Reflection, luminescence-excitation, luminescence decay kinetics, photo-stimulated luminescence, and photo-induced infrared absorption have been measured for ZnWO 4 crystals in the temperature range of 6−300 K. The results are compared with the previous data. The optical properties of ZnWO 4 are discussed on the basis of the present results, as well as the result of the relativistic molecular orbital calculation.

The anionic dinitrogen complex [NBudCWCNCSXNaXdppeh] (6, dppe = PhzPCE^CHaPPl^) smoothly reacted with p6-fluoroarene complexes such as [CrC^-p-FCe^RXCOh] (3a, R = COOMe) and ][PF6] (5, Cp = í/5-C5H5, R = H, Me, OMe, COOMe) in THF under mild conditions (0 °C to room temperature) to give novel µ-aryldiazenido complexes [W(NCS){N=N[(i/6-p-C6H4COOMe)Cr(CO)3]}(dppe)2] (7) and [W(NCS){N=N[(p6-p-C6H4R)-RuCp]}(dppe)2][PFe] (10), respectively. µ-Aryldiazenido complexes 7 and [WF{N=N[(p6-p-CeHtRXMCOhlXdppeh] (8a, R = COOMe) were also obtained by irradiation of a THF solution of [W(N2Mdppe)2] and 3a in the presence of NBu^iX = SCN or F). The structures of these complexes were fully characterized by spectroscopic and X-ray diffraction analysis.The long N=N bond lengths (1.314(5) Á for 7, 1.33(1) Á for 8a, 1.28(1) Á for 10a (R = H)) and the short N-C bond lengths (1.366(6) Á for 7, 1.30(2) Á for 8a, and 1.40(2) Á for 10a) indicate delocalization of the N=N -electrons over the aromatic ring. The reaction was suggested to proceed by the direct nucleophilic aromatic substitution mechanism, rather than the radical mechanism so far reported for alkylation reactions of coordinated dinitrogen. Furthermore, reactions of the diazenido complex [WF(NNH)(dppe)2] (12) with fluoroarene complexes 3 (R = COOMe, H) and [FeCp(p6-FC6H4R)][PFe] (4; R = H, Me) also provide a route to µ-aryldiazenido complexes such as 8 and [WF{N=N[(p6-p-C6H4R)FeCp]}(dppe)2]- [PF6] (13), respectively. Crystallographic data for 7*CH2Cl2: formula C65H57N3O5SP.1CI2-CrW, space group P2Jn (monoclinic); o = 24.135(3) Á, b = 20.967(5) Á, c = 12.273(5) Á, ß = 90.06(4)°, V = 6210(5) Á3, Z = 4, R = 0.034, Rw = 0.029. 8a-2THF: formula C71H71N2O7-FP4CrW, space group P2i/o (monoclinic); a = 23.110(5) Á, b = 23.402(7) Á, c = 12.046(3) Á, ß = 93.89(2)°, V = 6500(3) Á3, Z = 4, R = 0.056, i?w = 0.066. 10a-CH2Cl2: formula C65H6oN3F6-SP5CI2RUW, space group PI (triclinic); a = 12.630(2) Á, b = 23.648(3) Á, c = 11.

A container used in contact lens cleaning requires a Pt plating weight of 1.5 mg for H2O2 decomposition although Pt is an expensive material. Techniques that decrease the amount of Pt are therefore needed. In this study, Pt nanoparticles instead of Pt plating film were supported on a substrate of acrylonitrile–butadiene–styrene copolymer (ABS). This was achieved by the reduction of Pt ions in an aqueous solution containing the ABS substrate using high-energy electron-beam irradiation. Pt nanoparticles supported on the ABS substrate (Pt-particle/ABS) had a size of 4–10 nm. The amount of Pt required for Pt-particle/ABS was 250 times less than that required for an ABS substrate covered with Pt plating film (Pt-film/ABS). The catalytic activity for H2O2 decomposition was estimated by measuring the residual H2O2 concentration after immersing the catalyst for 360 min. The Pt-particle/ABS catalyst had a considerably higher specific catalytic activity for H2O2 decomposition than the Pt-film/ABS catalyst. In addition, sterilization performance was estimated from the initial rate of H2O2 decomposition over 60 min. The Pt-particle/ABS catalyst demonstrated a better sterilization performance than the Pt-film/ABS catalyst. The difference between Pt-particle/ABS and Pt-film/ABS was shown to reflect the size of the O2 bubbles formed during H2O2 decomposition.

A method for the highly regio- and enantioselective oxidative coupling of resorcinols has been established by using dibrominated dinuclear vanadium­(V) catalyst 1c under air. When resorcinols bearing an aryl substituent were applied as substrates to the coupling, axially chiral biresorcinols were obtained as single regioisomers in high yield with up to 98% ee.

This paper presents direct searches for lepton flavour violation in Higgs boson decays, H → eτ and H → μτ, performed using data collected with the ATLAS detector at the LHC. The searches are based on a data sample of proton-proton collisions at a centre-of-mass energy $$ \sqrt{s} $$ s = 13 TeV, corresponding to an integrated luminosity of 138 fb−1. Leptonic (τ → ℓνℓντ) and hadronic (τ → hadrons ντ) decays of the τ-lepton are considered. Two background estimation techniques are employed: the MC-template method, based on data-corrected simulation samples, and the Symmetry method, based on exploiting the symmetry between electrons and muons in the Standard Model backgrounds. No significant excess of events is observed and the results are interpreted as upper limits on lepton-flavour-violating branching ratios of the Higgs boson. The observed (expected) upper limits set on the branching ratios at 95% confidence level, $$ \mathcal{B} $$ B (H → eτ) < 0.20% (0.12%) and $$ \mathcal{B} $$ B (H → μτ ) < 0.18% (0.09%), are obtained with the MC-template method from a simultaneous measurement of potential H → eτ and H → μτ signals. The best-fit branching ratio difference, $$ \mathcal{B} $$ B (H → μτ) → $$ \mathcal{B} $$ B (H → eτ), measured with the Symmetry method in the channel where the τ-lepton decays to leptons, is (0.25 ± 0.10)%, compatible with a value of zero within 2.5σ.