Schiff-base [4]helicene Zn(ii) complexes as chiral emitters

Abstract

The controlled preparation of chiral emissive transition metal complexes is fundamental in the field of circularly polarized luminescence (CPL) active molecular materials. For this purpose, enantiopure Zn(II) complexes 1-2 based...

Circularly polarized luminescence and magneto-optic effects from chiral Dy(iii) single molecule magnets

“…5b) and is comparable with the reported CPL intensity of chiral Schiff-base [4] helicene Zn 2+ complexes. 52…”

Efficient emission of Zn(ii) and Cd(ii) complexes with nopinane-annelated 4,5-diazafluorene and 4,5-diazafluoren-9-one ligands: how slight structural modification alters fluorescence mechanism

“…Zinc( ii ) and cadmium( ii ) complexes establish one of the most important classes of emissive compounds. 71–121 Earlier, we synthesized a series of mononuclear zinc( ii ) and cadmium( ii ) complexes with hybrid ligands containing a 2,2′-bipyridine moiety and natural terpene (+)-limonene or (+)-3-carene moieties and demonstrated that they exhibit luminescence with the quantum yield increasing in the following order: free ligand < cadmium( ii ) complex < zinc( ii ) complex. 122 The complexes with the limonene derivative demonstrate excitation wavelength–dependent emission with nanosecond and microsecond lifetimes of the excited states.…”

Chiral Emissive Lanthanide Complexes from Enantiopure [6]Helicene‐bis(pyrazolyl)‐pyridine Ligands

“…[10,11] Moreover, very recently, the use of azahelicene appended pyridine ligands [8] allowed the preparation of an ytterbium(III) complex showing strong magneto-chiral dichroism. [12] In the frame of our own interest in functional helicenes, [13,14] and their transition metal complexes, [9,15] we have recently reported the series of 2,6bis(pyrazol-1-yl)pyridine (1-bpp) ligands substituted by racemic [4]-, [5]-and [6]helicene units in the 4-position of the pyridine ring, together with the photophysical properties of their luminescent Re(I) and Ru(II) complexes. [16] While a large variety of functionalized 1-bpp and corresponding transition metal complexes have been reported, [17,18] chiral derivatives have received little attention so far, [19,20] especially driven by catalytic applications, [21,22] but not for emission or chiroptical properties.…”