A new π-conjugated macromolecule (M1) having fused pentacyclic N-bridged dithienopyrrolobenzothiadiazole core unit with carbazole capping linked by vinyl spacers at both ends was synthesized and characterized by nuclear magnetic resonance (1 H and 13 C) and high resolution mass-spectrometry techniques. Photophysical properties of compound M1 was studied by absorption and emission spectroscopy. Compound M1 showed optical HOMO-LUMO gap of 2.2 eV. Compound M1 showed a solvatochromic effect in fluorescence spectroscopy. DFT calculation showed that M1 possesses nearly planar geometry. The space charge limited current hole mobility of M1 was found to be 3.85 × 10 −4 cm

The utility of a chiral Ru–prolinamide catalytic system has been demonstrated in one-pot synthesis of optically active β-triazolylethanol and β-hydroxy sulfone derivatives. The said methodology proceeds through asymmetric transfer hydrogenation of in situ formed ketones of the corresponding chiral products. Various chiral prolinamide ligands were screened, and ligand L6 with isopropyl groups substituted at the ortho position has shown excellent activity at 60 °C in aqueous medium producing up to 95% yield and 99.9% enantioselectivity.

Benzimidazole substituted indolo [3,2-b]carbazole derivatives (5 and 6) were synthesized by formylation of N,N'-dioctylindolo [3,2-b]carbazole followed by reaction with o-phenyelene diamine. The structures of these two compounds were characterized by high resolution mass-spectrometry (HRMS) and NMR ( 1 H and 13 C) spectroscopy. Their photophysical and electrochemical properties were studied by absorption and emission spectroscopy and cyclic voltammetry. Compounds 5 and 6 showed sensitivity towards acid in solution as well as in the solid state. Density functional theory (DFT) studies showed that compound 5 is more planar compared to 6. Frontier molecular orbitals (FMO) analysis suggested that photoinduced electron transfer (PET) from indolo[3,2-b]carbazole moiety (fluorophore) to the protonated benzimidazole unit results in quenching.[a] V.