The first magnesium, copper and zinc disilenides were prepared via transmetallation reactions of a lithium disilenide and structurally characterised. The copper and zinc derivatives show red-shifted UV/vis absorptions due to admixture of metal d-orbitals to the highest occupied molecular orbital.

A phosphoniafluorene and a spirobiphosphoniafluorene bearing 4-(diethylamino)styryl groups were synthesized. These compounds exhibited bathochromically shifted absorption and emission, compared with their silicon analogues, because of the strong acceptor property of the phosphonium core. They also showed enhanced two-photon absorptions at around 930 nm.

Upon irradiation a mixed-valence (MV) state is formed in a donor-iridium(III)-acceptor triad by a photoinduced electron transfer process. The resulting radical and intervalence charge transfer (IV-CT) absorptions cover a wide spectral range (3200-400 nm). These results were supported by spectroelectrochemistry, fs-time resolved pump-probe spectroscopy and assisted by TD-DFT calculations.

Abstract Ventilator-associated pneumoniae (VAP) are a major problem in intensive care units. Previous vitro experiments revealed that blue or violet luminescent endotracheal tubes capable of inhibiting bacterial growth and may thus prevent pathogens from entering the lung. However, while these studies were conducted relatively transparent suspension, subglottic secretions around can also contai...

In the optical spectra of cold post-AGB supergiant GSC 04050$-$02366, obtained with 6-meter BTA telescope a spectral resolution R$\ge$60000 on arbitrary dates over 2019$\div$2021, radial velocity variability is found. Heliocentric Vr based positional measurements numerous absorptions varies from date to standard deviation $\Delta$Vr$\approx$1.4 km/s about average value Vr=24.75 km/s, which may ...