Binuclear C^C* Cyclometalated Platinum(II) NHC Complexes with Bridging Amidinate Ligands

Leopold, Hendrik; Tenne, Mario; Tronnier, Alexander; Metz, Stefan; Münster, Ingo; Wagenblast, Gerhard; Straßner, Thomas

doi:10.1002/anie.201607075

Cited by 48 publications

(71 citation statements)

References 47 publications

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“…The beneficial effect of carbene moieties on the photophysical features of the dopant was also shown by Strassner and co-workers [36–38]. Compared with previously reported imidazolylidene and triazolylidene acetylacetonate (acac) platinum(II) complexes, complexes 12 bearing 1,3-thiazol-2-ylidene carbenes outperformed the former when evaluating the photophysical properties (Fig.…”

Section: Reviewsupporting

confidence: 53%

Recent advances in phosphorescent platinum complexes for organic light-emitting diodes

Cebrián

Mauro

2018

Beilstein J. Org. Chem.

150

114

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Phosphorescent organometallic compounds based on heavy transition metal complexes (TMCs) are an appealing research topic of enormous current interest. Amongst all different fields in which they found valuable application, development of emitting materials based on TMCs have become crucial for electroluminescent devices such as phosphorescent organic light-emitting diodes (PhOLEDs) and light-emitting electrochemical cells (LEECs). This interest is driven by the fact that luminescent TMCs with long-lived excited state lifetimes are able to efficiently harvest both singlet and triplet electro-generated excitons, thus opening the possibility to achieve theoretically 100% internal quantum efficiency in such devices. In the recent past, various classes of compounds have been reported, possessing a beautiful structural variety that allowed to nicely obtain efficient photo- and electroluminescence with high colour purity in the red, green and blue (RGB) portions of the visible spectrum. In addition, achievement of efficient emission beyond such range towards ultraviolet (UV) and near infrared (NIR) regions was also challenged. By employing TMCs as triplet emitters in OLEDs, remarkably high device performances were demonstrated, with square planar platinum(II) complexes bearing π-conjugated chromophoric ligands playing a key role in such respect. In this contribution, the most recent and promising trends in the field of phosphorescent platinum complexes will be reviewed and discussed. In particular, the importance of proper molecular design that underpins the successful achievement of improved photophysical features and enhanced device performances will be highlighted. Special emphasis will be devoted to those recent systems that have been employed as triplet emitters in efficient PhOLEDs.

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Section: Reviewsupporting

confidence: 53%

Recent advances in phosphorescent platinum complexes for organic light-emitting diodes

Cebrián

Mauro

2018

Beilstein J. Org. Chem.

150

114

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“…[19] Using chelating ligands having carbanion or carbene,y ellow to green emission originating from 3 MMLCT has been reported (Table S1). [20][21][22][23][24] However,ablue emission originating from 3 MMLCT has not been achieved yet. Fort his purpose,t he introduction of al igand with moderate p-conjugation and p-accepting properties is important in addition to the construction of weak Pt•••Pt stacks.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, strong ligand fields are favorable for highly efficient luminescence because the rise of the dd state would suppress nonradiative deactivation, while rigid structures would suppress vibrational deactivation . Using chelating ligands having carbanion or carbene, yellow to green emission originating from 3 MMLCT has been reported (Table S1) . However, a blue emission originating from 3 MMLCT has not been achieved yet.…”

Section: Introductionmentioning

confidence: 99%

Intense Red‐Blue Luminescence Based on Superfine Control of Metal–Metal Interactions for Self‐Assembled Platinum(II) Complexes

et al. 2020

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Aseries of assembled Pt II complexes comprising Nheterocyclic carbene and cyanide ligands was constructed using different substituent groups,[ Pt(CN) 2 (R-impy)] (R-impyH + = 1-alkyl-3-(2-pyridyl)-1H-imidazolium, R = Me (Pt-Me), Et (Pt-Et), i Pr (Pt-i Pr), and t Bu (Pt-t Bu)). All the complexes exhibited highly efficient photoluminescence with an emission quantum yield of 0.51-0.81 in the solid state at room temperature,originating from the triplet metal-metal-toligand charge transfer (3 MMLCT) state.Their emission colors cover the entire visible region from red for Pt-Me to blue for Pt-t Bu.I mportantly, Pt-t Bu is the first example that exhibits blue 3 MMLCT emission. The 3 MMLCT emission was proved and characterized based on the temperature dependences of the crystal structures and emission properties.T he wide-range color tuning of luminescence using the 3 MMLCT emission presents an ew strategy of superfine control of the emission color.

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“…ORTEP representation of complex 5.Thermal ellipsoids set at 30 %probability. [12] Angewandte Chemie Communications trations ( Figure S13) are indicative of the presence of strong spin-orbit coupling, which can be seen as additional proof for the metal-metal interaction.…”

mentioning

confidence: 99%