The invention discloses a
crown ether element-based N-heterocyclic
carbene ligand, an
assembly and a preparation method thereof, and belongs to the technical field of
chemical synthesis. The chemical
structural formula of the ligand is shown in any one of the formula and the formula, and R is any one of methyl, ethyl, propyl and butyl. According to the present invention, the
crown ether base plate is provided, and the imidazolium salt unit is pre-fixed at the specific position and the specific orientation, such that the problem of the synthesis of the N-heterocyclic
carbene ligand having the functional base plate is solved, and the accurate and predictable control on the final
assembly structure is achieved; according to the present invention, the rigidity of the
assembly is enhanced through the coordination of the N-heterocyclic
carbene ligand and the
metal, and the host-guest interaction of the
crown ether and the
alkali metal has a certain dynamic reversibility, such that the assembly can be conveniently adjusted through the external stimulation (such as the competitive
ion) so as to further prolong the
phosphorescence life of the assembly, and the possibility is provided for the development of the stimuli-responsive
phosphorescence material; wide application prospects are realized.