THE ASYMMETRIC ALKYLATIONS OF CHIRAL TRANSITION METAL COMPLEXES OF(+)—CAMPHOR IMINE

The asymmetric alkylations of chiral transition metal complexes derived from (+)-camphor and 2-aminomethyl-6-methylpyridine were examined under mild conditions.The formation of the complexes 2 is conductive to the enhancement of di- astereoselectivity in the alkylations at room temperature.

Studies on the Binding of Tris(1,10-phenanthroline) Nickel(Ⅱ) to Calf Thymus DNA

Absorbance and fluorescence methods were used to study the interaction of - and A-tris (phenanthroline) nickel ( Ⅱ) complex with calf thymus DNA. It was con- cluded that -Ni(phen). preferentially bound to DNA. Especially the fluorescence Scatchard plots were discussed for the binding of EthBr to calf thymus DNA in the presence of varying concentrations of the metal complex. Theses studies indicated that both the isomers bound to DNA by two acting types , namely , intercalative and electrostatic bound modes.

Synthesis of Enantiom eric Planar Square Ni^(2+) -and Cu^(2+) -Schiff Base Com plexes

Enantiomeric four chelated planar square schiff base Cu 2+ and Ni 2+ complexes were synthesized using ( 1R,trans ) and ( 1S,trans) N,N bis(2 hydroxyphenyl methylene) 1,2 diaminocyclohexane. The chirality could not be shown by usual UV Vis spectra. The intrinsic chiral difference of the enantiomeric complexes can be displayed by circular dichroism(CD) spectra. The Cotton effect of every polarlight sensitive absorption of one enantiomer will be the opposite of that of the other enantiomer. It was found that no tetrahedron form exists for Ni 2+ complexes, which was determined with UV Vis spectra and Electron Paramagnetic Resonance(EPR) measures.

Circularly polarized luminescence of coordination aggregates

The development and applications of materials with efficient circularly polarized luminescence(CPL)have become an interdisciplinary frontier research topic.We summarize herein the recent advance in the development and applications of CPLactive aggregates based on metal-ligand coordination materials(termed as“coordination aggregates”).The materials surveyed are classified as aggregates of smallmolecular metal complexes,which include monocomponent assemblies of Pt(II)complexes and other complexes and binary aggregates of metal complexes,and CPL-active metal-ligand coordination helicates,polymers,and frameworks.The efforts in improving the dissymmetry luminescence factors and quantum yields of these materials and the use of the aggregation strategy in enhancing the performance of isolated molecules are discussed.The recent applications of chiral metal complexes in circularly polarized organic light-emitting diodes(OLEDs)based on solution-or evaporation-processed procedures are surveyed.In addition,the uses of lanthanide complexes in CPL-contrast imaging and as CPL probes are highlighted.The common discussion on the mechanism of aggregation-enhanced CPLs and a perspective on future works of CPL-active coordination aggregates are finally given.