Make Sure Your Donor Capacity Ratings Are Current

2018 ◽  
Vol 20 (11) ◽  
pp. 5-5
Keyword(s):  
Donor Capacity

Bulky bis(aryl)triazenides: just aspiring amidinates? A structural and spectroscopic study

2020 ◽  
Vol 49 (17) ◽  
pp. 5653-5661 ◽  
Author(s):  
Matthew R. Gyton ◽  
Anthony R. Leverett ◽  
Marcus L. Cole ◽  
Alasdair I. McKay
Keyword(s):  
Coordination Chemistry ◽  
Spectroscopic Study ◽  
Main Group ◽  
Donor Capacity ◽  
Group Species

The triazenide ligand is compared to the isoelectronic formamidinate with regards donor capacity, coordination chemistry and capacity to stabilise reactive main group species.

Novel Intramolecular CAryl–S Bond Activation by an Electron Rich, Ring-Expanded-NHC-Rh centre: A Combined Experimental and DFT Study

2011 ◽  
Vol 64 (8) ◽  
pp. 1141 ◽  
Author(s):  
Abeer Binobaid ◽  
Kingsley J. Cavell ◽  
Mikhail S. Nechaev ◽  
Benson M. Kariuki
Keyword(s):  
Bond Activation ◽  
Reaction Pathway ◽  
Heterocyclic Carbenes ◽  
Dft Study ◽  
Dft Studies ◽  
X Ray ◽  
Carbene Complex ◽  
Donor Capacity ◽  
Insight Into ◽  
Sulfur Bond

The reaction of (o-MeSPh)-N-functionalized tetrahydropyrimidinium salts with KN(SiMe3)2 and [Rh(COD)Cl]2 in THF leads to the formation of a novel dimeric RhIII bis-carbene complex. The reaction involves the unexpected cleavage/oxidative addition of the aryl-sulfur bond to give dimeric metallated RhIII with bridging MeS< moieties. This unusual reaction is probably a consequence of the sterically imposing structure and strong donor capacity of ring-expanded N-heterocyclic carbenes (RE-NHCs). An X-ray structure of the [(Ph,DIPP-NHC)Rh(Cl)(SMe)2] product complex has been obtained, and DFT studies were undertaken to gain an insight into the reaction pathway.

Singularities in the physicochemical properties of spontaneous AOT-BHD unilamellar vesicles in comparison with DOPC vesicles

2015 ◽  
Vol 17 (26) ◽  
pp. 17112-17121 ◽  
Author(s):  
Cristian C. Villa ◽  
N. Mariano Correa ◽  
Juana J. Silber ◽  
Fernando Moyano ◽  
R. Darío Falcone
Keyword(s):  
Physicochemical Properties ◽  
Electron Donor ◽  
High Viscosity ◽  
Unilamellar Vesicles ◽  
Donor Capacity

AOT-BHD vesicles present a bilayer completely different to the traditional DOPC vesicles, with low polarity, high viscosity and more electron donor capacity.

Hydrogen Bonding Contribution to Lipophilicity Parameters. Hydrogen Acceptor and Hydrogen Acceptor Donor Parameters

2004 ◽  
Vol 69 (12) ◽  
pp. 2147-2173 ◽  
Author(s):  
Marvin Charton ◽  
Barbara I. Charton
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Reasonable Assumption ◽  
Hydrogen Acceptor ◽  
Donor Capacity ◽  
The Difference ◽  
Acceptor Capacity ◽  
Lipophilicity Parameters ◽  
Hydrogen Bond Energies

In our analysis of the composition of lipophilicity parameters by the intermolecular force (IMF) model we have made use of nH, the number of OH and/or NH bonds, as a measure of the hydrogen donor capacity of a substituent; and nn, the number of lone pairs on O and/or N atoms in the substituent, as a measure of the hydrogen acceptor capacity of the substituent. The basis of this method is the reasonable assumption that in 55.6 molar water hydrogen bonding is maximized. The method does not account however for differences in the energy of different types of hydrogen bonds, but further assumes that these differences are to a first approximation negligible. In order to improve the model we have defined a scale of group hydrogen bonding acceptor parameters, ηXHA, and overall hydrogen bond parameters ηXHAD from the water/1-octanol partition coefficients of AkX where Ak is alkyl. These parameters should account for both the extent of hydrogen bonding in water and for the difference in hydrogen bond energies of the various types of hydrogen bonds encountered. Correlations of log P values for Ph(CH2)nX, X1(CH2)X2, and substituted amino acids Xaa with the IMF equation using the ηXHA and ηXHAD parameters demonstrated their use. Correlation of log P values for PhX suggested that for many groups separate sets of ηXHA and ηXHAD values are required when they are bonded to sp2 hybridized carbon rather than sp3 hybridized carbon.

Synthesis and Catalytic Activity of Rhodium(I) and Iridium(I) 4,5-Dibrominated N-Heterocyclic Carbenes

2018 ◽  
Author(s):  
Samantha Furfari ◽  
Matthew Gyton ◽  
Marcus Cole
Keyword(s):  
Catalytic Activity ◽  
Spectroscopic Data ◽  
Heterocyclic Carbenes ◽  
Transfer Hydrogenation ◽  
Carbonyl Complexes ◽  
Donor Capacity ◽  
Catalytic Applications

The synthesis and characterisation of another example of an air-stable carbene is described, in addition to the preparation of rhodium and iridium olefin and carbonyl complexes. The spectroscopic data indicates that these air-stable carbenes do not display reduced sigma-donor capacity of the carbenic centre. The catalytic applications of these carbenes are explored in the hydrosilylation and transfer hydrogenation processes.

Evidence for the donor capacity of nitrogen in acyclic aminophosphines: a multinuclear NMR study

1989 ◽  
Vol 28 (17) ◽  
pp. 3341-3345 ◽  
Author(s):  
R. K. Kanjolia ◽  
D. K. Srivastava ◽  
C. L. Watkins ◽  
Larry K. Krannich
Keyword(s):  
Multinuclear Nmr ◽  
Nmr Study ◽  
Donor Capacity
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