scholarly journals Highly luminescent lanthanide complexes sensitised by tertiary amide-linked carbostyril antennae

2018 ◽  
Vol 47 (31) ◽  
pp. 10702-10714 ◽  
Author(s):  
Daniel Kovacs ◽  
Dulcie Phipps ◽  
Andreas Orthaber ◽  
K. Eszter Borbas
Keyword(s):  
Lanthanide Complexes ◽  
Quantum Yields ◽  
Secondary Amide ◽  
Tertiary Amide

The replacement of the secondary amide linker that carries the sensitizing carbostyril antenna with a tertiary amide in luminescent Eu and Tb complexes dramatically increases the lanthanide emission quantum yields.

scholarly journals Selective Extraction of Platinum(IV) from the Simulated Secondary Resources Using Simple Secondary Amide and Urea Extractants

Separations ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 139
Author(s):  
Yuki Ueda ◽  
Shintaro Morisada ◽  
Hidetaka Kawakita ◽  
Keisuke Ohto
Keyword(s):  
Electrical Equipment ◽  
Selective Extraction ◽  
Extraction Process ◽  
Secondary Amide ◽  
Separation And Purification ◽  
Secondary Resources ◽  
Tertiary Amide ◽  
Third Phase ◽  
Simulated Effluent ◽  
Secondary Amides

The recycling of rare metals such as platinum (Pt) from secondary resources, such as waste electronic and electrical equipment and automotive catalysts, is an urgent global issue. In this study, simple secondary amides and urea, N-(2-ethylhexyl)acetamide, N-(2-ethylhexyl)octanamide, and 1-butyl-3-(2-ethylhexyl)urea, which selectively extract Pt(IV) from a simulated effluent containing numerous metal ions, such as in an actual hydrometallurgical process, were synthesized and achieved efficient Pt(IV) stripping using only water. Comparison of Pt(IV) extraction behavior with a tertiary amide without N–H moieties suggests that the secondary amides and urea extractants effectively use hydrogen bonding to the hexachloroplatinate anion by N–H moieties. Examining the conditions for the third phase formation revealed that the secondary amide extractant with the longest alkyl chain can be used in the extraction process for a long time without forming any third phase, despite its lower Pt(IV) extraction capacity. The practical trial with simple compounds developed in this study should contribute to the development of Pt separation and purification processes.

scholarly journals The ozonolysis of primary aliphatic amines in fine particles

2008 ◽  
Vol 8 (5) ◽  
pp. 1181-1194 ◽  
Author(s):  
J. Zahardis ◽  
S. Geddes ◽  
G. A. Petrucci
Keyword(s):  
Fine Particles ◽  
Reaction System ◽  
Tropospheric Chemistry ◽  
Ozone Exposure ◽  
Surface Barrier ◽  
Secondary Amide ◽  
Tertiary Amide ◽  
Aerosol Mass ◽  
Criegee Intermediates ◽  
Species Specific

Abstract. The oxidative processing by ozone of the particulate amines octadecylamine (ODA) and hexadecylamine (HDA) is reported. Ozonolysis of these amines resulted in strong NO2– and NO3– ion signals that increased with ozone exposure as monitored by photoelectron resonance capture ionization aerosol mass spectrometry. These products suggest a mechanism of progressive oxidation of the particulate amines to nitroalkanes. Additionally, a strong ion signal at 125 m/z is assigned to the ion NO3– (HNO3). For ozonized mixed particles containing ODA or HDA + oleic acid (OL), with pO3≥3×10–7 atm, imine, secondary amide, and tertiary amide products were measured. These products most likely arise from reactions of amines with aldehydes (for imines) and stabilized Criegee intermediates (SCI) or secondary ozonides (for amides) from the fatty acid. The routes to amides via SCI and/or secondary ozonides were shown to be more important than comparable amide forming reactions between amines and organic acids, using azelaic acid as a test compound. Finally, direct evidence is provided for the formation of a surface barrier in the ODA + OL reaction system that resulted in the retention of OL at high ozone exposures (up to 10−3 atm for 17 s). This effect was not observed in HDA + OL or single component OL particles, suggesting that it may be a species-specific surfactant effect from an in situ generated amide or imine. Implications to tropospheric chemistry, including particle bound amines as sources of oxidized gas phase nitrogen species (e.g.~NO2, NO3), formation of nitrogen enriched HULIS via ozonolysis of amines and source apportionment are discussed.

Hydride Reductions of 1H-Pyrrolo[2,1-c][1,4]-benzodiazepine-5,11-diones: Selective Reduction of Secondary Amides to Carbinolamines

1998 ◽  
Vol 51 (12) ◽  
pp. 1121 ◽  
Author(s):  
Andrew G. Katsifis ◽  
Meredith E. McPhee ◽  
Damon D. Ridley
Keyword(s):  
Selective Reduction ◽  
Secondary Amide ◽  
Tertiary Amide ◽  
Secondary Amides

For the syntheses of radiolabelled pyrrolo[1,4]benzodiazepine antitumour antibiotics we required a method in which the unstable carbinolamine functionality was introduced prior to the radiolabel. In turn this required the selective reduction of a secondary amide in the presence of, inter alia, a tertiary amide. We report methods which can be used to achieve this outcome in a series of 1H-pyrrolo[2,1-c][1,4]benzodiazepine-5,11-diones.

Enhanced Luminescence of Terbium Complexes with 2,3-Pyrazinedicarboxylate by Y(III) Doping

2013 ◽  
Vol 750-752 ◽  
pp. 1007-1010
Author(s):  
Ai Ling Wang ◽  
Hai Xia Zhang ◽  
Kai Kong ◽  
Huan Huan Li ◽  
Hua Wang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Lanthanide Complexes ◽  
The Self ◽  
Lanthanide Ions ◽  
Quantum Yields ◽  
Luminescence Spectra ◽  
Intramolecular Energy Transfer ◽  
Enhanced Luminescence ◽  
Yttrium Complexes ◽  
Terbium Complexes

Ten kinds of terbium doped inert yttrium complexes with 2,3-pyrazinedicarboxylate (2,3-pzdc2-) have been synthesized. Characterization results indicate that the complexes have the compositions of Tb (pzdc)1.55H2O and TbxYy(pzdc)1.55H2O (x:y=0.10:0.90; 0.20:0.80; 0.30:0.70; 0.40:0.60; 0.60:0.40; 0.70:0.30; 0.80:0.20; 0.90:0.10). IR spectra show that the lanthanide ions coordinate with the carboxylic oxygen atoms and nitrogen atoms of the ligands. Luminescence spectra show that the Y(III) ions can remarkably increase the luminescent intensities of terbium complexes. And Tb0.7Y0.3(pzdc)1.55H2O exhibits the strongest luminescent emission. Furthermore, the doped lanthanide complexes show longer luminescence lifetimes and higher quantum yields. The enhanced luminescence efficiencies of Tb3+ions in the doped complexes may result from intramolecular energy transfer as well as the decrease of the self-quench of the Tb3+ions induced by the doped Y(III) ions.

Toward accurate measurement of the intrinsic quantum yield of lanthanide complexes with back energy transfer

2020 ◽  
Vol 22 (6) ◽  
pp. 3683-3690
Author(s):  
Shun Omagari ◽  
Martin Vacha
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Lanthanide Complexes ◽  
Quantum Yields ◽  
Back Energy Transfer

This work theoretically shows that the intrinsic quantum yields are different between ligand excitation and direct lanthanide excitation in the presence of back energy transfer.

Luminescence, Non-Radiative Processes and Quantum Yields in Lanthanide Complexes

1999 ◽  
Vol 315-317 ◽  
pp. 204-210 ◽  
Author(s):  
C. de Mello Donegá ◽  
S. Alves ◽  
O.L. Malta ◽  
G.F. de Sá
Keyword(s):  
Lanthanide Complexes ◽  
Quantum Yields ◽  
Radiative Processes

Synthesis and Properties of Novel Asymmetrical Porphyrin with [p-(4-Flourobenzoyloxy)-M-Ethyloxy]phenyl and its Lanthanide Complexes

2011 ◽  
Vol 308-310 ◽  
pp. 643-646
Author(s):  
Xiao Ling Cui ◽  
Xin Ming Shi ◽  
Shi You Li
Keyword(s):  
Lanthanide Complexes ◽  
Room Temperature ◽  
Molar Conductance ◽  
Bidentate Ligand ◽  
Quantum Yields ◽  
Luminescence Spectra ◽  
Tetradentate Ligand ◽  
Rare Earth Ion ◽  
Elemental Analyses ◽  
Band Fluorescence

A series of lanthanide complexes with acetylacetonate and a new asymmetrical 5-[p-(4-fluorobenzoyloxy)-m-ethyloxy]phenyl-10,15,20-triphenylporphyrin were prepared and characterized by elemental analyses, molar conductance, UV-Vis, IR, 1H NMR, luminescence spectra and themal analysis. Quantum yields of Q band fluorescence are in the region 0.073-0.097 at room temperature. Complexes have higher stability (decompose until 211°C). The structure that both the porphyrin behaved as a tetradentate ligand and acetylacetonate as a bidentate ligand are coordinated to a rare earth ion also has been proposed.

scholarly journals Reverse Polarity Reductive Functionalization of Tertiary Amides via a Dual Iridium Catalyzed Hydrosilylation & SET Strategy

2020 ◽  
Author(s):  
Tatiana Rogova ◽  
Pablo Gabriel ◽  
Stamatia Zavitsanou ◽  
Jamie Leitch ◽  
Fernanda Duarte ◽  
...  
Keyword(s):  
Active Pharmaceutical Ingredient ◽  
Building Blocks ◽  
Chemical System ◽  
Secondary Amide ◽  
Reductive Activation ◽  
Tertiary Amide ◽  
New Strategy ◽  
Tandem Process ◽  
Electron Reduction ◽  
Tertiary Amides

A new strategy for the mild generation of synthetically valuable α-amino radicals from robust tertiary amide building blocks has been developed. By combining Vaska’s complex-catalyzed tertiary amide reductive activation and photochemical single electron reduction into a streamlined tandem process, metastable hemiaminal intermediates were successfully transformed into nucleophilic α-amino free radical species. This umpolung approach to such reactive intermediates was exemplified through coupling with an electrophilic dehydroalanine acceptor, resulting in the synthesis of an array of α-functionalized tertiary amine derivatives, previously inaccessible from the amide starting materials. The utility of the strategy was expanded to include secondary amide substrates, intramolecular variants and late stage functionalization of an active pharmaceutical ingredient. DFT analyses were used to establish the reaction mechanism and elements of the chemical system that were responsible for the reaction’s efficiency.

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