Novel dual-channel ratiometric fluorescence probe for SO detection in food and bioimaging applications based on FRET mechanism.

SO is commonly used to ensure the safety of food, but englobing of excessive SO poses serious risks to human health. Additionally, as fourth gaseous signaling molecule, it plays a critical role in various physiological processes. Therefore, monitoring the concentration of SO in food and cells is crucial for correlative research and disease diagnosis.

Visible light mediated cyclization of tertiary anilines with maleimides using nickel(II) oxide surface-modified titanium dioxide catalyst.

Surface-modified titanium dioxides by highly dispersed NiO particles have an extended absorption in the visible light region and a reduced hole-electron pair recombination than unmodified TiO2. They have now been successfully applied as highly active heterogeneous photocatalysts in the visible light mediated direct cyclization of tertiary anilines with maleimides to give tetrahydroquinoline products in moderate to high yields at ambient temperature. In contrast with unmodified titanium dioxide catalysts that are conventionally used in a stoichiometric amount in combination with UVA light, only a catalytic amount (1 mol %) of the surface-modified TiO2 catalyst is needed along with visible light to efficiently catalyze the reaction.

2-Meth-oxy-6-(6-methyl-1H-benzimidazol-2-yl)phenol.

The mol-ecule of the title compound, C(15)H(14)N(2)O(2) is almost planar, the dihedral angle between the 6-methyl-1H-benz-imidazole plane and the 2-methoxy-phenol plane being 6.9 (2)°. An intra-molecular O-H⋯N hydrogen bond is present.

{μ-6,6'-Dimeth-oxy-2,2'-[ethane-1,2-diylbis(nitrilo-methyl-idyne)]diphenolato-1κO,O,O,O:2κO,N,N',O}(methanol-1κO)(perchlorato-1κO)copper(II)sodium(I).

The mol-ecule of the title compound, [CuNa(C(18)H(18)N(2)O(4))(ClO(4))(CH(3)OH)], is almost planar with mean deviation of 5.2 (8)°. The coordination environment of the Cu(II) ion is distorted square-planar and it is N(2)O(2)-chelated by the 6,6'-dimeth-oxy-2,2'-[ethane-1,2-diylbis(nitrilo-methyl-idyne)]diphenolate Schiff base ligand.

{μ-6,6'-Dimeth-oxy-2,2'-[ethane-1,2-diyl-bis(nitrilo-methyl-idyne)]diphenolato-1κO,O,O,O:2κO,N,N',O}(methanol-1κO)(perchlorato-1κO)nickel(II)sodium.

The mol-ecule of the title compound, [NaNi(C(18)H(18)N(2)O(4))(ClO(4))(CH(3)OH)], is almost planar, the maximum deviation from the molecular plane being 5.3 (1) Å. The Ni(2+) ion is N(2)O(2) coordinated by the Schiff base ligand, leading to a slightly distorted square-planar environment.

Au-catalyzed tandem cyclization/[1,2]-alkyl migration reaction of epoxy alkynes: synthesis of spiropyranones.

A novel gold-catalyzed tandem cyclization/[1,2]-alkyl migration process of epoxy alkynes to spiropyranones has been discovered. From this process, the construction of adjacent multiple stereocenters with a new quaternary carbon atom is achieved. The gold-catalyzed domino process is stereospecific with respect to the migrating carbon atom.