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Denticity
About: Denticity is a research topic. Over the lifetime, 17851 publications have been published within this topic receiving 309492 citations.
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TL;DR: In this paper, the synthesis of the Schiff base ligands, 4-[(4-bromo-phenylimino)-methyl]-benzene-1,2,3-triol (A1), 4]-(3,5-di-tert-butyl-4-hydroxy-phenymalin)-methyl]benzenes- 1,2-diol (A5), and their Cd(II) and Cu(II)-metal complexes, stability constants and potentiometric studies.
382 citations
TL;DR: In this article, the effect of deprotonation and coordination on the dimensions of parent heterocyclic thiones, especially those of pyridine-2-thione and benzo-1,3-thiazoline-2.
379 citations
TL;DR: The homogeneous enantioselective hydrogenation of functionalized prochiral olefins is one of the most frequently studied and most efficient transition metal-catalyzed reactions as mentioned in this paper.
Abstract: The homogeneous enantioselective hydrogenation of functionalized prochiral olefins is one of the most frequently studied and most efficient transition metal-catalyzed reactions. In the first reports using chiral Wilkinson type catalysts, low enantiomeric excesses (ee’s) were obtained using monodentate phosphines as ligands. All attempts to develop monodentate ligands which would afford high ee’s in this reaction met with limited success, the best result being reached with CAMP, already published in 1972, giving ee’s up to 90% in the hydrogenation of dehydroamino acids. Although new monodentate phosphorus ligands play a significant role in other transition metal-catalyzed reactions, highly enantioselective hydrogenations are exclusively based on bidentate phosphorus ligands. Starting with Kagan’s diop a large number of bidentate ligands with excellent selectivities was designed. Among the most successful are DIPAMP, which gives superior results compared to its monodentate analogue PAMP, the frequently used BINAP ligand, the ferrocenyl-based ligands and the DuPHOS, BPE, and FerroTANE ligands, the latter showing extremely high enantioselectivities and broad scope. To date, not only phosphines (phosphanes) are used but also bidentate aminophosphines, phosphites, phosphinites, phosphonites, and hybrid ligands such as phosphine-phosphite, aminophosphine-phosphinite, and phosphine-phosphonite,
366 citations
Patent•
18 Aug 2004
TL;DR: In this paper, the use of transition metal complexes of formula (I) in organic light-emitting diodes has been discussed, with the condition that n is at least 1.
Abstract: The invention relates to the use of transition metal complexes of formula (I) in organic light-emitting diodes, wherein: M1 represents a metal atom; carbene represents a carbene ligand; L represents a monoanionic or dianionic ligand; K represents a neutral monodentate or bidentate ligand selected from the group consisting of phosphines, CO, pyridines, nitriles and of conjugated dienes that form a π-complex with M1; n represents a number of carbene ligands, whereby n is at least 1; m represents a number of ligands L, whereby m can be 0 or = 1; o represents a number of ligands K, whereby o can be 0 or = 1, and the sum n + m + o depends on the oxidation stage and coordination number of the metal atom used and on the dentation of the ligands carbene, L and K as well as on the charge of the ligands carbene and L, with the condition that n is at least 1. The invention also relates to an OLED containing these transition metal complexes, a light-emitting layer containing these transition metal complexes, OLED's containing this light-emitting layer, devices that contain an inventive OLED, and to special transition metal complexes containing at least two carbene ligands.
365 citations
TL;DR: It appears that functionalization of biomolecules with tridentate-chelating ligand systems is preferable for the labeling with fac-[(99m)Tc(OH(2)(3)(CO)(3)](+), since this will presumably result in radioactive bioconjugates with better pharmacokinetic profiles.
362 citations