scholarly journals Lewis base character of the phosphorus atom in phosphanido-niobocene complexes. Synthesis of new early–early homo- and heterobimetallic entities

2011 ◽  
Vol 40 (11) ◽  
pp. 2622 ◽  
Author(s):  
R. Reguillo-Carmona ◽  
A. Antiñolo ◽  
S. García-Yuste ◽  
I. López-Solera ◽  
A. Otero
Keyword(s):  
Phosphorus Atom ◽  
Lewis Base ◽  
Early Homo

The potential of pnicogen bonding for catalysis – a computational study

2017 ◽  
Vol 15 (38) ◽  
pp. 8037-8045 ◽  
Author(s):  
J. Schmauck ◽  
M. Breugst
Keyword(s):  
Phosphorus Atom ◽  
Computational Study ◽  
Noncovalent Interaction ◽  
Lewis Base ◽  
Catalytic Reactions

Computational investigations reveal that pnicogen bonding, a noncovalent interaction between the electrophilic region of a phosphorus atom and a Lewis base, can activate electrophiles in catalytic reactions.

Lewis-Base Adducts of Group 11 Metal(I) Compounds. LXI. The 1 : 1 Adducts of the Copper(I) Halides (Cl, Br, I) With Bis(2-diphenylphosphinoethyl)phenylphosphine, 'triphos'

1991 ◽  
Vol 44 (7) ◽  
pp. 919 ◽  
Author(s):  
RD Hart ◽  
BW Skelton ◽  
AH White
Keyword(s):  
Single Crystal ◽  
Structure Determination ◽  
Copper Atom ◽  
Phosphorus Atom ◽  
Lewis Base ◽  
The Other ◽  
Asymmetric Unit ◽  
X Ray

The 1 : 1 adducts between the copper(I) halides, CuX , X = Cl , Br, I, and the title ligand, 'triphos', Ph2P(CH2)2P(Ph)(CH2)2PPh2, have been synthesized and characterized by single-crystal X-ray structure determination. The three complexes are isomorphous : monoclinic P21/c, a ≈ 14.5, b ≈ 20.5, c ≈ 24.5 Ǻ, β ≈ 118.5°; the asymmetric unit of each structure is the binuclear [Cu2X2( triphos )2] unit (with one acetonitrile solvate). Residuals were 0.047, 0.049 and 0.065 for 6006, 4832 and 5108 'observed', independent reflections respectively. About each copper atom, the four-coordinate environment comprises a terminal halogen [Cu- Cl,Br,I , 2.305(3), 2.311(2); 2.441(2), 2.443(2); 2.614(2), 2.614(2)Ǻ], two phosphorus atoms (central and distal) from the same ligand , and one distal phosphorus atom from the other ligand.

Six-Membered Hetarenes with One Nitrogen or Phosphorus Atom

2005 ◽  
Author(s):  
D. StC. Black ◽  
D. Spitzner ◽  
P. A. Keller ◽  
R. D. Larsen ◽  
D. Cai ◽  
...  
Keyword(s):  
Phosphorus Atom

Potential Electron Scattering by Phosphorus Atom

2014 ◽  
Vol 59 (6) ◽  
pp. 569-580 ◽  
Author(s):  
V.I. Kelemen ◽  
◽  
M.M. Dovhanych ◽  
E.Yu. Remeta ◽  
◽  
...  
Keyword(s):  
Electron Scattering ◽  
Phosphorus Atom

Can the Lewis basicity of an isolated solvent molecule be used for characterizing solvent effects?

2020 ◽  
Vol 16 ◽  
Author(s):  
Jean-François Gal ◽  
Pierre-Charles Maria
Keyword(s):  
Solvent Effects ◽  
Molecular Level ◽  
Solvent Molecule ◽  
Lewis Base ◽  
Bulk Liquid ◽  
Donor Number ◽  
Special Focus ◽  
Solution Processes ◽  
Inert Solvent

Background: The ubiquitous Lewis acid/base interactions are important in solution processes. Analytical chemistry may benefit of a better understanding of the role of Lewis basicity, at the molecular level or acting through a bulk solvent effect. Objective: To clearly delineate (i) the basicity at a molecular level, hereafter referred as solute basicity, and (ii) the solvent basicity, which is a bulk-liquid property. Method: The literature that relates Lewis basicity scales and solvent effects is analyzed. A special focus is placed on two extensive scales, the Donor Number, DN, and the BF3 affinity scale, BF3A, which were obtained by calorimetric measurement on molecules as solutes diluted in a quasi-inert solvent, and therefore define a molecular Lewis basicity. We discuss the validity of these solute scales when regarded as solvent scales, in particular when the basicity of strongly associated liquids is discussed. Results: We demonstrate the drawbacks of confusing the Lewis basicity of a solvent molecule, isolated as solute, and that of the bulk liquid solvent itself. Conclusion: Consequently, we recommend a reasoned use of the concept of Lewis basicity taking clearly into account the specificity of the process for which a Lewis basicity effect may be invoked. In particular, the action of the Lewis base, either as an isolated entity, or as a bulk liquid, must be distinguished.

Metal-organic Nanopharmaceuticals

2020 ◽  
Vol 8 (3) ◽  
pp. 163-190
Author(s):  
Benjamin Steinborn ◽  
Ulrich Lächelt
Keyword(s):  
Metal Ions ◽  
Coordination Polymers ◽  
Active Agent ◽  
Lewis Base ◽  
High Loading ◽  
Active Components ◽  
Base Functions ◽  
Metal Organic ◽  
Theranostic Applications ◽  
Pharmacologically Active

: Coordinative interactions between multivalent metal ions and drug derivatives with Lewis base functions give rise to nanoscale coordination polymers (NCPs) as delivery systems. As the pharmacologically active agent constitutes a main building block of the nanomaterial, the resulting drug loadings are typically very high. By additionally selecting metal ions with favorable pharmacological or physicochemical properties, the obtained NCPs are predominantly composed of active components which serve individual purposes, such as pharmacotherapy, photosensitization, multimodal imaging, chemodynamic therapy or radiosensitization. By this approach, the assembly of drug molecules into NCPs modulates pharmacokinetics, combines pharmacological drug action with specific characteristics of metal components and provides a strategy to generate tailorable multifunctional nanoparticles. This article reviews different applications and recent examples of such highly functional nanopharmaceuticals with a high ‘material economy’. : Lay Summary: Nanoparticles, that are small enough to circulate in the bloodstream and can carry cargo molecules, such as drugs, imaging or contrast agents, are attractive materials for pharmaceutical applications. A high loading capacity is a generally aspired parameter of nanopharmaceuticals to minimize patient exposure to unnecessary nanomaterial. Pharmaceutical agents containing Lewis base functions in their molecular structure can directly be assembled into metal-organic nanopharmaceuticals by coordinative interaction with metal ions. Such coordination polymers generally feature extraordinarily high loading capacities and the flexibility to encapsulate different agents for a simultaneous delivery in combination therapy or ‘theranostic’ applications.

Catalytic activity of rhodium(I) complexes containing (ω-trimethylsilylalkyl)diphenylphosphines

1980 ◽  
Vol 45 (8) ◽  
pp. 2219-2223 ◽  
Author(s):  
Marie Jakoubková ◽  
Martin Čapka
Keyword(s):  
Catalytic Activity ◽  
Nmr Spectroscopy ◽  
Ir Spectroscopy ◽  
Electron Density ◽  
Phosphorus Atom ◽  
Proton Acceptor ◽  
Trimethylsilyl Group ◽  
Kinetics Of

Kinetics of homogenous hydrogenation of 1-heptene catalysed by rhodium(I) complexes prepared in situ from μ,μ'-dichloro-bis(cyclooctenerhodium) and phosphines of the type RP(C6H5)2 (R = -CH3, -(CH2)nSi(CH3)3; n = 1-4) have been studied. The substitution of the ligands by the trimethylsilyl group was found to increase significantly the catalytic activity of the complexes. The results are discussed in relation to the electron density on the phosphorus atom determined by 31P NMR spectroscopy and to its proton acceptor ability determined by IR spectroscopy.

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