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Synopsis. The net donating ability of 15 bidentate ligands including aromatic and aliphatic diimines as well as alkyl-bridged di-N-heterocyclic carbenes was determined using a 13 C NMR-based electronic parameter. Differences in the substituents and the backbones affect the donating ability of the bidentate ligands according to their inductive and mesomeric …
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During the past decades, synthetic organic chemistry discovered that directing group assisted C–H activation is a key tool for the expedient and siteselective construction of C–C bonds. Among the various directing group strategies, bidentate directing groups are now recognized as one of the most efficient devices for the selective functionalization of …
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Bidentate ligands are often called chelating ligands since they form chelates when coordinated to a metal atom or ion. Chelates are usually more stable than non-chelated complexes due to the formation of a ring with the metal. The stability of chelates increases with an increase in ring size up to six-membered rings (ring strain = 0.1 …
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Ligands with two donor groups are bidentate ligands. Ethylenediamine, H 2 NCH 2 CH 2 NH 2, and the anion of the acid glycine, NH 2 CH 2 CO 2 − NH 2 CH 2 CO 2 − (Figure 19.17) are examples of bidentate ligands. Tridentate ligands, tetradentate ligands, pentadentate ligands, and hexadentate ligands contain three, four, five, and six donor ...
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The bidentate ligands (102) crystallized in ethylacetate or acetone-ethanol under slow evaporation. The bidentate ligand (102) was reported to be selective with Ni(II) cation with a sensitivity of 2.417 µAµM cm −2 and a detection limit of 0.78 nM. Download: Download high-res image (204KB) Download: Download full-size image; Scheme 30.
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The postulated bidentate binding of catalyst and substrate by two hydrogen bonds was experimentally validated by detection of trans-hydrogen bond scalar couplings. Counterintuitively, the resulting CPA/imine complexes showed a broad potential structural space and a strong preference towards the formation of [CPA/imine] 2 dimers. Molecular ...
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Herein, four pyridine-based chelating ligands, including 1,10-phenanthroline, 4,4′-bipyridine, 4,7-diphenyl-1,10-phenanthroline (Bphen) and pyridine, are used as surface treatment agents for improving the electronic properties of perovskite materials. The results of the steady-state photoluminescence (PL), t
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Separation and recovery of rare earth elements using novel ammonium-based task-specific ionic liquids with bidentate and tridentate O-donor functional groups. M. Khodakarami L. …
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The metal ions that coordinated with the various bidentate ligands studied can be classified using Pearson's hard-soft acids and bases (HSAB) principles which is based on polarizability of an atom (Table 1) [4].Metal atoms that are non-polarizable are classified as hard acid while the highly polarizable metal atoms are referred to as soft …
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Therefore, we have synthesized a ligand 1,2-hexadecanedithiol with a bidentate form, inducing one ligand to bind to the QD surface strongly through the chelate effect, as a good way to improve the stability of the QDs; thus, the PL stability of the green-light-emitting InP-based QDs was greatly increased. To confirm the existence of the …
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In each class of bidentate ligands, one donor remained constant (neutral: pyridine, anionic: carboxylate) while being paired with a series of aromatic nitrogen donors (e.g., pyridine, imidazole, triazole) (Figure 1). These combinations permitted the overall evaluation for both the overall charge of the system as well as the type of aromatic ...
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Structures With Bidentate Ligands. Bidentate ligands are bases that donate two pairs ("bi") of electrons to a metal atom.. Bidentate ligands are often referred to as chelating ligands ("chelate" is derived from the Greek word for "claw") because they can "grab" a metal atom in two places.. A complex that contains a chelating ligand is called a …
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1. Introduction. N-heterocyclic carbenes (NHCs) are now an integral component in contemporary coordination chemistry.Since the isolation of the first stable free carbene species by Bertrand and co-workers in 1988 [1], and the first stable NHC by Arduengo and co-workers in 1991 [2], NHCs have been heavily featured in an extensive …
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This number of binding sites is called the denticity and ligands are referred to as monodentate (non- chelating), bidentate, tridentate, etc., based on the number of sites available. Ligands with two binding sites have a denticity of two and are said to be bidentate; those with three are tridentate, four tetradentate, and so on.
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One example of a type of octahedral compounds that can form enantiomers is bidentate complexes. In bidentate complexes (from the Greek two teeth) or chelating complexes (from the Greek crab), a …
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Find and fix vulnerabilities Codespaces. Instant dev environments
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It could be bidentate, meaning it binds through lone pairs on two different atoms. It could even be tridentate, with three atoms bearing their own lone pairs, tetradentate, and so on. Table CC (PageIndex{2}) Examples of polydentate ligands.
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Bidentate ligands bind through two donor sites. Bidentate means "two-toothed." An example of a bidentate ligand is ethylenediamine. It can bind to a metal via two donor atoms at once. Figure (PageIndex{1}): The hypothetical "lobster ligand" binds to the (Ni^{2+}) via two donor sites. Bidentate binding allows a ligand to bind more tightly.
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This mapping of bidentate ligand space with DFT-calculated steric and electronic parameters has demonstrated that the properties of ligands with different donor atoms can be captured within a single computational approach, providing both an overview of ligand space and scope for the more detailed investigation and comparison of different ligand ...
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Bidentate directing group (DG) strategy is a promising way to achieve sp2 and more inert sp3 C–H bond activations in transition metal (TM) catalysis. In this work, we systematically explored the assisting effects exerted by bidentate DGs in the C–H bond activations. Through DFT calculations and well-defined comparative analysis, we for the first time …
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