Tag: M.W=350-400

Li, Zhehui published the artcileAperture-Opening Encapsulation of a Transition Metal Catalyst in a Metal-Organic Framework for CO₂ Hydrogenation, HPLC of Formula: 338800-13-8, the publication is Journal of the American Chemical Society (2018), 140(26), 8082-8085, database is CAplus and MEDLINE.

The aperture-opening process resulting from dissociative linker exchange in zirconium-based metal-organic framework (MOF) UiO-66 was used to encapsulate the ruthenium complex (^tBuPNP)Ru(CO)HCl in the framework (^tBuPNP = 2,6-bis((di-tert-butyl-phosphino)methyl)pyridine). The resulting encapsulated complex, [Ru]@UiO-66, was a very active catalyst for the hydrogenation of CO₂ to formate. Unlike the analogous homogeneous catalyst, [Ru]@UiO-66 could be recycled five times, showed no evidence for bimol. catalyst decomposition, and was less prone to catalyst poisoning. These results demonstrated for the first time how the aperture-opening process in MOFs can be used to synthesize host-guest materials useful for chem. catalysis.

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, HPLC of Formula: 338800-13-8.

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

Li, Jialing published the artcileReversible Switching of Molecular Conductance in Viologens is Controlled by the Electrochemical Environment, Application of 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, the publication is Journal of Physical Chemistry C (2021), 125(40), 21862-21872, database is CAplus.

Charge transport in electrochem. energy-storage systems critically relies on supporting electrolytes to maintain ionic strength and solution conductivity Despite recent progress, it is not fully understood how the solvation environment affects mol. charge transport of redox-active species near electrode interfaces. The authors characterize the charge-transport properties of bipyridinium mols. in different supporting electrolyte and counterion environments using a combination of experiments and computational modeling. The authors’ results show that mol. charge transport in viologens critically depends on the chem. identity of counterions and the solvation environment. Using an electrochem. scanning tunneling microscope-break junction (ECSTM-BJ) instrument, the authors observe a large and reversible 10-fold enhancement in mol. conductance upon electrochem. reduction of the viologen redox pair (V^2+/+) to the radical cationic state in the electrolytic solution D. functional theory (DFT) simulations show that charge transport is enhanced due to mol. conformational changes and planarization resulting from interactions with different counterions, which ultimately leads to enhanced charge transport in the reduced state. Overall, this work highlights the role of the counterion species on electrochem. charge transport in redox-active mols. that underpin the design of new energy-storage systems or programmable mol. electronic devices.

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, Application of 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride.

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

Gair, Joseph J. published the artcileSynthesis, Characterization, and Theoretical Investigation of a Transition State Analogue for Proton Transfer during C-H Activation by a Rhodium-Pincer Complex, COA of Formula: C23H43NP2, the publication is Organometallics (2019), 38(7), 1407-1412, database is CAplus.

A heterobimetallic Rh-pincer complex bearing a phenylzinc ligand was synthesized and characterized by multinuclear NMR, COSY, NOESY, and x-ray crystallog. The crystal structure of this complex shows that it possesses a bridging Rh-Zn-C fragment with a geometry similar to the Rh-H-C fragment in a proposed transition state for metal to ligand proton transfer during redox-neutral C-H activation with dearomatized Rh pincer complexes. Bonding anal. indicates that these fragments are isolobal, suggesting that the transition state analog models not only the structure but also the bonding interactions that underlie metal-ligand cooperativity in the C-H activation transition state. The similarity of the transition state and its analog prompted reevaluation of the relevant rate equations to determine the relative contributions of viable proton transfer pathways. Parallel anal. of the transition state and its isolobal analog thus serves as a bridge between theory and experiment that is rarely available in studies of bonding in transition states.

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, COA of Formula: C23H43NP2.

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

Lease, Nicholas published the artcilePNP-Pincer Complexes of Osmium: Comparison with Isoelectronic (PCP)Ir and (PNP)Ir⁺ Units, SDS of cas: 338800-13-8, the publication is Organometallics (2018), 37(3), 314-326, database is CAplus.

Several complexes of (^tBu4PNP)Os (1, ^tBu4PNP = C₅NH₃-2,6-(CH₂P^tBu₂)₂) are reported. 1 Is isoelectronic with (^tBu4PCP)Ir (2, (^tBu4PCP)Ir = κ³-C₆H₃-2,6-(CH₂P^tBu₂)₂) which has played a leading role in homogeneous catalytic alkane dehydrogenation; the (^tBu4PNP)Os complexes were studied in this context. (^tBu4PNP)OsH₄ (1-H4) is analogous to (^tBu4PCP)IrH₄ (2-H4), but while 2-H4 has some character of a dihydrogen dihydride, 1-H4 is unambiguously a tetrahydride. Ethylene reacts with 1-H4 to afford trans-(^tBu4PNP)OsH₂(C₂H₄) (1-H₂(C₂H₄)). At 25°, 1-H₂(C₂H₄) readily undergoes reversible ethylene insertion into an Os-H bond to yield (^tBu4PNP)OsH(C₂H₅) (1-EtH). DFT calculations indicate that alkane C-H addition to 1 is thermodynamically much more favorable than addition to 2. The favorable thermodn. of 1-(alkyl)H, however, disfavor reductive elimination and formation of the free Os(0) fragment that is required for a catalytic cycle analogous to that reported for 2. C-H or H-H addition to 1 is much more favorable than to 2; this would typically be attributed to the lower oxidation state of 1. However, H₂ addition to the isoelectronic [(^tBu4PNP)Ir(I)]⁺ cation is even more favorable than addition to 1; thus the thermodn. differences result from the difference of the pincer ligand (PNP vs. PCP) rather than the different metal centers (Os(0) vs. Ir(I)). Although H₂ addition to Ir(I) is as favorable as addition to Os(0), addition of a 2nd mol. of H₂ (to give tetrahydrides) is much more favorable for (^tBu4PNP)Os. NBO anal. indicates that the MH₂/MH₄ additions are oxidative whereas the M/MH₂ transformations are reductive.

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, SDS of cas: 338800-13-8.

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

van der Vlugt, Jarl Ivar published the artcileDinuclear Copper(I) Thiolate Complexes with a Bridging Noninnocent PNP Ligand, Application of 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, the publication is Chemistry – A European Journal (2011), 17(14), 3850-3854, database is CAplus and MEDLINE.

The synthesis and crystal structures of dinuclear copper(I) complexes [Cu₂(μ-SR)(μ-PNP)Br] [R = Ph (4), CH₂Ph (5); PNP = 2,6-bis(di-tert-butylphosphinomethyl)pyridine] in which both the thiolate and PNP act as bridging ligands are described. The PNP ligand bridges in an unprecedented κ²-P,N-κ¹-P mode. The Cu…Cu distance of 2.7 Å, DFT calculations for optimized mol. structure, topol. anal. of electron d. in the framework of quantum theory of atoms in mols. (QT AIM) and natural-bond-order (NBO) anal. all indicate the absence of metallophilic interactions. These dinuclear complexes were prepared by treating a coordination polymer [Cu₂(μ-PNP)(μ-Br)₂]_n (3Br) with NaN(TMS)₂ followed by the thiol (HSR). The synthesis of the precursor 3Br from PNP and [CuBr(SMe₂)] is also described. The crystal structure of the related μ-chloro complex (3Cl) was determined since the μ-bromo complex formed poor quality crystals. Preliminary reactivity studies showed that the bromide ligand in complex 5 can be substituted with NCS or SPh.

Chemistry – A European Journal 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 C15H14Cl2S2, Application of 2,6-Bis((di-tert-butylphosphino)methyl)pyridine.

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

van der Vlugt, Jarl Ivar published the artcileCu^I Complexes with a Non-innocent PNP Ligand: Selective Dearomatization and Electrophilic Addition Reactivity, Recommanded Product: 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, the publication is Inorganic Chemistry (2009), 48(16), 7513-7515, database is CAplus and MEDLINE.

The neutral, T-shaped complex Cu^I(PN^–P^tBu) (2)featuring a de-aromatized 2,6-bis[(di-tert-butylphosphino)methyl]pyridine (PN^–P^tBu) PNP-pincer ligand, is shown to interact rapidly with electrophiles. Furthermore, C-C bond formation onto the deprotonated methylene-bridgehead carbon is observed with MeOTf as the electrophile. The mol. structure of the methylated derivatives were determined by X-ray crystallog. This represents the first case of selective modification of the lutidine-based backbone of such non-innocent PNP ligands. Theor. calculations support the formation of monomeric complex 2 and indicate the high reactivity of the methylene fragment in this Cu^I complex.

Inorganic Chemistry 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 C10H11NO4, Recommanded Product: 2,6-Bis((di-tert-butylphosphino)methyl)pyridine.

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

van der Vlugt, Jarl Ivar published the artcileT-Shaped Cationic Cu^I Complexes with Hemilabile PNP-Type Ligands, Quality Control of 338800-13-8, the publication is Inorganic Chemistry (2008), 47(11), 4442-4444, database is CAplus and MEDLINE.

The versatile coordination behavior of the PNP ligands 1A (2,6-bis[(di-tert-butylphosphino)methyl]pyridine) and 1B (2,6-bis[(diphenylphosphino)methyl]pyridine) to Cu^I is described. A hemilabile interaction of the pyridine N-donor atom to the Cu center resulted in a rare T-shaped complex with 1A, while with 1B also a tetracoordinated species could be isolated. Theor. calculations support the weak interaction of the pyridine N donor in 1A with the Cu center.

Inorganic Chemistry 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 C4Br2N2O4S, Quality Control of 338800-13-8.

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

Gibson, Dorothy H. published the artcileSynthesis and Characterization of Ruthenium(II) Hydrido and Hydroxo Complexes Bearing the 2,6-Bis(di-tert-butylphosphinomethyl)pyridine Ligand, Related Products of pyridine-derivatives, the publication is Organometallics (2004), 23(10), 2510-2513, database is CAplus.

The reaction of [Ru(CO)₂Cl₂]_n with 2,6-bis(di-tert-butylphosphinomethyl)pyridine (PNP) and then anion exchange yields [Ru(PNP)(CO)₂Cl]PF₆ (1). Reaction of 1 with AgBF₄, in acetone, followed by MeCN and then anion exchange gave [Ru(PNP)(CO)₂(MeCN)](PF₆)₂ (2); reaction of 2 with H₂O gave [Ru(PNP)(CO)₂OH]PF₆ (3), whereas reaction of 2 with aqueous KOH led to [Ru(PNP)(CO)(MeCN)H]PF₆ (4). Complexes 3 and 4 were characterized by x-ray crystal structure anal.

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, Related Products of pyridine-derivatives.

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

Wu, Guanglu published the artcileMining 2:2 Complexes from 1:1 Stoichiometry: Formation of Cucurbit[8]uril-Diarylviologen Quaternary Complexes Favored by Electron-Donating Substituents, Recommanded Product: 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, the publication is Journal of the American Chemical Society (2017), 139(8), 3202-3208, database is CAplus and MEDLINE.

A 1:1 binding stoichiometry of a host-guest complex need not consist of a single host and guest. Diarylviologens containing electron-donating substituents complexed with cucurbit[8]uril (CB[8]) in a 1:1 stoichiometry exhibit abnormally large binding enthalpies compared to typical enthalpy changes observed for 1:1 binary complexes. Here, several CB[8]-mediated host-guest complexes, which were previously reported as 1:1 binary complexes, are verified to be 2:2 quaternary complexes by a combination of isothermal titration calorimetry, ¹H, NOESY, and ROESY NMR, and ion mobility mass spectrometry, clearly indicating a binding motif of two partially overlapping diarylviologens held in place with two CB[8] mols. Formation of 2:2 quaternary complexes is favored by electron-donating substituents, while electron-withdrawing substituents typically result in 1:1 binary complexes. The stacking of two highly conjugated diarylviologens in one quaternary motif affords the complexes enhanced conductance when considered as a single-mol. conductor. Moreover, an addnl. conducting signal previously observed for this “supramol.” conductor can be readily understood with our 2:2 complexation model, corresponding to a parallel conductance pathway. Therefore, a 2:2 quaternary complex model grants a greater understanding of such supramol. complexes, enabling the design of engineered, hierarchical structures and functional materials.

Journal of the American Chemical Society 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 C24H12, Recommanded Product: 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride.

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

Benyettou, Farah published the artcileViologen-Templated Arrays of Cucurbit[7]uril-Modified Iron-Oxide Nanoparticles, Application In Synthesis of 47369-00-6, the publication is Chemistry – A European Journal (2015), 21(12), 4607-4613, database is CAplus and MEDLINE.

Magnetic and fluorescent assemblies of iron-oxide nanoparticles (NPs) were constructed by threading a viologen-based ditopic ligand, DPV²⁺, into the cavity of cucurbituril (CB[7]) macrocycles adsorbed on the surface of the NPs. Evidence for the formation of 1:2 inclusion complexes that involve DPV²⁺ and two CB[7] macrocycles was first obtained in solution by ¹H NMR and emission spectroscopy. DPV²⁺ was found to induce self-assembly of nanoparticle arrays (DPV²⁺⊂CB[7]NPs) by bridging CB[7] mols. on different NPs. The resulting viologen-crosslinked iron-oxide nanoparticles exhibited increased saturation magnetization and emission properties. This facile supramol. approach to NP self-assembly provides a platform for the synthesis of smart and innovative materials that can achieve a high degree of functionality and complexity and that are needed for a wide range of applications.

Chemistry – A European Journal 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, Application In Synthesis of 47369-00-6.

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