Laurent Douce | University of Strasbourg (original) (raw)
Papers by Laurent Douce
Dalton Transactions, 2019
Cette these a pour objet la synthese et la reactivite de complexes contenant les phosphines terti... more Cette these a pour objet la synthese et la reactivite de complexes contenant les phosphines tertiaires a fonction cetone ph#2pch#2c(o)r (r=ph, (eta#5-c#5h#4)fe(eta#5-c#5h#5)) ou les enolates qui en derivent. Les complexes mer-feh si(or)#3 (co)#3 (pph#2ch#2c(o)r constituent les precurseurs polyfonctionnels utiles pour la preparation de nouveaux complexes tetranucleaires, pentanucleaires et hexanucleaires comportant les unites fe-cd et fe-cd-fe, dans lesquels le coordinat phosphine peut servir de ligand assembleur en formant un pont entre deux metaux. Le comportement eta#2-mu#2-si-o du groupe si(or)#3 a ete mis en evidence par des etudes de diffraction des rayons x. Par ailleurs, nous avons teste les proprietes coordinantes de phosphines cetone vis-a-vis de complexes carbonyles du rhenium et mis en evidence le comportement hemilabile de ces coordinats. Un autre aspect de ce travail concerne la reactivite de complexes du palladium(ii) du type (chelate)pd ph#2pch=c(o)r vis-a-vis d'un compose azo eto(o)cn=nc(o)oet. Ces enolates conduisent a de nouveaux coordinats fonctionnels resultant d'un couplage c-n entre le carbone enolique et la double liaison n=n. Le dernier chapitre de cette these decrit la premiere caracterisation cristallographique de l'anion b#2f#7#
Journal of The Chemical Society-dalton Transactions, 1992
Dalton Transactions, 2021
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
Molecular Crystals and Liquid Crystals, 2010
ABSTRACT A smectogenic 1,3-bis(4-decyloxyphenyl)-3H-imidazol-1-ium trifluoromethane sulfonates (1... more ABSTRACT A smectogenic 1,3-bis(4-decyloxyphenyl)-3H-imidazol-1-ium trifluoromethane sulfonates (1) was studied on the drift mobility of carriers by a Time-Of-Flight (TOF) technique. The transient photocurrent decay curves were clearly observed for the positive electrode illumination and the transit times could be detected to indicate the mobility in the smectic A (SmA) phase is on the order of 10−3 cm2 V−1 s−1. This carrier mobility is too fast if it is a reflection of ionic transport in this system and is more easily explained on the basis of electronic charge hopping process.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
European Journal of Organic Chemistry, 2021
New Journal of Chemistry, 2019
This article describes highly luminescent ionic compounds in liquid and crystalline states, where... more This article describes highly luminescent ionic compounds in liquid and crystalline states, where a naphthalene moiety is conjugated to an imidazolium center decorated with two different lengths of alkyl chains.
Liquid Crystals, 2011
ABSTRACT Ionic liquid Crystals constitute highly versatile materials that have drawn much interes... more ABSTRACT Ionic liquid Crystals constitute highly versatile materials that have drawn much interest these past few years in the fields of academic research and industrial development. In this respect, the present article is intended as an update of K. Binnemans review published in 2005, but focusing exclusively on the imidazolium cation - the most widely studied. Herein, imidazolium-containing thermotropic liquid crystalline materials will be sorted by molecular structure (mono-, bis-, poly-imidazolium compounds, with symmetrical and non-symmetrical structures) and discussed. Their physico-chemical properties will be exposed in order to adduce the relevancy and potential of the imidazolium platform in various fields of research.
Journal of the Iranian Chemical Society, 2007
A series of methyl 3,5-bis(3,4,5-trialkyloxybenzoylamino)-4-methylbenzoates (alkyl = CH 3 (CH 2) ... more A series of methyl 3,5-bis(3,4,5-trialkyloxybenzoylamino)-4-methylbenzoates (alkyl = CH 3 (CH 2) n-1 , n = 8, 10, 12, 14 and 16) exhibits mesomorphic behavior at temperatures between 120 and 240 ºC. The liquid crystalline properties have been characterized using differential scanning calorimetry, optical polarization microscopy and X-ray diffraction. The molecules stack in columns which pack under hexagonal symmetry. Variable temperature infra-red absorption measurements provide evidence of intermolecular hydrogen bonding between the amide entities in both the crystalline and liquid-crystalline phases.
Inorganica Chimica Acta, 1992
... 3(b). H. Hoberg, A. Ballesteros, A. Sigan, C. Jegat and A. Milchereit. Synthesis (1991), p. 3... more ... 3(b). H. Hoberg, A. Ballesteros, A. Sigan, C. Jegat and A. Milchereit. Synthesis (1991), p. 395. Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (17). 4(a). P. Braunstein, TM Gomes Carneiro, D. Matt, F. Balegroune and D. Grandjean. J. Organomet. Chem. ...
Chemical Communications, 2002
The Journal of Chemical Physics, 2018
The aim of this work is to provide a better understanding of the interface between graphite and d... more The aim of this work is to provide a better understanding of the interface between graphite and different molecular and ionic liquids. Experimental measurements of the liquid surface tension and of the graphite-liquid contact angle for sixteen ionic liquids and three molecular liquids are reported. These experimental values allowed the calculation of the solid/liquid interfacial energy that varies, for the ionic liquids studied, between 14.5 mN m 1 for 1-ethyl-3-methylimidazolium dicyanamide and 37.8 mN m 1 for 3-dodecyl-1-(naphthalen-1-yl)-1H-imidazol-3-ium tetrafluoroborate. Imidazoliumbased ionic liquids with large alkyl side-chains or functionalized with benzyl groups seem to interact more favourably with freshly peeled graphite surfaces. Even if the interfacial energy seems a good descriptor to assess the affinity of a liquid for a carbon-based solid material, we conclude that both the surface tension of the liquid and the contact angle between the liquid and the solid can be significant. Molecular dynamics simulations were used to investigate the ordering of the ions near the graphite surface. We conclude that the presence of large alkyl side-chains in the cations increases the ordering of ions at the graphite surface. Benzyl functional groups in the cations lead to a large affinity towards the graphite surface.
European Journal of Organic Chemistry, 2021
Dalton Transactions
Abrupt and hysteretic (bistable) spin-crossover (SCO) characteristics of the Fe(BPP-CN)2(X)2—X = ... more Abrupt and hysteretic (bistable) spin-crossover (SCO) characteristics of the Fe(BPP-CN)2(X)2—X = BF4 (1a–d) or ClO4 (2)—family of complexes are reported.
![Research paper thumbnail of Bistable Spin-Crossover in a New Series of [Fe(BPP-R)2] 2+ (BPP = 2,6-Bis(pyrazol-1-Yl)pyridine; R =CN) Complexes](https://attachments.academia-assets.com/67034115/thumbnails/1.jpg)
](A new series of iron(II) complexes—[Fe(BPP-CN)2](X)2, X = BF4 (1a-d) or ClO4 (2)—belonging to the... more A new series of iron(II) complexes—[Fe(BPP-CN)2](X)2, X = BF4 (1a-d) or ClO4 (2)—belonging to the [Fe(BPP-R)2]2+ (BPP = 2,6-bis(pyrazol-1-yl)pyridine) family of complexes showed abrupt and hysteretic, that is, bistable, spin-crossover (SCO) characteristics. Among the complexes, the lattice solvent-free complex 2 showed a stable and complete SCO (T1/2 = 241 K) with a thermal hysteresis width (ΔT) of 28 K, the widest ΔT so far reported for a [Fe(BPP-R)2](X)2 family of complex, showing abrupt SCO. The reproducible and bistable SCO shown by the relatively simple [Fe(BPP-CN)2](X)2 series of molecular complexes is encouraging to pursue [Fe(BPP-R)2]2+ systems for the realization of technologically relevant SCO complexes.
New Journal of Chemistry
We present an efficient Ullmann-type synthesis methodology enabling the preparation of imidazoliu... more We present an efficient Ullmann-type synthesis methodology enabling the preparation of imidazolium compounds with an extended aromatic core in three steps.
New Journal of Chemistry
Correction for ‘Luminescent imidazolium–naphthalene salts in liquid and solid states’ by Matthieu... more Correction for ‘Luminescent imidazolium–naphthalene salts in liquid and solid states’ by Matthieu L’Her et al., New J. Chem., 2019, 43, 12529–12532.
Dalton Transactions, 2019
Cette these a pour objet la synthese et la reactivite de complexes contenant les phosphines terti... more Cette these a pour objet la synthese et la reactivite de complexes contenant les phosphines tertiaires a fonction cetone ph#2pch#2c(o)r (r=ph, (eta#5-c#5h#4)fe(eta#5-c#5h#5)) ou les enolates qui en derivent. Les complexes mer-feh si(or)#3 (co)#3 (pph#2ch#2c(o)r constituent les precurseurs polyfonctionnels utiles pour la preparation de nouveaux complexes tetranucleaires, pentanucleaires et hexanucleaires comportant les unites fe-cd et fe-cd-fe, dans lesquels le coordinat phosphine peut servir de ligand assembleur en formant un pont entre deux metaux. Le comportement eta#2-mu#2-si-o du groupe si(or)#3 a ete mis en evidence par des etudes de diffraction des rayons x. Par ailleurs, nous avons teste les proprietes coordinantes de phosphines cetone vis-a-vis de complexes carbonyles du rhenium et mis en evidence le comportement hemilabile de ces coordinats. Un autre aspect de ce travail concerne la reactivite de complexes du palladium(ii) du type (chelate)pd ph#2pch=c(o)r vis-a-vis d'un compose azo eto(o)cn=nc(o)oet. Ces enolates conduisent a de nouveaux coordinats fonctionnels resultant d'un couplage c-n entre le carbone enolique et la double liaison n=n. Le dernier chapitre de cette these decrit la premiere caracterisation cristallographique de l'anion b#2f#7#
Journal of The Chemical Society-dalton Transactions, 1992
Dalton Transactions, 2021
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
Molecular Crystals and Liquid Crystals, 2010
ABSTRACT A smectogenic 1,3-bis(4-decyloxyphenyl)-3H-imidazol-1-ium trifluoromethane sulfonates (1... more ABSTRACT A smectogenic 1,3-bis(4-decyloxyphenyl)-3H-imidazol-1-ium trifluoromethane sulfonates (1) was studied on the drift mobility of carriers by a Time-Of-Flight (TOF) technique. The transient photocurrent decay curves were clearly observed for the positive electrode illumination and the transit times could be detected to indicate the mobility in the smectic A (SmA) phase is on the order of 10−3 cm2 V−1 s−1. This carrier mobility is too fast if it is a reflection of ionic transport in this system and is more easily explained on the basis of electronic charge hopping process.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
European Journal of Organic Chemistry, 2021
New Journal of Chemistry, 2019
This article describes highly luminescent ionic compounds in liquid and crystalline states, where... more This article describes highly luminescent ionic compounds in liquid and crystalline states, where a naphthalene moiety is conjugated to an imidazolium center decorated with two different lengths of alkyl chains.
Liquid Crystals, 2011
ABSTRACT Ionic liquid Crystals constitute highly versatile materials that have drawn much interes... more ABSTRACT Ionic liquid Crystals constitute highly versatile materials that have drawn much interest these past few years in the fields of academic research and industrial development. In this respect, the present article is intended as an update of K. Binnemans review published in 2005, but focusing exclusively on the imidazolium cation - the most widely studied. Herein, imidazolium-containing thermotropic liquid crystalline materials will be sorted by molecular structure (mono-, bis-, poly-imidazolium compounds, with symmetrical and non-symmetrical structures) and discussed. Their physico-chemical properties will be exposed in order to adduce the relevancy and potential of the imidazolium platform in various fields of research.
Journal of the Iranian Chemical Society, 2007
A series of methyl 3,5-bis(3,4,5-trialkyloxybenzoylamino)-4-methylbenzoates (alkyl = CH 3 (CH 2) ... more A series of methyl 3,5-bis(3,4,5-trialkyloxybenzoylamino)-4-methylbenzoates (alkyl = CH 3 (CH 2) n-1 , n = 8, 10, 12, 14 and 16) exhibits mesomorphic behavior at temperatures between 120 and 240 ºC. The liquid crystalline properties have been characterized using differential scanning calorimetry, optical polarization microscopy and X-ray diffraction. The molecules stack in columns which pack under hexagonal symmetry. Variable temperature infra-red absorption measurements provide evidence of intermolecular hydrogen bonding between the amide entities in both the crystalline and liquid-crystalline phases.
Inorganica Chimica Acta, 1992
... 3(b). H. Hoberg, A. Ballesteros, A. Sigan, C. Jegat and A. Milchereit. Synthesis (1991), p. 3... more ... 3(b). H. Hoberg, A. Ballesteros, A. Sigan, C. Jegat and A. Milchereit. Synthesis (1991), p. 395. Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (17). 4(a). P. Braunstein, TM Gomes Carneiro, D. Matt, F. Balegroune and D. Grandjean. J. Organomet. Chem. ...
Chemical Communications, 2002
The Journal of Chemical Physics, 2018
The aim of this work is to provide a better understanding of the interface between graphite and d... more The aim of this work is to provide a better understanding of the interface between graphite and different molecular and ionic liquids. Experimental measurements of the liquid surface tension and of the graphite-liquid contact angle for sixteen ionic liquids and three molecular liquids are reported. These experimental values allowed the calculation of the solid/liquid interfacial energy that varies, for the ionic liquids studied, between 14.5 mN m 1 for 1-ethyl-3-methylimidazolium dicyanamide and 37.8 mN m 1 for 3-dodecyl-1-(naphthalen-1-yl)-1H-imidazol-3-ium tetrafluoroborate. Imidazoliumbased ionic liquids with large alkyl side-chains or functionalized with benzyl groups seem to interact more favourably with freshly peeled graphite surfaces. Even if the interfacial energy seems a good descriptor to assess the affinity of a liquid for a carbon-based solid material, we conclude that both the surface tension of the liquid and the contact angle between the liquid and the solid can be significant. Molecular dynamics simulations were used to investigate the ordering of the ions near the graphite surface. We conclude that the presence of large alkyl side-chains in the cations increases the ordering of ions at the graphite surface. Benzyl functional groups in the cations lead to a large affinity towards the graphite surface.
European Journal of Organic Chemistry, 2021
Dalton Transactions
Abrupt and hysteretic (bistable) spin-crossover (SCO) characteristics of the Fe(BPP-CN)2(X)2—X = ... more Abrupt and hysteretic (bistable) spin-crossover (SCO) characteristics of the Fe(BPP-CN)2(X)2—X = BF4 (1a–d) or ClO4 (2)—family of complexes are reported.
A new series of iron(II) complexes—[Fe(BPP-CN)2](X)2, X = BF4 (1a-d) or ClO4 (2)—belonging to the... more A new series of iron(II) complexes—[Fe(BPP-CN)2](X)2, X = BF4 (1a-d) or ClO4 (2)—belonging to the [Fe(BPP-R)2]2+ (BPP = 2,6-bis(pyrazol-1-yl)pyridine) family of complexes showed abrupt and hysteretic, that is, bistable, spin-crossover (SCO) characteristics. Among the complexes, the lattice solvent-free complex 2 showed a stable and complete SCO (T1/2 = 241 K) with a thermal hysteresis width (ΔT) of 28 K, the widest ΔT so far reported for a [Fe(BPP-R)2](X)2 family of complex, showing abrupt SCO. The reproducible and bistable SCO shown by the relatively simple [Fe(BPP-CN)2](X)2 series of molecular complexes is encouraging to pursue [Fe(BPP-R)2]2+ systems for the realization of technologically relevant SCO complexes.
New Journal of Chemistry
We present an efficient Ullmann-type synthesis methodology enabling the preparation of imidazoliu... more We present an efficient Ullmann-type synthesis methodology enabling the preparation of imidazolium compounds with an extended aromatic core in three steps.
New Journal of Chemistry
Correction for ‘Luminescent imidazolium–naphthalene salts in liquid and solid states’ by Matthieu... more Correction for ‘Luminescent imidazolium–naphthalene salts in liquid and solid states’ by Matthieu L’Her et al., New J. Chem., 2019, 43, 12529–12532.