6.14: The Chelate Effect - Chemistry LibreTexts
2023年11月30日 · When a bidentate ligand such as ethylenediamine binds to a metal such as Ni 2+, a five-membered ring is formed. A metal-containing ring like that shown is called a chelate ring . Correspondingly, a polydentate ligand is a chelating agent, and complexes that contain polydentate ligands are called chelate complexes.
Six-Membered Ring Chelate Complexes of Ru(II): Structural and ...
2007年11月2日 · Structural and photophysical effects of five- and six-membered chelate rings in Ru(II)−polypyridyl complexes were studied. For bis-tridentate complexes, the introduction of a six-membered chelate ring results in a room-temperature excited-state lifetime of 810 ns, which is much longer than that of five-membered chelate ring complexes with ...
Stability of Metal Complexes and Chelation - Chemistry LibreTexts
2023年6月30日 · The stability of a chelate complex depends on the size of the chelate rings. For ligands with a flexible organic backbone like ethylenediamine, complexes that contain five-membered chelate rings, which have almost no strain, are significantly more stable than complexes with six-membered chelate rings, which are in turn much more stable than ...
10.3: Isomerism - Chemistry LibreTexts
2020年9月16日 · The larger preferred bond angles in tetrahedral and trigonal bipyramidal systems often require the formation of larger six or seven-membered chelate rings for maximum stability. The size of the chelate ring actually formed between a metal and ligand is determined by the ligand's structure.
Brightly Luminescent Platinum Complexes of N∧C–∧N Ligands Forming Six ...
2021年11月3日 · Compared with N ∧ N ∧ N-ligated Pt(II) complexes that form 5-membered chelates, these compounds all contain 6-membered rings. Expanding the chelate ring size from 5 to 6 has been previously demonstrated to enhance emission in some N ∧ N ∧ N-coordinated Pt(II) species─for example, in complexes of 2,6-di(8-quinolinyl)pyridine vs those ...
Chelating properties of EDTA-type ligands containing six-membered ...
2017年3月9日 · The six-membered backbone 1,3-propanediamine ring has a half-chair conformation while in- and out of plane (G) acetate rings have twisted conformations. The trigonal-based five-membered chelate ring also adopts a twisted form.
Chelate rings of different sizes with non-innocent ligands
2019年5月7日 · The different steric and electronic conditions in six-membered chelate ring systems derived from the β-diketonate structure will be discussed with examples of substituted and π extended ligands, including 9-oxidophenalenyl, formazanate, and anions derived from indigo or 9,10-anthraquinone.
Complexes with six-membered chelate rings. II. Proton magnetic ...
Some NMR studies on six-membered chelate rings in fluorocarbon-bridged ditertiary arsine metal carbonyl complexes. Journal of Fluorine Chemistry 1974 , 3 (3-4) , 341-350.
The Stereochemistry of Five- and Six-Membered Chelate Rings
The Stereochemistry of Five- and Six-Membered Chelate Rings— Stereochemical Analysis of a Macrocyclic Complex Containing Six Asymmetric Centers. In: Kirschner, S. (eds) Coordination Chemistry. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-6555-4_1
Six-membered ring chelate complexes of Ru(II): structural and ...
2007年11月26日 · The photophysical effect of introducing a six-membered chelate ring is most pronounced for the tridentate complex, leading to a room-temperature excited-state lifetime of 810 ns, a substantial increase from 180 ns for the five-membered chelate ring model complex.