The absolute fluorescence quantum yield (Φfl) of a polyfluorenyl azomethine homopolymer was measured as a function of solvent polarity. The solvent induced and temperature dependent fluorescence of the homopolymer were also investigated and they were compared to the corresponding monomer and copolymer. The Φfl of the homopolymer was consistent (45-70%), regardless of solvent polarity with Stoke...

The L-tert-leucine-derived AmidPhos/silver(I) catalytic system has been developed for the asymmetric [3+2] cycloaddition of azomethine ylides with electronic-deficient alkenes with or without Et3N. Under optimal conditions, highly functionalized endo-4-pyrrolidines were obtained with modest to high yields (up to 99% yield) and enantioselectivities (up to 98% ee).

In the title benzoyl-hydrazide derivative, C17H18N2O, the dihedral angle between the benzene rings is 88.45 (8)° and the azomethine double bond adopts an E conformation. In the crystal, mol-ecules are linked by N-H⋯O and C-H⋯O hydrogen bonds, forming a chain along the b axis.

The macrocyclic 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-7,14-dienium bromide salt (LBr) was synthesisedfor use in complexationreactions with various metal salts of copper, nickel, and zinc. Twelve complexes were synthesised; five of them were successfully obtained in a crystal form that was suitable for X-ray crystallographic analysis. All the complexes were analysedby microel...

The primary azo compound 1-(3-formyl-4-hydroxyphenylazo)-4-nitrobenzene reacts with some aliphatic and aromatic diamines and yields the corresponding azo-azomethine compounds. These compounds were characterized by elemental analysis, IR, UV/Vis, and NMR spectroscopy. The primary azo compound exists entirely in the azo form in solution as well as in the solid phase. The tautomeric structure of a...

In the title compound, [Ni(C(6)H(9)N(4)S(2))Cl], the Ni atom is in a slightly distorted square-planar environment coordinated by a Cl atom and a deprotonated thio-semicarbazone ligand via its thia-zoline N, azomethine N and thiol-ate S atoms. Short inter-molecular N-H⋯Cl and C-H⋯S contacts are present in the crystal structure.

In the title compound, [CdCl2(C13H12N4S)]·CH3OH, the coord-ination geometry of the Cd(II) ion is slightly distorted square-pyramidal, as indicated by the τ index of 0.36 (8). The S atom, two N atoms from the pyridyl-azomethine moiety and one of the Cl atoms comprise the basal plane, while the other Cl atom occupies the apical position. The hydrazinecarbo-thio-amide moiety adopts an E conformati...

4,5-Diazafluorene-9-one acylhydrazone ligands: 4,5-diazafluorene-9-one 3-methoxy benzoylhydrazone (HL), 4,5-diazafluorene-9-one 2-thiopheneacetylhydrazone (HL) and 4,5-diazafluorene-9-one isonicotinoylhydrazone (HL) and their Pb(II) complexes PbL 2 1 2H2O 1, PbL (OAc) 2 and PbL 2 3 3 have been prepared and characterized by elemental analyses, molar conductivities, IR and H NMR spectroscopy. In ...

In the present perspective the advances and real possibilities of 1,3-dipolar cycloadditions as key steps in the total synthesis of virus inhibitors are described. Azides, nitrones, and azomethine ylides are the most appropriate 1,3-dipoles for the synthesis of privileged structures with the highest biological responses against viruses.