Transition metal bicyclo[2.2.1]hept-1-yls

Bower, B. K.; Tennent, Howard G.

doi:10.1021/ja00762a056

Cited by 221 publications

(134 citation statements)

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“…Similar magnetic ions are found in other common semiconductors and remain largely unexplored [56][57][58]. Small molecules that reproduce the basic structural characteristics of the ions studied here can be synthesized [59,60] and would enable fine tuning of the local quantum environment via ligand design. Our results are, therefore, applicable to a range of transition metal ion systems and present exciting opportunities in the ongoing effort to exploit defect-localized spins for explorations in quantum science and engineering.…”

Section: Discussionmentioning

confidence: 52%

Resonant optical spectroscopy and coherent control ofCr4+spin ensembles in SiC and GaN

et al. 2017

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Spins bound to point defects are increasingly viewed as an important resource for solid-state implementations of quantum information and spintronic technologies. In particular, there is a growing interest in the identification of new classes of defect spin that can be controlled optically. Here, we demonstrate ensemble optical spin polarization and optically detected magnetic resonance (ODMR) of the S = 1 electronic ground state of chromium (Cr 4+ ) impurities in silicon carbide (SiC) and gallium nitride (GaN). Spin polarization is made possible by the narrow optical linewidths of these ensembles (<8.5 GHz), which are similar in magnitude to the ground state zero-field spin splitting energies of the ions at liquid helium temperatures. This allows us to optically resolve individual spin sublevels within the ensembles at low magnetic fields using resonant excitation from a cavity-stabilized, narrow-linewidth laser. Additionally, these near-infrared emitters possess exceptionally weak phonon sidebands, ensuring that >73% of the overall optical emission is contained with the defects' zero-phonon lines. These characteristics make this semiconductor-based, transition metal impurity system a promising target for further study in the ongoing effort to integrate optically active quantum states within common optoelectronic materials.

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Section: Discussionmentioning

confidence: 52%

Resonant optical spectroscopy and coherent control ofCr4+spin ensembles in SiC and GaN

et al. 2017

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“…It should be mentioned that at least one sufficiently stable alkylcobalt(IV) complex for isolation and characterization, [Co(norbornyl) 4 ], is known, though its stability may be attributed to the severe steric encumbrance of the ligand coordination sphere. [51,52] For the present system, an aliquot of the reaction mixture did not reveal any EPR signal after quenching to liquid nitrogen temperature. Thus, it seems that the diA C H T U N G T R E N N U N G alkyl Co IV species is either a transition state or an intermediate with too short a lifetime for measurement by this techA C H T U N G T R E N N U N G nique.…”

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confidence: 61%

Effect of Electron Donors on the Radical Polymerization of Vinyl Acetate Mediated by [Co(acac)₂]: Degenerative Transfer versus Reversible Homolytic Cleavage of an Organocobalt(III) Complex

Maria

Kaneyoshi

Matyjaszewski

et al. 2007

Chemistry A European J

146

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The molecular structure of bis(acetylacetonate)cobalt(II) ([Co(acac)2]) in solution and in the presence of the electron donors (ED) pyridine (py), NEt3, and vinyl acetate (VOAc) was investigated using 1H NMR spectroscopy in C6D6. The extent of formation of ligand adducts, [Co(acac)2(ED)x], varies in the order py>NEt3>VOAc (no interaction). Density functional theory (DFT) calculations on a model system agree with Co--ED bond strengths decreasing in the same order. The effect of electron donors on the [Co(acac)2]-mediated radical polymerization of VOAc was examined at 30 degrees C by the addition of excess py or NEt3 to the complex in the molar ratio [VOAc]0/[Co]0/[V-70]0/[py or NEt3]0=500:1:1:30 (V-70=2,2'-azobis(4-methoxy-2,4-dimethylvaleronitrile)). As previously reported by R. Jerome et al., the polymerization showed long induction periods in the absence of ED. However, a controlled polymerization without an induction period took place in the presence of ED, though the level of control was poorer. The effective polymerization rate decreased in the order py>NEt3. A similar behavior was found when these electron donors were added to an ongoing [Co(acac)2]-mediated radical polymerization of VOAc. On the basis of the NMR and DFT studies, it is proposed that the polymerization is controlled by the reversible homolytic cleavage of an organocobalt(III) dormant species in the presence of ED. Conversely, the faster polymerization after the induction period in the absence of ED is due to a degenerative transfer process with the radicals produced by the continuous decomposition of the excess initiator. Complementary experiments provide additional results in agreement with this interpretation.

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“…[15] An exception to this reductive behavior is found in the reaction of FeCl 3 with norborn-1-yllithium, which has been reported to proceed with oxidation of the metal center to give [Fe IV (norborn-1-yl) 4 ]. [16] It was suggested by the authors that "negatively charged complexes probably form" during this reaction, although these were not detected.…”

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confidence: 96%

A Square‐Planar Organoiron(III) Compound with a Spin‐Admixed State

et al. 2006

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Transition metal bicyclo[2.2.1]hept-1-yls

Cited by 221 publications

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Resonant optical spectroscopy and coherent control ofCr4+spin ensembles in SiC and GaN

Resonant optical spectroscopy and coherent control ofCr4+spin ensembles in SiC and GaN

Effect of Electron Donors on the Radical Polymerization of Vinyl Acetate Mediated by [Co(acac)₂]: Degenerative Transfer versus Reversible Homolytic Cleavage of an Organocobalt(III) Complex

A Square‐Planar Organoiron(III) Compound with a Spin‐Admixed State

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Transition metal bicyclo[2.2.1]hept-1-yls

Cited by 221 publications

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Resonant optical spectroscopy and coherent control ofCr4+spin ensembles in SiC and GaN

Resonant optical spectroscopy and coherent control ofCr4+spin ensembles in SiC and GaN

Effect of Electron Donors on the Radical Polymerization of Vinyl Acetate Mediated by [Co(acac)2]: Degenerative Transfer versus Reversible Homolytic Cleavage of an Organocobalt(III) Complex

A Square‐Planar Organoiron(III) Compound with a Spin‐Admixed State

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Effect of Electron Donors on the Radical Polymerization of Vinyl Acetate Mediated by [Co(acac)₂]: Degenerative Transfer versus Reversible Homolytic Cleavage of an Organocobalt(III) Complex