Artemijs Krimovs

A series of novel arylalkynylpyridyl‐triazacyclononane sensitized macrocyclic europium(III) complexes (EuL) was prepared, and their circularly polarized luminescence characterized in terms of the spectral profile and dissymmetry factor ( g _lum ). The series was engineered based on previously reported isostructural complexes by a controlled introduction of structural modifications at different positions with respect to the coordination environment of the emitting europium(III) center. It was established that only those structural features of the macrocyclic ligand that were proximal to the europium(III) center affected CPL properties. These findings could help shape the development of a new class of purpose‐built EuL complexes compatible with CPL‐unaffecting complex‐stage functionalization to introduce advantageous structural features for applications in life and material sciences.

The twisting of chromophores such as perylene diimides (PDIs) into helical structures affords chiroptical properties from discrete molecules, which are of significant value for chiral sensing, imaging and catalysis. Since most helical PDI derivatives are susceptible to racemisation, chiral induction provides a promising, yet underdeveloped, strategy for generating materials with persistent chiroptical properties. For the first time, we use a mechanically planar chiral rotaxane as a configurationally stable chirality source to induce single‐handed helicity in a molecular chromophore, yielding persistent circular dichroism and circularly polarised luminescence. The large π‐surface of the PDI also enables rotaxane self‐assembly, which is rare among mechanically interlocked molecules. While mechanical bonding is shown to influence the geometry of the resulting PDI dimers, mechanical planar chirality directs their handedness, thereby providing control at both the molecular and supramolecular levels.

The twisting of chromophores such as perylene diimides (PDIs) into helical structures affords chiroptical properties from discrete molecules, which are of significant value for chiral sensing, imaging and catalysis. Since most helical PDI derivatives are susceptible to racemisation, chiral induction provides a promising, yet underdeveloped, strategy for generating materials with persistent chiroptical properties. For the first time, we use a mechanically planar chiral rotaxane as a configurationally stable chirality source to induce single‐handed helicity in a molecular chromophore, yielding persistent circular dichroism and circularly polarised luminescence. The large π‐surface of the PDI also enables rotaxane self‐assembly, which is rare among mechanically interlocked molecules. While mechanical bonding is shown to influence the geometry of the resulting PDI dimers, mechanical planar chirality directs their handedness, thereby providing control at both the molecular and supramolecular levels.