Application Values of Two Cu(II) Schiff Base Coordination Complexes on Blue Fluorescent Materials

Two Schiff base binuclear Cu(II) compounds, [Cu2(L)2·(H2O)2]·2DMF (1) together with its coordination polymer (CP) [Cu2(L)2·(4,4'-bpy)2]n (2) (H2L is 4-hydroxy-3-((2-hydroxy-5-mercaptobenzylidene)amino)-2H-chromen-2-one and 4,4'-bpy is 4,4'-bipyridine), were generated under an identical experimental environment in the absence and existence of auxiliary ligand 4,4'-bpy. Fluorescence spectroscopy testing shows that the ligand-based blue fluorescence emission offers potential for application as a blue photoluminescent material.

Absolute asymmetric synthesis of five-coordinate complexes

Three examples of optical resolution of five-coordinate complexes displaying only achiral mono- or bidentate ligands are reported.

A Zn-oxalate helix linked by a water helix: spontaneous chiral resolution of a Zn helical coordination polymer

Two enantiomers of a Zn helical coordination polymer have been obtained from spontaneous resolution. In this compound, homochiral Zn-oxalate helices are linked by water helices comprising coordinated and guest water.

A missing link between chiral four- and five-coordinate complexes

A stereochemically labile complex, intermediate between square planar and distorted five-coordinate, was obtained in enantiomerically pure form through total spontaneous resolution.

Effect of non-covalent interaction on the diastereoselective self-assembly of Cu(ii) complexes containing a racemic Schiff base in a chiral self-discriminating process

The effects of π⋯π interactions between benzene–pyridine rings on the diastereoselective self-assembly of Cu(ii) compounds in the chiral self-discrimination process are studied.

Strong intermolecular exciton couplings in solid-state circular dichroism of aryl benzyl sulfoxides

A series of 13 enantiopure aryl benzyl sulfoxides () with different substituents on the two aromatic rings has been previously analyzed by means of electronic circular dichroism (CD) spectroscopy. Most of these compounds are crystalline and their X-ray structure is established. For almost one-half of the series, CD spectra measured in the solid state were quite different from those in acetonitrile solution. We demonstrate that the difference is due to strong exciton couplings between molecules packed closely together in the crystal. The computational approach consists of time-dependent density functional theory (TDDFT) calculations run on "dimers" composed of nearest neighbors found in the lattice. Solid-state CD spectra are well reproduced by the average of all possible pairwise terms. The relation between the crystal space group and conformation, and the appearance of solid-state CD spectra, is also discussed.