Supramolecular Assembly of Metal‐Ligand Chromophores for Sensing and Phosphorescent OLED Applications

Abstract

The exploration of phosphorescent materials based on transition metal-ligand chromophoric complexes represents an important area of research in molecular materials. The knowledge and fundamental understanding of their photophysical properties offer a possible fine-tuning of their electronic absorption and luminescence properties. The strong propensity of d(8) transition metal compounds to form non-covalent metal···metal interactions facilitates supramolecular assembly and the formation of supramolecular nanostructures with interesting photophysical properties. The introduction of supramolecular assembly with hierarchical complexity involving non-covalent interactions could lead to research dimensions of unlimited possibilities and opportunities. This article briefly summarizes the latest progress on the use of d(8) metal-ligand chromophores as chemosensors, as exemplified by alkynylplatinum(II) complexes with emphasis on supramolecular assembly involving non-covalent interactions, and the recent advances in the utilization of d(8) metal-ligand phosphors, as exemplified by alkynylgold(III) system, for the exploration and development of phosphorescent OLEDs.

Green‐Light‐Emitting Diodes based on Tetrabromide Manganese(II) Complex through Solution Process

“…Large Stokes shifts ( Figure S1, Supporting Information) together with microsecond range of emissive lifetimes are indicative of a triplet excited state with phosphorescent character. [4][5][6][7][8] In 1998, phosphorescent heavy-metal complexes with platinum(II) or iridium(III) were utilized by Forrest and co-workers as emitting materials, [9,10] which enhanced significantly electroluminescent (EL) efficiency by taking advantage of both singlet and triplet excitons and thus accelerated greatly the commercialization process of OLEDs. [31][32][33] The excitation spectrum ( Figure S1, Supporting Information) shows structured bands with three maxima at 300, 365, and 460 nm because of the energy splitting in the 4 T 1 excited state with C 2v symmetry.…”

Recent Advances in Phosphorescent Pt(II) Complexes Featuring Metallophilic Interactions: Properties and Applications

“…Change of such properties can be hence used to probe dynamic transformation of the supramolecular assemblies. 7,10,36 As a result, a rich variety of supramolecular functional architectures has been reported which range from pseudo-0D structures such as micelles, to 1D arrays, to 2D layers, and up to 3D networks. As consequence of their squareplanar molecular geometry, the most commonly observed selfassembly form is certainly fibrils (1D) that often tend to bundle into entangled 3D networks leading, in some cases, to the formation of supramolecular gels.…”

Seven‐Coordinate Luminophores: Brilliant Luminescence of Lanthanide Complexes with C3v Geometrical Structures

“…[1][2][3] A typical luminescent metal complex is composed of one metal ion and characteristic organic ligands in a three-dimensional structure. The three-dimensional geometries of coordination structures dominate their photochemical and photophysical properties.…”