Abstract. Photo-chemically induced dynamic nuclear polarization (photo-CIDNP) was used to observe the light-induced disproportionation reaction of 6,7,8-trimethyllumazine starting out from its triplet state generate a pair radicals comprising one-electron reduced and oxidized species. Our evidence is based on measurement two marker proton hyperfine couplings, Aiso(H(6α)) Aiso(H(8α)), which we c...

Constructing products of high synthetic value from inexpensive and abundant starting materials is of great importance. Aryl iodides are essential building blocks for the synthesis of functional molecules, and efficient methods for their synthesis from chemical feedstocks are highly sought after. Here we report a low-cost decarboxylative iodination that occurs simply from readily available benzo...

An investigation of the new synthetic method to synthesize regioregular, head-to-tail coupled poly(3-alkylthiophenes) using magnesium-halogen exchange (Grignard metathesis) called the GRIM method is described. Treatment of 2,5-dibromo-3-alkylthiophenes with a variety of alkyl and vinyl Grignard reagents resulted in two metalated, regiochemical isomers, namely, 2-bromo-3-alkyl-5-bromomagnesiothi...

We simulate the dynamics of triplet-triplet energy transfer in a donor-bridge-acceptor system [4-(2-naphthylmethyl)benzaldehyde] with surface hopping, using electronic energies, gradients, and derivative couplings that are calculated on the fly. Using Boys localization to diabatize electronic states, we calculate energy transfer rates that agree favorably with experiment. The atomistic nature o...

Natural availability of carbonyl groups offers reductive carbonyl coupling tremendous synthetic potential for efficient olefin synthesis, yet the catalytic carbonyl cross-coupling remains largely elusive. We report herein such a reaction, mediated by hydrazine under ruthenium(ii) catalysis. This method enables facile and selective cross-couplings of two unsymmetrical carbonyl compounds in eithe...

By means of a model-independent analysis, we discuss the constraints on anomalous trilinear gauge-boson couplings that can be obtained from the study of electron-positron annihilation into W pairs at LC with √ s = 0.5 TeV and 1 TeV . We consider the general CP conserving anomalous effective Lagrangian, as well as some specific models with reduced number of independent couplings. The analysis is...

Within a fully microscopic setting, we derive a variational principle for the non-equilibrium steady states of chemical reaction networks, valid for time-scales over which chemical potentials can be taken to be slowly varying: at stationarity the system minimizes a global function of the reaction fluxes with the form of a Hopfield Hamiltonian with hebbian couplings, that is explicitly seen to c...

The improved peri-implant bone response demonstrated when utilizing the platform-switching concept may result from reduced levels of metal ions released implant–abutment surfaces to surrounding tissues. These corrosion products play a major role in crestal remodeling around dental implants. This study evaluated effect different couplings (platform-matched vs. platform-switched) on osteoblasts’ ...

Predictive Higgs-fermion couplings can be obtained when a specific texture for the fermion mass matrices is included in the general two-Higgs doublet model. We derive the form of these couplings in the charged lepton sector using a Hermitian mass matrix Ansatz with four-texture zeros. The presence of unconstrained phases in the vertices φililj modifies the pattern of flavor-violating Higgs inte...

We report here on the analysis of γp → K * 0 Σ + reaction which has not been studied previously, because of its small cross section. The availability of the high intensity electron facility and the CEBAF Large Acceptance Spectrometer (CLAS) at JLab has made it possible to study this channel. Data were taken at 3.115 GeV electron beam energy using tagged photons incident upon a liquid hydrogen t...