An examination of the effects of borate group proximity on phosphine donor power in anionic (phosphino)tetraphenylborate ligands

2015 ◽  
Vol 776 ◽  
pp. 153-156 ◽  
Author(s):  
Joseph P. Tassone ◽  
Robert C. Mawhinney ◽  
Gregory J. Spivak
Keyword(s):  
Donor Power

121Sb Mössbauer Spectra of Hypervalent Complexes Having an Antimony-transition Metal Bond and Partial Quadrupole Coupling Constants

2002 ◽  
Vol 57 (6-7) ◽  
pp. 631-639 ◽  
Author(s):  
Masashi Takahashi ◽  
Atsushi Ishiguro ◽  
Masaki Maeda ◽  
Masuo Takeda ◽  
Koichiro Toyota ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Transition Metal ◽  
Mössbauer Spectra ◽  
Coupling Constants ◽  
Metal Bond ◽  
Mossbauer Spectra ◽  
Electronic Feature ◽  
Quadrupole Coupling ◽  
Related Compounds ◽  
Donor Power

Antimony-121 Mössbauer spectra for hypervalent pentacoordinate antimony compounds having Sb-transition metal bond [Rf2SbMCp(CO)n {RfH = o-C6H4C(CF3)2OH- , M = Fe, Ru, Cr,Mo, W}, Rf2SbFeCp(CO)PPh3, Rf2SbFeCp(dppe)] and closely related compounds Rf2SbTol (Tol = p-CH3C6H4), Rf2SbX (X = Cl, Br) are described. The strong -donor power of the metal fragments is demonstrated by theM¨ossbauer parameters. The -donor power decreases in the order FeCp(dppe) > FeCp(CO)PPh3 > FeCp(CO)2 > RuCp(CO)2 > CrCp(CO)3 > MoCp(CO)3 > WCp(CO)3 ≫Tol. The essential trends in the molecular structure and the Berry pseudorotation are interpreted by this order. In addition, the e2qQ values for 32 hypervalent antimony compounds are successfully calculated using the additivity model for the e2qQ value. A unique electronic feature for Rf2SbX is clarified through the calculation

scholarly journals Donor Power and the News

2017 ◽  
Vol 22 (2) ◽  
pp. 163-184 ◽  
Author(s):  
Martin Scott ◽  
Mel Bunce ◽  
Kate Wright
Keyword(s):  
Donor Power

1,2-Diaryl-1,2-disodioethanes: Versatile, Highly Reactive, and Tunable Synthetic Equivalents of Sodium Metal

2017 ◽  
Vol 70 (6) ◽  
pp. 647 ◽  
Author(s):  
Ugo Azzena
Keyword(s):  
Electron Transfer ◽  
Aromatic Ring ◽  
Organic Pollutants ◽  
Electron Donor ◽  
Persistent Organic Pollutants ◽  
Single Electron Transfer ◽  
Halogen Bonds ◽  
Sodium Metal ◽  
Arylacetic Acids ◽  
Donor Power

1,2-Diaryl-1,2-disodioethanes are easily prepared, versatile, and stable diorganometals finding application in 1,2-reductive eliminations as well as in the degradation of several persistent organic pollutants as homogeneous synthetic equivalents of a highly reactive form of Na metal. Understanding their reactivity in terms of their different electron-donor power, which is strongly affected by the nature of substituents located either on the aromatic ring(s) or on the carbanionic centers, allowed rationalization of their employment not only as chemoselective single electron transfer reducing reagents, but also as bases in the generation of enediolates of arylacetic acids bearing easily reducible carbon–halogen bonds.

Engaging African Men through Sexual, Reproductive Health, and Rights Interventions

2020 ◽  
Vol 79 (3) ◽  
pp. 165-175
Author(s):  
Jeroen Lorist
Keyword(s):  
Reproductive Health ◽  
Knowledge Network ◽  
Development Organization ◽  
Training Materials ◽  
Engaging Men ◽  
Organizational Ethnography ◽  
Engagement Interventions ◽  
Globally Distributed ◽  
And Training ◽  
Donor Power

This article examines how research and ideas related to so-called positive masculinities have emerged and proliferated among employees of a Dutch development organization, enabling it to establish itself as a frontrunner in engaging men in campaigns to improve sexual and reproductive health and rights (SRHR). Arguments draw on organizational ethnography conducted from September 2016 until July 2018 and analysis of discursive practices embedded in documents and training materials that have helped establish men as a new target for intervention. These ideas circulate within a Dutch-funded, globally distributed knowledge network that is for the most part invisible to the African men being targeted. At the same time, the Dutch experts developing these “men engagement” interventions are also largely unaware of how unspoken Dutch norms around gender equality, masculinity, and race are used to legitimize these interventions. This paper emphasizes the importance of considering how donor agendas and donor power work, while at the same time exploring how these elements can, often unconsciously, be inserted into programs, often skewing them in a particular direction.

Eu3+ as a dual probe for the determination of IL anion donor power: A combined luminescence spectroscopic and electrochemical approach

2014 ◽  
Vol 192 ◽  
pp. 191-198 ◽  
Author(s):  
Arash Babai ◽  
Gabriel Kopiec ◽  
Anastasia Lackmann ◽  
Bert Mallick ◽  
Slawomir Pitula ◽  
...  
Keyword(s):  
Electrochemical Approach ◽  
Dual Probe ◽  
Donor Power

A Novel Hydrogen-bonded Zigzag Chain Manganese(III) Complex: Synthesis, Crystal Structure and Magnetic Properties

2007 ◽  
Vol 62 (5) ◽  
pp. 691-695 ◽  
Author(s):  
Hulya Kara
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Axial Direction ◽  
Water Molecules ◽  
Zigzag Chain ◽  
X Ray Diffraction ◽  
X Ray ◽  
Distorted Octahedral ◽  
Coordinated Water ◽  
Donor Power

AbstractThe synthesis, crystal structure and magnetic properties of [Mn(III)L(H2O)2]+ClO4 −, 1 [L = N,N′-bis(rac-3,5-dichlorosalicylidenato)-1,2-diaminopropane] are reported. Single crystal X-ray diffraction studies showed the structure to consist of [MnL(H2O)2]+ octahedra, with trans-coordinated water molecules, which are linked into infinite helices by hydrogen bonds. The distorted octahedral manganese(III) centre contains an N2O2O′2 coordination sphere made up of the Schiff base ligand in the equatorial plane. In the axial direction, an elongation of the trans Mn-Owater bonds to 2.165(2) and 2.187(2) Å is observed. Such elongations are typical of d4 systems but in this case may also be attributed to the poorer donor power of the water molecules.

scholarly journals A Comprehensive Analysis of the Metal–Nitrile Bonding in an Organo-Diiron System

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7088
Author(s):  
Giulio Bresciani ◽  
Lorenzo Biancalana ◽  
Guido Pampaloni ◽  
Stefano Zacchini ◽  
Gianluca Ciancaleoni ◽  
...  
Keyword(s):  
Spectroscopic Data ◽  
Comprehensive Analysis ◽  
X Ray Diffraction ◽  
Bond Energies ◽  
Comprehensive Description ◽  
X Ray ◽  
Multinuclear Nmr Spectroscopy ◽  
Back Donation ◽  
Suitable System ◽  
Donor Power

Nitriles (N≡CR) are ubiquitous in coordination chemistry, yet literature studies on metal–nitrile bonding based on a multi-technique approach are rare. We selected an easily-available di-organoiron framework, containing both π-acceptor (CO, aminocarbyne) and donor (Cp = η5−C5H5) ligands, as a suitable system to provide a comprehensive description of the iron–nitrile bond. Thus, the new nitrile (2–12)CF3SO3 and the related imine/amine complexes (8–9)CF3SO3 were synthesized in 58–83% yields from the respective tris-carbonyl precursors (1a–d)CF3SO3, using the TMNO strategy (TMNO = trimethylamine-N-oxide). The products were fully characterized by elemental analysis, IR (solution and solid state) and multinuclear NMR spectroscopy. In addition, the structures of (2)CF3SO3, (3)CF3SO3, (5)CF3SO3 and (11)CF3SO3 were ascertained by single crystal X-ray diffraction. Salient spectroscopic data of the nitrile complexes are coherent with the scale of electron-donor power of the R substituents; otherwise, this scale does not match the degree of Fe → N π-back-donation and the Fe–N bond energies, which were elucidated in (2–7)CF3SO3 by DFT calculations.

Atomic Level Mechanism of the White Phosphorous Demolition by Di-iodine

2017 ◽  
Author(s):  
Carlo Mealli ◽  
Andrea Ienco ◽  
Maurizio Peruzzini ◽  
Gabriele Manca
Keyword(s):  
Electron Transfer ◽  
Halogen Bonding ◽  
Atomic Level ◽  
Detailed Mechanism ◽  
Bonding Interaction ◽  
Significant Barrier ◽  
High Donor ◽  
Donor Power

A detailed mechanism of the I2-induced transformation of white phosphorus into PI3 emerges from a DFT analysis. The multi-step process implies at any stage one P P and two I I bond cleavages, associated to the formation of two P I bonds plus an in situ generated brand new I2 molecule. Significant electron transfer between atoms is observed at any step, but the reactions better define as concerted rather than redox. Along the steepest descent to the product, no significant barrier is encountered except for the very first P4 activation, which costs +14.6 kcal mol-1. At the atomic level, one first I2 molecule, a typical mild oxidant, is first involved in a linear halogen bonding interaction (XB) with one P donor, while its terminal I atom is engaged in an additional XB adduct with a second I2. Significant electron transfer through the combined diatomics allows the external I atom of the dangling I3 grouping to convey electrons into the * level of one P P bond with its consequent cleavage. This implies at some point the appearance of a six-membered ring, which alternative switches its bonding and no-bonding interactions. The final transformation of the P2I4 diphosphine into two PI3 phosphines is enlightening also for the specific role of the I substituents. In fact, it is proved that an organo-diphosphine analogue hardly undergoes the separation of two phosphines, as reported in literature. This is attributable to the particularly high donor power of the carbo-substituted P atoms, which prevents the concertedness of the reaction but favors charge separation in an unreactive ion pair. <br>

scholarly journals On the relation between carbonyl stretching frequencies and the donor power of chelating diphosphines in nickel dicarbonyl complexes

2017 ◽  
Vol 19 (13) ◽  
pp. 9028-9038 ◽  
Author(s):  
Marco Fusè ◽  
Isabella Rimoldi ◽  
Edoardo Cesarotti ◽  
Sergio Rampino ◽  
Vincenzo Barone
Keyword(s):  
Bond Formation ◽  
Metal Ligand ◽  
Ligand Bond ◽  
Donor Power

We unravel the mechanisms of chelation-bond formation in nickel dicarbonyl complexes with bidentate phosphines and demonstrate that σ donation drives the carbonyl stretching response to the metal–ligand bond formation.

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