Organometallic Complexes for Optoelectronic Applications

Recent Developments in the Application of Phosphorescent Iridium(III) Complex Systems

“…Only a few selected examples will be described in the following, and the reader is referred to recent literature published elsewhere. [1,[8][9][10][11][12][13]16,60] The two configurational isomers of tris-cyclometallated Ir III complexes notably show differences in their photophysical properties, i.e., the fac-isomers feature over an order of magnitude longer lifetimes and higher quantum efficiencies than their meridional counterparts. [23] On the other hand, Sun and co-workers described mer-Ir(mppy) 3 (mppy ¼ 2-phenyl-4-methyl-pyridine) as an exception to this general concept of only low quantum efficiencies for mer-isomers.…”

Cyclometalation Using d-Block Transition Metals: Fundamental Aspects and Recent Trends

“…Metallacycles have been successfully applied in traditional domains encompassing organic transformations and catalysis, [42][43][44][45][46][47][48] especially the catalytic activation of C-H bonds in unreactive alkanes, [49][50][51] and the stabilization of reactive intermediates. 52,53 In addition, they have been employed in various other domains of materials science, for example as active units in sensors, 54,55 in anticancer agents and for other bioorganometallic applications, [56][57][58][59] as photophysical devices in organometallic light-emitting diodes, [60][61][62] for light harvesting and energy transfer such as in photovoltaic cells, 63 as gelators 64 and birefringents in liquid crystalline materials, 65,66 and as molecular 67,68 or crystalline switches. 69 Of note for the synthetic chemist, a variety of processes other than cyclometalation have been developed in order to prepare metallacycles, especially oxidative addition involving C-X bond activation (X = F, Cl, Br, I, OTf; see eq.…”

Record Multiphoton Absorption Cross‐Sections by Dendrimer Organometalation

“…However,transition-metal-containing molecules (with adiversity of possible metals and their multiple accessible oxidation states,l igands,a nd coordination geometries) [6][7][8][9] may provide versatile means to optimize MPAproperties.Comparisons of the 2PAe fficiencies of analogous organic molecules and transition metal complexes are sparse,w hile comparisons of higher-order MPAe ffects such as three-photon absorption (3PA) are non-existent, but the very limited results thus far employing ar ange of scaling factors (molecular weight, molecular volume,e ffective number of delocalizable electrons (in an approach based on fundamental quantum principles), and cost of production) suggest that the MPA efficiencies of inorganic complexes are potentially superior to those of organic compounds. [10][11][12] Despite this tantalizing outcome,n or eports thus far have examined and directly compared the MPAe fficiencies of strictly analogous organic and transition-metal-containing dendrimers to shed light on this key concern.…”