But as viscosity increases during cure, the dye molecules' freedom of
molecular rotation is inhibited.
The key discovery is that in certain types of coordination complexes based on carbene ligands the excited singlet state sinks below the excited triplet state during
molecular rotation. To our knowledge this is the first realization of "spin-state inverted" materials, until now discussed only as a theoretical concept.
Their interaction in quiescent samples has been well studied (12-14), the major finding being that disclinations of opposite topological charge (i.e., opposite
molecular rotation) attract and annihilate one another just as their electrostatic counterparts.
1) Complete control and real time monitoring of
molecular rotation inside liquid helium droplets, exploring superfluidity of the droplets, the possible formation of quantum vortices, and rotational dephasing due to interaction of the dissolved molecules with the He solvent.
In addition to thermal stress, mechanical stress occurs due to the hindrance of
molecular rotations and due to shear and tensile stresses of screw plasticizing and melt injection.
