6,338 research outputs found
Novel Ni(0)-COT Complexes, Displaying Semiaromatic Planar COT Ligands with Alternating C−C and C=C Bonds
No full textReaction of (R2PC2H4PR2)Ni(C2H4) with COT gives the mononuclear complexes (R2PC2H4PR2)Ni(η2-C8H8) (R = iPr 1a, tBu 1b). The COT ligand in 1a,b is planar with alternating C−C and C=C bonds, corresponding to a formal semiaromatic [C8H8]- ligand. Reactions of 1a with (iPr2PC2H4PiPr2)Ni(η2,η2-C6H10) and of 1b with stoichiometric amounts of {(tBu2PC2H4PtBu2)Ni}2(μ-C6H6) or lithium afford the dinuclear complexes {(iPr2PC2H4PiPr2)Ni}2{μ-η4(1,2,5,6):η4(3,4,7,8)-C8H8} (2a) and {(tBu2PC2H4PtBu2)Ni}2(μ-η2:η2-C8H8) (2b; two isomers). The COT ligand in 2a is tub-shaped and olefinic, whereas in 2b (as in 1a,b) it is planar and semiaromatic. The products are characterized by IR, solution and solid-state NMR spectroscopy, and by X-ray structure analysis
A New Spin on Cyclooctatetraene (COT) Redox Activity: Low-Spin Iron(1) Complexes That Exhibit Antiferromagnetic Coupling to a Singly Reduced eta(4)-COT Ligand
No full textabstract: Formally zerovalent (κ[superscript 3]-phosphine)Fe(η[superscript 4]-COT) complexes supported by either Triphos (PhP(CH[subscript 2]CH[subscript 2]PPh[subscript 2])[subscript 2]) or Triphos* (H[subscript 3]CC(CH[subscript 2]PPh[subscript 2])[subscript 3]) have been prepared following chelate addition to (COT)[subscript 2]Fe (COT = 1,3,5,7-cyclooctatetraene) and by reduction of the respective dibromide complexes in the presence of excess COT. The solid-state structure of each complex was determined by single-crystal X-ray diffraction, and close inspection of the metrical parameters revealed significant COT ligand reduction, independent of the coordination geometry about iron. While the neutral and dianionic forms of the redox-active COT ligand have historically received a great deal of attention, a dearth of information regarding the often-evoked radical monoanion form of this ligand prompted the full electronic structure investigation of these complexes using a range of techniques. Comparison of the Mössbauer spectroscopic data collected for both (Triphos)Fe(η[superscript 4]-COT) complexes with data obtained for two appropriate reference compounds indicated that they possess a low-spin Fe(I) center that is antiferromagnetically coupled to a COT radical monoanion. Further evidence for this electronic structure determination by EPR spectroscopy and cyclic voltammetry is presented. A comparison of the solid-state metrical parameters determined in this study to those of related first-row transition-metal complexes has provided insight into the electronic structure analysis of related organometallic complexes.This document is the Accepted Manuscript version of a Published Work that appeared in final form in
ORGANOMETALLICS, copyright American Chemical Society, after peer review and technical editing by the publisher.
To access the final published work, see http://dx.doi.org/10.1021/om500909
Novel Ni(0)-COT Complexes, Displaying Semiaromatic Planar COT Ligands with Alternating C−C and CC Bonds<sup>†</sup>
No full textReaction of
(R2PC2H4PR2)Ni(C2H4)
with COT gives the mononuclear complexes
(R2PC2H4PR2)Ni(η2-C8H8) (R = iPr 1a,
tBu 1b). The COT ligand in
1a,b is planar with alternating C−C and CC bonds,
corresponding
to a formal semiaromatic
[C8H8]- ligand. Reactions
of 1a with
(iPr2PC2H4PiPr2)Ni(η2,η2-C6H10)
and of 1b with
stoichiometric amounts of
{(tBu2PC2H4PtBu2)Ni}2(μ-C6H6)
or lithium afford the dinuclear complexes
{(iPr2PC2H4PiPr2)Ni}2{μ-η4(1,2,5,6):η4(3,4,7,8)-C8H8}
(2a) and
{(tBu2PC2H4PtBu2)Ni}2(μ-η2:η2-C8H8)
(2b; two isomers). The
COT ligand in 2a is tub-shaped and olefinic, whereas in
2b (as in 1a,b) it is planar and semiaromatic.
The products
are characterized by IR, solution and solid-state NMR spectroscopy, and
by X-ray structure analysis
COT
No full textThe Cloud of Things (CoT) is the multi-domain, emerging, and dynamic technology in today's era. Cloud of Things can perform security services and virtualization with different sensor devices for a powerful and scalable high-performance computing. The author emphasizes the evaluation of various applications used in Cloud of Things. The chapter has been this chapter is divided into two parts which cover the significance of the Cloud and Internet of Things. The chapter focuses on introduction of the Cloud, IoT, and CoT and shows the security and challenges occurring in CoT. It also covers the security issues in IoT with different applications. The chapter will help the academician, researchers, and industry professional to further investigate the associated area of Cloud IoT, and it also helps them find solutions from different perspectives. </jats:p
Affaire des Essais nucléaires (Australie c. France et Nouvelle-Zélande c. France). Demandes en indication de mesures conservatoires. Ordonnances du 22 juin 1973
No full textCot Jean-Pierre. Affaire des Essais nucléaires (Australie c. France et Nouvelle-Zélande c. France). Demandes en indication de mesures conservatoires. Ordonnances du 22 juin 1973. In: Annuaire français de droit international, volume 19, 1973. pp. 252-271
Cot.
No full textPatent for a cot that "may be easily and quickly applied to wagons, cars, and to all other places where beds are inconvenient" (lines 8-10). It attaches to a vertical wall
Unique DEGs of interest in the <i>cot</i> mutant (<i>cot/cot ok</i>/<i>ok</i>) treated with hyperthermia.
No full text<p>Note: Fold<sup>a</sup> indicates the ratio of RPKM of <i>cot</i>/<i>cot ok</i>/<i>ok</i> (42°C) samples divided by the RPKM of <i>cot</i>/<i>cot ok</i>/<i>ok</i> (25°C) samples.</p><p>Unique DEGs of interest in the <i>cot</i> mutant (<i>cot/cot ok</i>/<i>ok</i>) treated with hyperthermia.</p
Common differentially expressed genes in 3 strains (<i>cot/cot ok</i>/<i>ok</i>, +/+ <i>ok</i>/<i>ok</i> and +/+ +/+) after treatment with hyperthermia (42°C).
No full text<p>Note: Fold<sup>a</sup> indicates the ratio of RPKM of <i>cot</i>/<i>cot ok</i>/<i>ok</i> (42°C) sample divided by the RPKM of <i>cot</i>/<i>cot ok</i>/<i>ok</i> (25°C) samples; Fold<sup>b</sup> indicates the ratio of RPKM of <i>+/+ ok/ok</i> (42°C) sample divided by the RPKM of <i>+/+ ok/ok</i> (25°C) samples; Fold<sup>c</sup> indicates the ratio of RPKM of <i>+/+ +/+</i> (42°C) sample divided by the RPKM of <i>+/+ +/+</i> (25°C) samples.</p><p>Common differentially expressed genes in 3 strains (<i>cot/cot ok</i>/<i>ok</i>, +/+ <i>ok</i>/<i>ok</i> and +/+ +/+) after treatment with hyperthermia (42°C).</p
Mining Google and Apple mobility data: temporal anatomy for COVID-19 social distancing
No full textWe employ the Google and Apple mobility data to identify, quantify and classify different degrees of social distancing and characterise their imprint on the first wave of the COVID-19 pandemic in Europe and in the United States. We identify the period of enacted social distancing via Google and Apple data, independently from the political decisions. Our analysis allows us to classify different shades of social distancing measures for the first wave of the pandemic. We observe a strong decrease in the infection rate occurring two to five weeks after the onset of mobility reduction. A universal time scale emerges, after which social distancing shows its impact. We further provide an actual measure of the impact of social distancing for each region, showing that the effect amounts to a reduction by 20–40% in the infection rate in Europe and 30–70% in the US
Naturalness of lepton non-universality and muon g-2
No full textWe show that the observed anomalies in the lepton sector can be explained in extensions of the Standard Model that are natural and, therefore, resolve the Higgs sector hierarchy problem. The scale of new physics is around the TeV and Technicolor-like theories are ideal candidate models
- …
