- Phosphorescent Cyclometalated Platinum(II) Imidazolinylidene Complexes
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We present the synthesis and characterization of six novel bidentate (Formula presented.) cyclometalated platinum(ii) complexes derived from saturated N-heterocyclic carbene precursors, namely 1-aryl-3-methyl-1H-4,5-dihydroimidazolium salts. The title compounds were then synthesized by a multi-step reaction, which includes an in situ generation of the silver carbene complex, followed by transmetalation to platinum and subsequent introduction of the β-diketonate ligand. Structural characterization by NMR experiments and solid-state structures prove the cyclometalation and the saturated backbone of the NHC motif. Photophysical and electrochemical properties of the platinum(ii) complexes were examined and studied in detail by DFT calculations. The title compounds are strongly emissive at room temperature in the sky-blue region of the visible spectrum and show quantum yields of up to 71 % in a PMMA matrix.
- Stipurin, Sergej,Strassner, Thomas
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p. 804 - 813
(2021/02/05)
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- METHOD OF CARBON MONOXIDE FIXATION AND METHOD OF AMINE FORMYLATION
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The present invention relates to a method for fixing carbon monoxide in a metal-free condition and a method for formating amine using the same.
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Paragraph 0078; 0081-0085; 0096-0098
(2021/02/19)
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- Metal-free Carbon Monoxide (CO) Capture and Utilization: Formylation of Amines
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The capture and utilization of CO by 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) were performed in the absence of transition-metal complexes. The reaction of TBD with CO afforded TBD-CO adducts, which were converted to formylated TBD (TBD-CHO). TBD-CO adducts may include an interaction of CO with positively charged species based on NMR and IR analysis. In the presence of amines, CO was transferred from TBD-CO to amines, producing formylated amines with good yields. The reaction mechanism involving TBD-CO adducts is presented based on theoretical calculations. (Figure presented.).
- Noh, Hyeong-Wan,An, Youngjoon,Lee, Seulchan,Jung, Jaehoon,Son, Seung Uk,Jang, Hye-Young
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- Synthesis and study of 1-aryl-1H-4,5-dihydroimidazoles
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An easy synthesis of 1-aryl-1H-4,5-dihydroimidazoles 1 by cyclocondensation of N-aryl-N′-formylethylenediamines 2 is described. Such precursors were synthesized by selective formylation of N-arylethylenediamines 3 with p-nitrophenyl formate. Cyclizations were performed using trimethylsilyl polyphosphate. Chemical properties of compounds 1, typical of amidine system, were studied. Reaction of 1 with methyl iodide leads to the corresponding 1-aryl-3-methyl-1H-4,5-dihydroimidazolium salts 5. Reduction of dihydroimidazoles 1 with sodium cyanoborohydride provides a convenient access to N-aryl-N′-methylethylenediamines 4.
- Perillo, Isabel,Caterina, M. Cristina,Lopez, Julieta,Salerno, Alejandra
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p. 851 - 856
(2007/10/03)
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- 5-Lipoxygenase inhibitors: Synthesis and structure-activity relationships of a series of 1-aryl-2H,4H-tetrahydro-1,2,4-triazin-3-ones
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Synthetic routes were developed to access a variety of novel 1-aryl- 2H,4H-tetrahydro-1,2,4-triazin-3-one analogs which were evaluated as 5- lipoxygenase (5-LO) inhibitors. The parent structure, 1-phenylperhydro- 1,2,4-triazin-3-one (4), was found to be a
- Bhatia, Pramila A.,Brooks, Clint D. W.,Basha, Anwer,Ratajczyk, James D.,Gunn, Bruce P.,Bouska, Jennifer B.,Lanni, Carmine,Young, Patrick R.,Bell, Randy L.,Carter, George W.
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p. 3938 - 3950
(2007/10/03)
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