Tag: M.W=350-400

Kao, Sheng-Yuan published the artcileAchieving a large contrast, low driving voltage, and high stability electrochromic device with a viologen chromophore, Name: 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, the publication is Journal of Materials Chemistry C: Materials for Optical and Electronic Devices (2015), 3(14), 3266-3272, database is CAplus.

The viologen radical salt (VRS), consisting of Ph viologen (PV) dications and 2,2,6,6-tetramethyl-1-piperidinyloxy derivative (TEMPOD) anions, was successfully synthesized. The VRS was combined with N,N,N’,N’-tetramethyl-p-phenylenediamine (TMPD) to form an electrochromic device (ECD). This ECD offers significant transmittance changes (>60% at both 580 and 620 nm), but only requires 0.4 V for switching, the lowest driving voltage ever reported. Such a low driving voltage further strengthens the energy-saving capability of the ECD. The incorporation of TEMPOD in the ECD greatly improved its write-erase ability while insufficient bleaching was clearly observed within only 5 cycles in the case of its counterpart without adding TEMPOD anions. No significant decay in the transmittance change was noticed in the proposed ECD after subjecting to 100 cycles. Even better cycling stability would be expected if counter anions with multiple TEMPO units were utilized.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices 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 artcileTwo Sharp Phase Change Processes of Diphenyl Viologen at a Au(111) Electrode Surface: Non-Faradaic Transition with Interplay of Ionic Adsorption of Chloride and Bromide and Faradaic One, Synthetic Route of 47369-00-6, the publication is Journal of Physical Chemistry C (2015), 119(3), 1320-1329, database is CAplus.

Two phase change processes of di-Ph viologen (dPhV) on a Au(111) electrode in KCl and KBr aqueous solutions were described using the results of voltammetric, electroreflectance (ER), and electrochem. scanning tunneling microscopic (EC-STM) measurements. Both processes exhibited sharp spikelike voltammetric responses. In KCl solution, the phase change at 0.30 V vs. Ag/AgCl/saturated KCl is a nonfaradaic order-disorder phase transition, from an ordered adlayer of dPhV dication (dPhV²⁺) with coadsorbed Cl^– at more pos. potentials than 0.30 V to a gas-like phase at less pos. potentials. The faradaic reaction at -0.09 V is the transition from the gaslike phase to a condensed monolayer of dPhV^â€?. The EC-STM images of the condensed monolayer showed stripe patterns of rows of π-π stacked dPhV^â€?. Almost the same set of two processes was observed in KBr solution but not in KF solution In KF solution, although two voltammetric responses were observed, the peaks were small and broad, indicative of sluggish adsorption state changes of individual dPhV cations. Taken together, specific adsorption of coexistent anions is of critical importance for the occurrence of the sharp nonfaradaic phase transition.

Journal of Physical Chemistry C 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

Pham, Duc T. published the artcileAnion/cation layers at electrified interfaces: a comprehensive STM, XRD and XPS case study, Quality Control of 47369-00-6, the publication is Chimia (2009), 63(3), 115-121, database is CAplus.

Charged organic adsorbates play an important role in a number of electrochem. reactions, e.g. as additives for metal plating relevant for device fabrication in the semiconductor industry. Fundamental investigations are mandatory in order to acquire profound knowledge of the structural and electronic properties of these layers parallel and perpendicular to the surface, and to finally achieve a deeper mechanistic understanding of the kinetics of involved charge transfer reactions taking place at these complex metal/organic/electrolyte interfaces. A key structural motif of these interfaces consists in ‘paired’ (inorganic)anion/(organic)cation layers that can have an enormous stability even during an ongoing charge transfer reaction. In this contribution we present and discuss a selected case study on the co-adsorption of halide anions and cationic organic mols. that exhibit a pronounced redox activity. It will be demonstrated that their phase behavior at the interface crucially depends on both their particular redox-state and the surface concentration of the halide counter ions. The subtle balance between adsorbate-adsorbate and adsorbate-substrate interaction of the poly-cationic organic layer can be carefully controlled by potential dependent anion adsorption and desorption processes through the organic layer. This process can be followed by in situ high-resolution scanning tunnelling microscopy, while addnl. information about the structural and chem. state of the resp. phase is obtained from in situ X-ray diffraction and ex situ photoelectron spectroscopy.

Chimia 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, Quality Control of 47369-00-6.

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

Imai, Yoshitane published the artcileCharge-transfer host system composed of 9,10-bis(3,5-dihydroxyphenyl)anthracene and methylviologen, Product Details of C22H18Cl2N2, the publication is Tetrahedron (2009), 65(18), 3740-3744, database is CAplus.

By using 9,10-bis(3,5-dihydroxyphenyl)anthracene as an electron donor and 1,1′-dimethyl-4,4′-bipyridinium dichloride as an electron acceptor, a spontaneously resolved charge-transfer (CT) complex is formed. This CT complex can include n-alkyl alc. mols. as guests, and the DRS of this CT complex change with the type of component guest mols.

Tetrahedron 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, Product Details of C22H18Cl2N2.

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

Imai, Yoshitane published the artcileFormation of chiral charge-transfer complex with axially chiral 1,1′-bi-2-naphthol and viologen derivatives, Computed Properties of 47369-00-6, the publication is Tetrahedron Letters (2006), 47(21), 3603-3606, database is CAplus.

By using three types of viologen derivatives, we synthesized chiral charge-transfer (CT) complexes with an axially chiral 1,1′-bi-2-naphthol mol. and successfully controlled the crystal structure and inclusion ability of the third component by changing the viologens.

Tetrahedron Letters 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, Computed Properties of 47369-00-6.

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

Smoll, Karena A. published the artcilePhotolysis of Pincer-Ligated Pd^II-Me Complexes in the Presence of Molecular Oxygen, Application In Synthesis of 338800-13-8, the publication is Organometallics (2017), 36(7), 1213-1216, database is CAplus.

The reactions of ^t-BuPNP and ^t-BuPCP Pd^II-Me complexes (^t-BuPNP = 2,6-bis[(di-tert-butylphosphino)methyl]pyridine and ^t-BuPCP = 2,6-bis[(di-tert-butylphosphino)methyl]phenyl) with O₂ are described and compared with the reported O₂ reactivity of related Pd^II-Me complexes. [(^t-BuPNP)PdMe]Cl was found to react with O₂ upon photolysis resulting in oxidation of the pincer ligand backbone to produce a (^t-BuPNO)PdCl complex. In contrast, photolysis of (^t-BuPCP)PdMe with O₂ resulted in oxidation of the Pd-Me group to form (^t-BuPCP)PdOCO₂H. Isotopic labeling, radical initiators, and solvent studies were used to gain insight into the mechanisms of these unusual reactions of late metal alkyls with mol. oxygen.

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 C7H7ClN2S, Application In Synthesis of 338800-13-8.

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

Nielsen, Martin published the artcileEfficient Hydrogen Production from Alcohols under Mild Reaction Conditions, Synthetic Route of 338800-13-8, the publication is Angewandte Chemie, International Edition (2011), 50(41), 9593-9597, database is CAplus and MEDLINE.

This effective acceptor-less dehydrogenation of alc. employs mild, neutral reaction conditions. The protocol is extended beyond the typical model substrate, iso-Pr alc., to the bio-relevant ethanol. Unprecedented high turnover frequencies for both iso-Pr alc. and ethanol are observed at low temperatures (< 100〈°C).

Angewandte Chemie, International Edition 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, Synthetic Route of 338800-13-8.

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

Rauch, Michael published the artcileMetal-Ligand Cooperation Facilitates Bond Activation and Catalytic Hydrogenation with Zinc Pincer Complexes, COA of Formula: C23H43NP2, the publication is Journal of the American Chemical Society (2020), 142(34), 14513-14521, database is CAplus and MEDLINE.

A series of PNP zinc pincer complexes capable of bond activation via aromatization/dearomatization metal-ligand cooperation (MLC) were prepared and characterized. Reversible heterolytic N-H and H-H bond activation by MLC is shown, in which hemilability of the phosphorus linkers plays a key role. Utilizing this zinc pincer system, base-free catalytic hydrogenation of imines and ketones is demonstrated. A detailed mechanistic study supported by computation implicates the key role of MLC in facilitating effective catalysis. This approach offers a new strategy for (de)hydrogenation and other catalytic transformations mediated by zinc and other main group metals. Safety: caution advised with pyrophoric organozinc compounds, gas evolution at high temperature and reactions involving H₂.

Journal of the American Chemical Society 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, COA of Formula: C23H43NP2.

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

Simler, Thomas published the artcilePotassium and Lithium Complexes with Monodeprotonated, Dearomatized PNP and PNC^NHC Pincer-Type Ligands, Product Details of C23H43NP2, the publication is Organometallics (2016), 35(6), 903-912, database is CAplus.

The reaction of 2,6-bis(di-tert-butylphosphinomethyl)pyridine (^tBuPN^tBuP) with 1 molar equiv of KCH₂C₆H₅ or LiCH₂SiMe₃ gave M(^tBuP^*N_a^tBuP) (M = K, Li; P^* = vinylic P donor, ^tBuP = P^tBu₂, N_a = anionic amido N donor) after monodeprotonation of the α-lutidinyl-CH₂ and concomitant dearomatization of the heterocycle. Evidence is provided that the anion ^tBuP^*N_a^tBuP may exist as Z- and E-isomers, interconvertible by rotation about the C_α-N-C_α-P exocyclic formal double bond. Thus, the two isomers of K(^tBuP^*N_a^tBuP), i.e., [K{(Z)-(^tBuP^*N_a^tBuP-κP^*,κN_a,κP)}(THF)], 1-Z·(THF), and [K{(E)-(^tBuP^*N_a^tBuP-κN_a,κP)}(THF)], 1-E·(THF), cocrystd. from THF in a 4:1 ratio. However, in the presence of DME, the isomerically pure [K{(E)-(^tBuP^*N_a^tBuP-κN_a,κP)}(DME)₂], 1-E·2(DME), was crystallized The α-picolinyl-CH₂ moiety in ^RPNC^NHC (N = substituted 2-picoline, ^RP = PCy₂, R = Cy; ^RP = P^tBu₂, R = ^tBu; C^NHC = N-heterocyclic carbene) was similarly deprotonated with concomitant dearomatization using LiN(SiMe₃)₂. This afforded the complexes Li(^RP^*N_aC^NHC), which were crystallized as the Z- or E-isomers, [Li{(E)-(^tBuP^*N_aC^NHC-κN_a,κC^NHC)}(Et₂O)₂], 3^tBu-E·2(Et₂O), [Li{(Z)-(^CyP^*N_aC^NHC-κP^*,κN_a,κC^NHC)}(Et₂O)], 3^Cy-Z·(Et₂O), and [Li{(Z)-(^tBuP^*N_aC^NHC-κP^*,κN_a,κC^NHC)}(Et₂O)], 3^tBu-Z·(Et₂O). The Z- and E-isomers reversibly interconvert in solution as shown by ³¹P{¹H} and ⁷Li NMR spectroscopy. The acidity of the α-picolinyl-CH₂ in ^RPNC^NHC is higher than in the known ^tBuPN^tBuP (ca. by 6 pK_a units).

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 C3H9ClOS, Product Details of C23H43NP2.

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

Hu, Gongfang published the artcileSurprisingly big linker-dependence of activity and selectivity in CO₂ reduction by an iridium(I) pincer complex, Formula: C23H43NP2, the publication is Chemical Communications (Cambridge, United Kingdom) (2020), 56(64), 9126-9129, database is CAplus and MEDLINE.

Here, we report the quant. electroreduction of CO₂ to CO by a PNP-pincer iridium(I) complex bearing amino linkers in DMF/water. The electrocatalytic properties greatly depend on the choice of linker within the ligand. The complex 3-N is far superior to the analogs with methylene and oxygen linkers, showing higher activity and better selectivity for CO₂ over proton reduction

Chemical Communications (Cambridge, United Kingdom) 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, Formula: C23H43NP2.

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