Nanoimprint Lithography‐Directed Self‐Assembly of Bimetallic Iron–M (M=Palladium, Platinum) Complexes for Magnetic Patterning

Meng, Zhengong; Li, Guijun; Yiu, Sze Chun; Zhu, Nianyong; Yu, Zhen; Leung, Chi Wah; Manners, Ian; Wong, Wai Yeung

doi:10.1002/anie.202002685

Cited by 24 publications

(7 citation statements)

References 48 publications

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“…Our group has been long engaged in the field of functional transition-metal complexes − and proposed effective molecular design strategies toward high-performance iridophosphors. , In 2006, the carbazole unit was selected by us to design a new cyclometalating ligand showing π extended skeleton 9-phenyl-3-(pyridin-2-yl)-9 H -carbazole for constructing a multifunctional iridium complex fac -Ir(Cz-py) 3 (Figure ). The carbazole moiety within the ligand of the complex could reduce its ionization potential and facilitate the hole transport ability, thereby enhancing the OLED performance compared with that of fac -Ir(ppy) 3 .…”

Section: Molecular Design Strategies and General Synthesismentioning

confidence: 99%

Asymmetric Tris-Heteroleptic Cyclometalated Phosphorescent Iridium(III) Complexes: An Emerging Class of Metallophosphors

et al. 2022

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Metrics & MoreArticle Recommendations * sı Supporting Information CONSPECTUS:The rapid developments of cutting-edge research on photofunctional organic semiconductor materials are greatly promoting the progress of science and technology. As one of the most important organic semiconductor materials, phosphorescent iridium(III) complexes are a promising class of organometallic emitters because of their rich emissive excited states together with excellent chemical stability, which have been widely used in various fields, such as organic electroluminescence, solar cells, photocatalysis, biosensing, bioimaging, cancer therapy, etc. The exploration of highly efficient phosphorescent iridium(III) complexes showing various structural features is blooming quickly.In general, the traditional iridium(III) phosphors usually contain at least two identical cyclometalating bidentate ligands. These iridophosphors with two identical bidentate ligands are termed as the bis-heteroleptic complex Ir((L 1 ) 2 L 2 ), where L denotes the free ligand or the deprotonated form of the free ligand. Those with three identical ligands are called homoleptic complex Ir(L) 3 .Recently, the iridium(III) complexes Ir(L 1 L 2 L 3 ) supported by three different (cyclometalating) ligands are emerging as a novel and interesting category of phosphors. This class of iridophosphors usually refers to tris-heteroleptic cyclometalated phosphorescent iridium(III) complexes, and they usually show the asymmetry in their molecular structures. Compared with the case for the traditional iridium(III) phosphors, the independent ligand control provides tris-heteroleptic iridium(III) phosphors with more flexible molecular design/synthesis and excited-state fine-tuning ability, thereby resulting in more rich and appealing excited states and potential multifunctional applications.In this Account, we will highlight our recent efforts on the asymmetric tris-heteroleptic cyclometalated iridium(III) phosphors including the molecular design strategies, chemical synthesis, excited-state tuning, and structure−property relationships as well as their applications, especially in organic electroluminescence. Specifically, the molecular design of tris-heteroleptic iridium(III) phosphors focuses on the independent ligand design including the following three aspects: (1) the substituent functionalization engineering (SFE); (2) the ligand skeleton engineering (LSE); (3) the double metalation engineering (DME). For SFE, we mainly introduce the substituent based on the main-group element into the ligand of iridophosphors and also investigate the influence of the substituent position on the emissive excited states of iridophosphors. For instance, the main-group elements show unique electronic effects, which could contribute to the manipulation of the photoelectric properties of complexes (e.g., balanced charge transport ability, improved utilization of excitons, etc.). For LSE, different types of aromatic skeleton or various lengths of π conjugation of the ligands are also examined for t...

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Section: Molecular Design Strategies and General Synthesismentioning

confidence: 99%

Asymmetric Tris-Heteroleptic Cyclometalated Phosphorescent Iridium(III) Complexes: An Emerging Class of Metallophosphors

et al. 2022

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“…As expected, the patterns before and after pyrolysis agree well with the pre-defined structure of the PDMS stamp, and the distinct magnetization signals are also consistent with the related magnetic islands in the AFM images. 222 This strategy opens a new avenue on the precise control of patterns and holds good potential for magnetic data recording.…”

Section: Osv and Mtj Based On Metal-containing Organic Compoundsmentioning

confidence: 99%

Metal-containing organic compounds for memory and data storage applications

et al. 2022

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“…Nevertheless, patterning multimetallic nanomaterials remains challenging, mainly due to the difficulty in tunning multiple metal–substrate and metal–metal interactions simultaneously at predefined positions, especially for patterns with more than three metal elements 22 , 23 . Only in combination with top-down techniques, multimetallic nanoparticles could be assembled in a confined space that still has geometrical restrictions from imprinting methodology 24 .…”

Section: Introductionmentioning

confidence: 99%

High-entropy alloy nanopatterns by prescribed metallization of DNA origami templates

Xie

Fang

et al. 2023

Nat Commun

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High-entropy multimetallic nanopatterns with controlled morphology, composition and uniformity hold great potential for developing nanoelectronics, nanophotonics and catalysis. Nevertheless, the lack of general methods for patterning multiple metals poses a limit. Here, we develop a DNA origami-based metallization reaction system to prescribe multimetallic nanopatterns with peroxidase-like activities. We find that strong coordination between metal elements and DNA bases enables the accumulation of metal ions on protruding clustered DNA (pcDNA) that are prescribed on DNA origami. As a result of the condensation of pcDNA, these sites can serve as nucleation site for metal plating. We have synthesized multimetallic nanopatterns composed of up to five metal elements (Co, Pd, Pt, Ag and Ni), and obtained insights on elemental uniformity control at the nanoscale. This method provides an alternative pathway to construct a library of multimetallic nanopatterns.

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Nanoimprint Lithography‐Directed Self‐Assembly of Bimetallic Iron–M (M=Palladium, Platinum) Complexes for Magnetic Patterning

Cited by 24 publications

References 48 publications

Asymmetric Tris-Heteroleptic Cyclometalated Phosphorescent Iridium(III) Complexes: An Emerging Class of Metallophosphors

Asymmetric Tris-Heteroleptic Cyclometalated Phosphorescent Iridium(III) Complexes: An Emerging Class of Metallophosphors

Metal-containing organic compounds for memory and data storage applications

High-entropy alloy nanopatterns by prescribed metallization of DNA origami templates

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