The complementary methods of MicroED and GIWAXS provide insight into crystal structure arrangement in organic semiconductor thin films.

An aqueous photocatalytic system exploits photophysical properties arising from the formation of supramolecular hydrogels, with properties and assembly modulated by the amino acids appended to an organic chromophore.

Density functional studies are performed to understand the role of chelating bi-phosphine ligands [(Ph 2 P(CH 2) m PPh 2); m = 1-4] in modulating the regio-selectivity of benzoic acid addition to 1-hexyne, in presence of ruthenium(II) catalyst [(Ph 2 P(CH 2) m PPh 2)Ru(methallyl) 2 ]. The Markovnikov addition to 1-hexyne is observed when catalyst 1 a [(Ph 2 P(CH 2)PPh 2)Ru(methallyl) 2 ] is employed, whereas a reverse regio-selectivity is witnessed in presence of 1 d [(Ph 2 P(CH 2) 4 PPh 2)Ru(methallyl) 2 ]. Anti-Markovnikov addition occurs via the neutral vinylidene intermediates (5 a/d) formed after 1,2-hydrogen shift in hexyne coordinated ruthenium(II) complexes 3 a/d. The energy profile shows clear preference for Markovnikov addition by 15.0 kcal/mol (G S L) in case of catalyst system 1 a. In contrast, anti-Markovnikov pathway following neutral vinylidenes are more favourable by 9.1 kcal/mol (G S L) for catalyst system 1 d .T h eZ-enol ester formation is more predominant in the anti-Markovnikov pathway since the activation barrier for this step requires less energy (5.9 kcal/mol, G S L) than the one furnishing the E-product. The calculated results are in good agreement with the reported experimental findings.

Organic semiconductors have received substantial attention as active components in optoelectronic devices because of their processability and customizable properties.

Tuning solubility and mechanical activation alters the stereoselectivity of the [2+2] photochemical cycloaddition of acenaphthylene. Photomechanochemical conditions produce the syn cyclobutane, whereas the solid-state reaction in the absence of mechanical...

Correction for ‘Visible-light photooxidation in water by 1O2-generating supramolecular hydrogels’ by Sankarsan Biswas et al., Chem. Sci., 2020, 11, 4239–4245, DOI: 10.1039/C9SC06481H.