Intercalated layered materials comprising an organic dye and inorganic MPS(3) [where M is either the manganese ion (Mn(2+)) or cadmium (Cd(2+))] phases have been prepared. The intercalation process induces a spontaneous poling, giving rise to efficiency of 750 times that urea in second-harmonic generation for derivative. In addition, derivative displays permanent magnetization below 40 kelvin. Thus, these exhibit both large optical nonlinearity magnetic ordering.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoisomerization and second harmonic generation in disperse red one-doped -functionalized poly(methyl methacrylate) filmsR. Loucif-Saibi, K. Nakatani, J. A. Delaire, M. Dumont, Z. SekkatCite this: Chem. Mater. 1993, 5, 2, 229–236Publication Date (Print):February 1, 1993Publication History Published online1 May 2002Published inissue 1 February 1993https://pubs.acs.org/doi/10.1021/cm00026a014https://doi.org/10.1021/cm00026a014research-articleACS...

Two new anil molecules exhibiting photochromism in the crystalline state, N-(4-hydroxy)-salicylidene-amino-4-(methylbenzoate) (2) and N-(3,5-di-tert-butylsalicylidene)-4-aminopyridine (3), are obtained. Upon irradiation UV, yellow crystals change color to red, owing enol-keto intramolecular tautomerism. The red disappears, when left dark or irradiated with visible light. 3 has most stable keto form among all anil-type photochromic compounds (τ = 460 days at room temperature). Both exhibit...

The new salts trans-4′-(dimethylamino)-N-R-4-stilbazolium hexafluorophosphate (R = methyl, Me 1, phenyl, Ph 2, 2,4-dinitrophenyl, DNPh 3, 2-pyrimidyl, Pym 4, Scheme 1) have been prepared. Their electronic absorption spectra show intense, visible intramolecular charge-transfer bands, the energy (Emax) of which decreases in order R > Pym. This trend arises from steadily increasing electron deficiency pyridinium ring, a phenomenon also observed cyclic voltammetric and 1H nuclear magnetic...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry and physics of the novel molecular-based compound exhibiting a spontaneous magnetization below Tc = 14 K, MnCu(obbz).cntdot.1H2O (obbz oxamidobis(benzoato)). Comparison with antiferromagnet MnCu(obbz).cntdot.5H2O. Crystal structure magnetic properties NiCu(obbz).cntdot.6H2OKeitaro Nakatani, Jean Yves Carriat, Journaux, Olivier Kahn, Francisco Lloret, Pierre Renard, Yu Pei, Jorunn Sletten, Michel VerdaguerCite this: J. Am. Chem. Soc. 1989,...

Flipping the switch: A new type of bipyridine-based ligand functionalized by phenyl- and dimethylaminophenyldithienylethene groups allows preparation photochromic dipolar zinc(II) complexes. For first time, efficient on/off photoswitching NLO response metallochromophores is observed. Supporting information for this article available on WWW under http://www.wiley-vch.de/contents/jc_2002/2008/z704138_s.pdf or from author. Please note: The publisher not responsible content functionality any...

Multiferroic materials: A novel class of multiferroics based on organic–inorganic hybrid materials is synthesized. The ferromagnetic properties originate from the coordination network, whereas ferroelectricity results polar organic ions (see picture, M=magnetization and P=polarization). Detailed facts importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by authors. Please note:...

Endowing both solvent independency and excellent thermal bistability, the benzobis(thiadiazole)-bridged diarylethene system provides an efficient approach to realize extremely high photocyclization quantum yields (Φo-c , up 90.6 %) by separating completely pure anti-parallel conformer suppressing intramolecular charge transfer (ICT).

Self-assembling molecular systems often display amplified chirality compared to the monomeric state, which makes recognition more sensitive chiral analytes. Herein, we report almost absolute enantioselective of a perylenediimide (PDI) molecule by supramolecular nanofibers bichromophoric naphthalenediimide (NDI) derivative. The was evaluated through Förster resonance energy transfer (FRET) from NDI-based host guest PDI molecules. excitation successfully transferred efficient migration along...

Abstract Controlling or switching the optical signal from a large collection of molecules with minimum photons represents an extremely attractive concept. Promising fundamental and practical applications may be derived such photon‐saving principle. With this aim in mind, we have prepared fluorescent photochromic organic nanoparticles (NPs), showing bright red emission, complete ON–OFF contrast full reversibility, excellent fatigue resistance. Most interestingly, upon successive UV visible...

Noncentrosymmetric crystals of photochromic N-salicylidene-4-bromoaniline are obtained and studied for their second-order nonlinear optical properties. Second harmonic light is generated can be seen by the naked eye. Moreover, photochromism in bulk state yields totally reversible photoswitching second intensity.

A molecule-based magnet of formula (SP)MnCr(ox)3·H2O has been synthesized, where SP+ stands for a new N-methylated pyridospiropyran cation and ox2- represents the oxalate anion. The compound orders ferromagnetically at 5.5 K exhibits crystalline-state photochromism. main spectrokinetic data UV-induced open form are strongly modified in as compared to those found (SP)I. reversible photoreaction does not modulate critical temperature long-range ferromagnetic order but modifies significant way...

A novel synthetic approach to a series of bulky triarylamines substituted by various electron-withdrawing groups and forming amorphous materials is presented. Under vacuum evaporation, thin films with high optical quality are obtained exhibit spontaneous second-order nonlinear activity. This unprecedented result likely due subtle balance between strong dipole−dipole interactions steric crowding causing self-assembly noncentrosymmetric local ordering, stable up one year.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetism of A-copper(II) bimetallic chain compounds (A = iron, cobalt, nickel): one- and three-dimensional behaviorsPetra J. Van Koningsbruggen, Olivier Kahn, Keitaro Nakatani, Yu Pei, Jean Pierre Renard, Marc Drillon, Patrick LegollCite this: Inorg. Chem. 1990, 29, 18, 3325–3331Publication Date (Print):September 1, 1990Publication History Published online1 May 2002Published inissue 1 September...

Both spirooxazine and spiropyran dyes have been embedded into two different hybrid matrices, which were formed from hydrolysis cocondensation between diethoxydimethylsilane zirconium propoxide methyldiethoxysilane (DH) triethoxysilane (TH) respectively. The nature the kinetics of photochromic response depend strongly on hydrophobic/hydrophilic balance (HHB) material. HHB controls competition direct reverse photochromism. behaviour hydrophobic spirooxazine-doped DH/TH coatings is direct,...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign of a molecular-based ferromagnet through polymerization reaction in the solid state manganeseII copperII molecular units. Crystal structure MnCu(obze)(H2O)4.cntdot.2H2O (obze = oxamido-N-benzoato-N'-ethanoato)Yu Pei, Olivier Kahn, Keitaro Nakatani, Epiphane Codjovi, Corine Mathoniere, and Jorunn SlettenCite this: J. Am. Chem. Soc. 1991, 113, 17, 6558–6564Publication Date (Print):August 1, 1991Publication History Published online1 May...

Small molecule-based amorphous materials involving unsymmetrical triarylamines exhibit multicolor emission as transparent thin films and nanoparticles under single UV wavelength excitation. Tuning of the originally stems from combined interbranch energy transfer intramolecular charge leading to blue red outputs in solid state.

An open and closed case: The photochromic bisthienylethene BTTE based on benzobisthiadiazole exhibits excellent performance in both solution single crystals (see picture). shows thermal stability, which is comparable to the widely known five-membered hexafluorocyclopentene-based counterpart. Detailed facts of importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by authors. Please...

An H2L Schiff-base ligand that was obtained from the monocondensation of diaminomaleonitrile and 4-(diethylamino)salicylaldehyde is reported together with four related nickel(II) complexes formulated as [Ni(L)(L')] (L' = MePhCHNH2, iPrNH2, Py, PPh3). Crystal structures have been solved for H2L, [Ni(L)(MePhCHNH2)], [Ni(L)(iPrNH2)]. Surprisingly, complexation process leads to formation a rather unusual nickel amido (−NH−NiII) bond by deprotonation primary amine H2L. A reduction quadratic...

Two copper(II)−gadolinium(III) metal complexes of formula CuIIGdIIILX3 are reported. H2L stands for the Schiff base ligand obtained by condensation 3,4-dimethoxysalicylaldehyde with ethylenediamine (complex 1) or 1R,2R-(+)-1,2-diphenylethylenediamine 2). While 1 reveals a centrosymmetric crystal structure, 2 crystallizes in noncentrosymmetric P212121 space group and exhibits an efficiency 0.3 time that urea second harmonic generation. Due to trend dissociation solution, molecular...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and magnetic properties of manganese-copper complex MnCu(obbz)(H2O)3.cntdot.DMF (obbz = N,N'-oxamidobis(benzoato) DMF dimethylformamide), a precursor the molecular-based magnet MnCu(obbz).cntdot.H2O with Tc 14 KFrancesc Lloret, Miguel Julve, Rafael Ruiz, Yves Journaux, Keitaro Nakatani, Olivier Kahn, Jorunn SlettenCite this: Inorg. Chem. 1993, 32, 1, 27–31Publication Date (Print):January 1993Publication History Published online1...

A novel class of photochromic materials based on polar azo derivatives containing functionalized biphenyl substituents has been synthesized. Once melt and cooled, these compounds formed amorphous transparent monomeric whose glass transition temperatures depend mainly the bulkiness substituent; by contrast, a change in polarity, evidenced absorption spectroscopy DFT calculations, exerts insignificant influence. Photoisomerization groups occurred both solution thin films; rate constants...

Photodynamics and excited-state intramolecular proton transfer (ESIPT) of N-(3,5-ditert-butylsalicylidene)-4-aminopyridine (4P) N-(3,5-ditert-butylsalicylidene)-2-aminopyridine (2P) are studied by steady-state transient optical spectroscopy in solution solid state (microcrystalline powder). These two compounds representative anils Classes A B, respectively. The results confirm that both have a similar dynamic behavior: upon excitation at 390 nm, ESIPT leads to different cis-keto* fluorescent...