafa El Hadrami, Rosaria Bruno, Giovanni De Munno, Abdeslem Bentama, Miguel Julve, Salah-Eddine Stiriba|2020|J.Mol.Struct.|1217|128420|doi:10.1016/j.molstruc.2020.128420
CCDC 2046063: Experimental Crystal Structure Determination
2021
Related Article: Emmelyne Cuza, Rachid Motei, Fatima Setifi, Abdeslem Bentama, Carlos J. Gómez-García, Smail Triki|2021|J.Appl.Phys.|129|145501|doi:10.1063/5.0046055
CCDC 2045406: Experimental Crystal Structure Determination
2021
Related Article: Emmelyne Cuza, Rachid Motei, Fatima Setifi, Abdeslem Bentama, Carlos J. Gómez-García, Smail Triki|2021|J.Appl.Phys.|129|145501|doi:10.1063/5.0046055
CCDC 1892384: Experimental Crystal Structure Determination
2019
Related Article: Maria-Gabriela Alexandru, Nadia Marino, Diana Visinescu, Giovanni De Munno, Marius Andruh, Abdeslem Bentama, Francesc Lloret, Miguel Julve|2019|New J.Chem.|43|6675|doi:10.1039/C9NJ00420C
CCDC 2045404: Experimental Crystal Structure Determination
2021
Related Article: Emmelyne Cuza, Rachid Motei, Fatima Setifi, Abdeslem Bentama, Carlos J. Gómez-García, Smail Triki|2021|J.Appl.Phys.|129|145501|doi:10.1063/5.0046055
CCDC 1868873: Experimental Crystal Structure Determination
2019
Related Article: Nadia Marino, Rosaria Bruno, Abdeslem Bentama, Alejandro Pascual-Álvarez, Francesc Lloret, Miguel Julve, Giovanni De Munno|2019|CrystEngComm|21|917|doi:10.1039/C8CE01894D
CCDC 1868874: Experimental Crystal Structure Determination
2019
Related Article: Nadia Marino, Rosaria Bruno, Abdeslem Bentama, Alejandro Pascual-Álvarez, Francesc Lloret, Miguel Julve, Giovanni De Munno|2019|CrystEngComm|21|917|doi:10.1039/C8CE01894D
CCDC 1977987: Experimental Crystal Structure Determination
2020
Related Article: Mouad Filali, El Mestafa El Hadrami, Rosaria Bruno, Giovanni De Munno, Abdeslem Bentama, Miguel Julve, Salah-Eddine Stiriba|2020|J.Mol.Struct.|1217|128420|doi:10.1016/j.molstruc.2020.128420
CCDC 1977985: Experimental Crystal Structure Determination
2020
Related Article: Mouad Filali, El Mestafa El Hadrami, Rosaria Bruno, Giovanni De Munno, Abdeslem Bentama, Miguel Julve, Salah-Eddine Stiriba|2020|J.Mol.Struct.|1217|128420|doi:10.1016/j.molstruc.2020.128420