Tag: M.W=350-400

Arashiba, Kazuya published the artcileSynthesis and Protonation of Molybdenum- and Tungsten-Dinitrogen Complexes Bearing PNP-Type Pincer Ligands, Safety of 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, the publication is Organometallics (2012), 31(5), 2035-2041, database is CAplus.

Novel molybdenum- and tungsten-dinitrogen complexes bearing PNP-type pincer ligands are prepared and characterized by x-ray anal. Reactions of these molybdenum- and tungsten-dinitrogen complexes with an excess amount of sulfuric acid in THF at room temperature afford ammonia and hydrazine in good yields.

Organometallics published new progress about 338800-13-8. 338800-13-8 belongs to pyridine-derivatives, auxiliary class Bis-phosphine Ligands, name is 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, and the molecular formula is C23H43NP2, Safety of 2,6-Bis((di-tert-butylphosphino)methyl)pyridine.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Kamogawa, Hiroyoshi published the artcileOrganic solid photochromism by photoreduction mechanism: aryl viologens embedded in poly(N-vinyl-2-pyrrolidone), SDS of cas: 47369-00-6, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (1988), 26(2), 653-6, database is CAplus.

The reversible photocolor development (photochromism) is reported of N,N‘-diaryl-γ,γ’-dipyridylium dichlorides (aryl viologens) in a poly(N-vinyl-2-pyrrolidone) matrix. Green colors appeared in this case because of the extension of delocalization of electrons of the cation radical caused by the conjugation of aryl groups. Sensitivities to UV light were generally higher than those of conventional benzyl-type viologens.

Journal of Polymer Science, Part A: Polymer Chemistry published new progress about 47369-00-6. 47369-00-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Salt,Benzene,Organic ligands for MOF materials,Nitrogen containing MOF ligands,Nitrogen containing MOF ligands, name is 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, and the molecular formula is C22H18Cl2N2, SDS of cas: 47369-00-6.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Kamogawa, Hiroyoshi published the artcileRedox photochromism of arylviologen crystals, Synthetic Route of 47369-00-6, the publication is Bulletin of the Chemical Society of Japan (1991), 64(1), 321-3, database is CAplus.

Reversible color development induced by near-UV light (photochromism) was observed for some crystalline powder of 1,1′-diaryl-4,4′-bipyridinium bis(p-toluenesulfonate). Redox mechanism by the electron transfer from the sulfonate anion to viologen dication is claimed.

Bulletin of the Chemical Society of Japan published new progress about 47369-00-6. 47369-00-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Salt,Benzene,Organic ligands for MOF materials,Nitrogen containing MOF ligands,Nitrogen containing MOF ligands, name is 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, and the molecular formula is C22H18Cl2N2, Synthetic Route of 47369-00-6.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Sharma, G. D. published the artcileStudies on electrical and photoelectrical behavior of ITO/ArV/In Schottky barrier device, Quality Control of 47369-00-6, the publication is Synthetic Metals (1999), 106(2), 97-105, database is CAplus.

The elec. and photoelec. properties of aryl viologen (ArV), chem. known as 1,1′-diphenyl-4,4′-bipyridinium dichloride, in the form of thin film, sandwiched between ITO and In electrode were studied. Current-voltage (J-V) characteristics in the dark show the rectification effect due to the formation of a Schottky barrier at the In-ArV interface. The diode quality factor of the device, greater than unity, indicates the recombination of electron-hole in depletion region. Ohmic conduction in the low-voltage range and space-charge-limited conduction (SCLC) controlled by an exponential distribution of traps above the valence band edge, for the higher voltage region, have been observed Various elec. parameters were calculated from an anal. of the J-V and capacitance-voltage characteristics at different temperatures, and are discussed in detail. At higher frequencies, the device exhibits voltage-independent capacitance, which is explained in terms of the extremely slow kinetics of space charge and low mobility of charge carriers. The photoaction spectra of the device and absorption spectra of the ArV thin film reveal that the fraction of light, which is absorbed near or within the diffusion length of the exciton, is responsible for producing the free charge carriers. The photovoltaic parameters were calculated from the J-V characteristics under illumination through ITO and discussed in detail.

Synthetic Metals published new progress about 47369-00-6. 47369-00-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Salt,Benzene,Organic ligands for MOF materials,Nitrogen containing MOF ligands,Nitrogen containing MOF ligands, name is 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, and the molecular formula is C11H14O2, Quality Control of 47369-00-6.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Sharma, G. D. published the artcileCharge conduction process and photovoltaic effect in ITO/ArV/CHR/In p-n junction device, Application of 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, the publication is Synthetic Metals (2001), 124(2-3), 399-405, database is CAplus.

The present communication deals with the designing of a new p-n junction device made with 4,4′-aryl bipyridine, also known as aryl viologen (ArV), a p-type organic semiconductor and 3-diazophenyl, 4,5 dihydroxynaphthalene, 2,7 disulfonic acid, disodium salt, commonly known as chromotrope 2R (CHR), a n-type organic semiconductor. The elec. and photoelec. properties of the fabricated p-n junction having configuration ITO/ArV/CHR/In was studied by analyzing its current-voltage (J-V) characteristics, capacitance-voltage (C-V) characteristics in the dark and photoaction spectra. The anal. of dark current-voltage (J-V) characteristics at room temperature was presented to elucidate the conduction mechanisms and to evaluate the device parameters. The charge transport conduction mechanism in forward biased condition in the low voltage region is described by the modified Shockley effect. For biases >1.0 V, the dark current is a space charge limited current (SCLC) in the presence of exponentially distributed traps. The variation of 1/C² with voltage also shows the straight line at low frequency indicating the formation of p-n junction between ArV and CHR and the potential barrier height is âˆ?.18 eV at room temperature which decreases with the increase in temperature The comparison of photoaction spectra with absorption spectra of the ArV-CHR layer reveals that photocurrent in this device is due to the generation of excitons both in ArV and CHR. The excitons generated in ArV dissociated by electron transfer to CHR and those created in CHR are ionized by hole transfer to the ArV. This charge transfer may be driven by the offset between the electron affinities and ionization potentials of two semiconductors.

Synthetic Metals published new progress about 47369-00-6. 47369-00-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Salt,Benzene,Organic ligands for MOF materials,Nitrogen containing MOF ligands,Nitrogen containing MOF ligands, name is 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, and the molecular formula is C3H3Br2ClO, Application of 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Biedermann, Frank published the artcileCucurbit[8]uril Mediated Donor-Acceptor Ternary Complexes: A Model System for Studying Charge-Transfer Interactions, Name: 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, the publication is Journal of Physical Chemistry B (2012), 116(9), 2842-2849, database is CAplus and MEDLINE.

A supramol. self-assembly approach is described which allows for the convenient preparation of a wide range of charge-transfer (CT) donor-acceptor complexes in aqueous solutions When one equiv of the macrocyclic host cucurbit[8]uril (CB[8]) is added to an aqueous donor and acceptor solution, a heteroternary complex forms inside the host’s cavity with a well-defined face-to-face π-π-stacking geometry of the donor and acceptor. This heteroternary, CB[8]-mediated complex offers the opportunity to study the CT phenomena at low concentrations and free from complications arising from any donor-donor and acceptor-acceptor interactions as a result of the large binding affinities and the very high selectivity over the formation of these homoternary complexes. Thus, this supramolocular self-assembly strategy is a practical donor-acceptor mix-and-match approach with synthetic advantages over much more cumbersome tethering schemes. While the characteristic UV/vis features of a few CB[8] ternary systems had been described as a CT band, we present for the first time systematic evidence for the existence of CT interactions between several donor-acceptor pairs that are mediated by the host CB[8]. Correlation of the exptl. obtained CT λ_max to computed HOMO-LUMO energies demonstrated that the CT process in the host’s cavity can be described by the Mulliken model. Furthermore, the literature claim of a “CT driving force” for the formation of CB[8] ternary complexes was scrutinized and evaluated by calorimetric (ITC) and ESI-MS measurements. The findings indicated that neither in the aqueous medium nor in the “gas-phase” is CT of energetic relevance to the Gibbs free binding energy. In contrast, electrostatic considerations combined with solvation effects are much better suited to rationalize the observed trends in binding affinities. Addnl., the CT λ_max was found to be much more red-shifted (â‰?5 nm) inside the CB[8] cavity than in any polar organic solvents or water, indicating a significant stabilization of the CT excited state within the host cavity, further demonstrating the unique electrostatic, polar properties of the host cavity.

Journal of Physical Chemistry B published new progress about 47369-00-6. 47369-00-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Salt,Benzene,Organic ligands for MOF materials,Nitrogen containing MOF ligands,Nitrogen containing MOF ligands, name is 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, and the molecular formula is C22H18Cl2N2, Name: 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Higashi, Tomohiro published the artcileDiphenyl Viologen on an HOPG Electrode Surface: Less Sharp Redox Wave than Dibenzyl Viologen, Safety of 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, the publication is Langmuir (2013), 29(36), 11516-11524, database is CAplus and MEDLINE.

Redox behavior of di-Ph viologen (dPhV) on a basal plane of a highly oriented pyrolytic graphite (HOPG) electrode was described using the results of voltammetric and electroreflectance measurements. Its characteristics were compared to those of dibenzyl viologen (dBV), which undergoes the 1st-order faradaic phase transition. Unlike dBV, dPhV-dication (dPhV²⁺) was found to take a strongly adsorbed state on an HOPG surface. This is due to much stronger π-π interaction between Ph rings of dPhV²⁺ and HOPG surface than between benzyl groups of dBV²⁺ and the surface. The participation of this strongly adsorbed dPhV²⁺ in the redox process can be avoided by (1) a shorter than âˆ? min time period elapsing from touching a freshly cleaved HOPG surface to dPhV solution until the start of potential scan, (2) complete equilibration at the electrode potentials at which superficial dPhV mols. are fully reduced, or (3) multiple cyclic potential scanning to repeat oxidation-reduction of adsorbed species. Even in such conditions, although voltammograms of thin-layer electrochem. for the surface-confined dPhV^â€?/dPhV²⁺ couple were obtained with peak widths being as narrow as those of dBV, it is not the 1st-order phase transition. The participation of strongly adsorbed dPhV²⁺ mols. results in another new voltammetric feature with a broader peak. The film formed by strongly adsorbed dPhV²⁺ was hydrophilic, whereas dBV²⁺ does not form such a film but only a gas-like layer. Measurements using XPS confirmed that the film consists of dPhV²⁺ with coexistent H₂O. These results reveal a typical case that delicate interaction balance among V²⁺, V^â€?, and electrode surface determines whether the two-dimensional 1st-order transition takes place or not.

Langmuir published new progress about 47369-00-6. 47369-00-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Salt,Benzene,Organic ligands for MOF materials,Nitrogen containing MOF ligands,Nitrogen containing MOF ligands, name is 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, and the molecular formula is C22H18Cl2N2, Safety of 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Smith, Ashleigh D. published the artcileSynthesis, characterization and reactivity of iron- and cobalt-pincer complexes, Related Products of pyridine-derivatives, the publication is Polyhedron (2016), 286-291, database is CAplus.

The ^tBuPONOP (2,6-bis(di-tert-butylphosphinito)pyridine) complexes of iron and cobalt, (^tBuPONOP)FeCl₂ (1) and (^tBuPONOP)CoCl₂ (2), were prepared Both complexes are paramagnetic and the solid-state structures of 1 and 2 were determined by single crystal x-ray diffraction studies. Analogous Fe and Co complexes of the ^tBuPNP (2,6-bis(di-tert-butyl-phosphinomethyl)pyridine) ligand (3 and 4, resp.) were prepared to allow comparison between the closely related pincer ligands in the hydrosilylation of carbonyl moieties. All four complexes are catalytically active when treated with NaBEt₃H, which was assumed to generate a metal-hydride species in-situ.

Polyhedron published new progress about 338800-13-8. 338800-13-8 belongs to pyridine-derivatives, auxiliary class Bis-phosphine Ligands, name is 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, and the molecular formula is C5H10O, Related Products of pyridine-derivatives.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Vogt, Matthias published the artcileAnionic Nickel(II) Complexes with Doubly Deprotonated PNP Pincer-Type Ligands and Their Reactivity toward CO₂, Category: pyridine-derivatives, the publication is Organometallics (2013), 32(1), 300-308, database is CAplus.

The aromatization-dearomatization reaction of pincer-type complexes prompted by protonation-deprotonation of the pincer “arm” is a key step in bond activation chem. and atom-economic catalytic transformations. However, the possibility of double deprotonation of ancillary pincer ligands is rarely discussed in the literature. Here authors report on square-planar cationic nickel(II) complexes of PNP^R type ligands (PNP = 2,6-bis[(dialkylphosphino)methyl]pyridine with R = ⁱPr, ^tBu), which can be readily transformed into the doubly deprotonated anionic species. The complexes [Ni(PNP^R)Cl]Cl (3, R = ⁱPr; 4, R = ^tBu) are readily prepared from the reaction of NiCl₂·6H₂O and the PNP^R ligand in THF. Treatment of the cationic chloro complexes 3 and 4 with 2 equivalent of MeLi gives the nickel(II) Me complexes [Ni(PNP^R*)Me] (7, R = ⁱPr; 8, R = ^tBu), the asterisk indicates the deprotonated pincer arm. Reaction of 7 and 8 with an addnl. 1 equivalent of MeLi gives the anionic complexes [Li(DME)₃][Ni(PNP^iPr**)Me] (9-DME, DME = 1,2-dimethoxyethane) and [Li(Et₂O)₂][Ni(PNP^tBu**)(Me)] (10-Et₂O), resp. Single-crystal x-ray diffraction studies exhibit doubly deprotonated PNP-pincer ligands coordinated to a nickel(II) center. DFT calculations, as well as multinuclear NMR spectroscopy and the x-ray structures, suggest a conjugated π-system with delocalization of the neg. charge throughout the carbon backbone of the pincer ligand. The electrophilic attack of complex 9 by CO₂ and tautomerization gives [Li][Ni(PNP^iPr*-COO)(Me)] (11). The dearomatized complex that is formed contains an exocyclic methylene carbon atom and a carboxylate moiety adjacent to the second pincer arm.

Organometallics published new progress about 338800-13-8. 338800-13-8 belongs to pyridine-derivatives, auxiliary class Bis-phosphine Ligands, name is 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, and the molecular formula is C21H20BrNO4S, Category: pyridine-derivatives.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Latini, Alessandro published the artcileA novel water-resistant and thermally stable black lead halide perovskite, phenyl viologen lead iodide C₂₂H₁₈N₂(PbI₃)₂, Safety of 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, the publication is Dalton Transactions (2020), 49(8), 2616-2627, database is CAplus and MEDLINE.

A novel black organoammonium iodoplumbate semiconductor, namely Ph viologen lead iodide C₂₂H₁₈N₂(PbI₃)₂ (PhVPI), was successfully synthesized and characterized. This material showed phys. and chem. properties suitable for photovoltaic applications. Indeed, low direct allowed band gap energy (E_g = 1.32 eV) and high thermal stability (up to at least 300°) compared to methylammonium lead iodide CH₃NH₃PbI₃ (MAPI, E_g = 1.5 eV) render PhVPI potentially attractive for solar cell fabrication. The compound was extensively characterized by x-ray diffraction (performed on both powder and single crystals), UV-visible diffuse reflectance spectroscopy (UV-visible DRS), UV-photoelectron spectroscopy (UPS), FTIR spectroscopy, TG-DTA, and CHNS anal. Reactivity towards water was monitored through x-ray powder diffraction carried out after prolonged immersion of the material in water at room temperature Unlike its Me ammonium counterpart, PhVPI proved to be unaffected by water exposure. The lack of reactivity towards water is to be attributed to the quaternary nature of the nitrogen atoms of the Ph viologen units that prevents the formation of acid-base equilibrium when in contact with water. However, PhVPI’s thermal stability was evaluated by temperature-controlled powder XRD measurements following an hour-long isothermal treatment at 250 and 300°. In both cases no signs of decomposition could be detected. However, the compound melted incongruently at 332° producing, upon cooling, a mostly amorphous material. PhVPI is slightly soluble in DMF (âˆ? mM) and highly soluble in DMSO. Nevertheless, its solubility in DMF can be dramatically increased by adding an equimolar amount of DMSO. Therefore, Ph viologen lead iodide can be amenable for the fabrication of solar devices by spin coating as actually done for MAPI-based cells. The crystal structure, determined by single crystal x-ray diffraction using synchrotron radiation, turned out to be triclinic and consequently differs from the prototypal perovskite structure. In fact, it comprises infinite double chains of corner-sharing PbI₆ octahedra along the a-axis direction with Ph viologen cations positioned between the columns. Finally, the present determination of PhVPI’s electronic band structure achieved through UPS and UV-visible DRS is instrumental in using the material for solar cells.

Dalton Transactions published new progress about 47369-00-6. 47369-00-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Salt,Benzene,Organic ligands for MOF materials,Nitrogen containing MOF ligands,Nitrogen containing MOF ligands, name is 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, and the molecular formula is C22H18Cl2N2, Safety of 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem