Nitrite complexes of the rare earth elements

Pouessel, Jacky; Thuéry, Pierre; Berthet, Jean‐Claude; Cantat, Thibault

doi:10.1039/c3dt52703d

Cited by 8 publications

(2 citation statements)

References 30 publications

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“…The Nd–C carbene bond length of 2.686 Å falls in the range published in the literature. ,, The C carbene –Nd–C carbene bond angle is 91.05°, and the two NHC ligands are bent to half a circle as a force of the coordination of two oxygens to lithium. The Nd–O bond lengths are around 2.28 Å, which falls in the range published in the literature . The Li–O(Ar) bond lengths are around 2.23–2.24 Å, longer than that reported (Li–O 1.93 Å), and the Li–O(THF) bond length is 1.88 Å.…”

Section: Results and Discussionsupporting

confidence: 55%

Synthesis of Bimetallic Bis(phenolate) N-Heterocyclic Carbene Lanthanide Complexes and Their Applications in the Ring-Opening Polymerization of l-Lactide

Zhang

Shen

2014

Organometallics

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The bis(phenolate) N-heterocyclic carbene (NHC) lanthanide complexes [Ln(L) 2 M] (L = 1,3-bis[O-4,6-di-tBu-C 6 H 2 -2-CH 2 ][C(NCH 2 CH 2 N)], M = Li, Ln = Nd (1a); M = K, Ln= Nd (2a), Sm (2b), La (2c), Y (2d)) were synthesized by the reaction of L with KN(SiMe 3 ) 2 and Nd[N(SiMe 3 ) 2 ] 3 -μ-Cl-Li(THF) 3 or Ln[N(SiMe 3 ) 2 ] 3 (Ln = Nd, Sm, La, Y). The imidazolinium-bridged bis(phenolate) lanthanide complexes [Ln 2 (L3) 3 Cl 3 ] (L3 = 1,3-bis[O-4,6-di-tBu-C 6 H 2 -2-CH 2 ][CH(NCH 2 CH 2 N)] + Cl − , Ln = Sm (3a), Dy (3b), Er (3c)) were synthesized by the amine elimination reaction of L3 with Ln[N(SiMe 3 ) 2 ] 3 or Ln[N(SiMe 3 ) 2 ] 3 -μ-Cl-Li(THF) 3 . All complexes were characterized by elemental analysis. Complex 1a, 2a,c, and 3a−c were characterized by X-ray crystallography, and complexes 2c,d were characterized by 1 H and 13 C NMR spectroscopy. The NHC complexes were efficient initiators for the ringopening polymerization (ROP) of L-lactide (L-LA), with 2a giving the best catalytic activity. Imidazolinium-bridged lanthanide complexes 3a−c were inert in the ROP of L-LA. The influences of ligand structural factors and the cooperative effects between metals and the reaction medium on the catalytic activity were discussed for the ROP of L-LA. ■ INTRODUCTIONN-heterocyclic carbene transition-metal complexes have exhibited remarkable success in areas such as metathesis and coupling reactions 1 and have showed enhanced catalytic activity in comparison to the phosphine analogues. The number of reviews on NHC lanthanides is far less than that for the transition-metal counterparts. 2 Recently, lanthanide complexes bearing an NHC ligand have attracted research interest, 3 and their catalytic uses are being described with increasing frequency. Pioneering work was carried out by Arduengo et al. in 1994, who synthesized the first NHC lanthanide complexes, 4 but most of the work has come out in the past decade. 5 Chelate NHCs with a pendent anionic functionalized group have undergone an upsurge of interest due to the ease of tuning their steric and electronic properties and the possibility of a reduced tendency for ligand dissociation, 6 which means stronger metal−NHC binding by chelating effects. Complexes supported by this class of NHCs show a constrained geometry. Moreover, lanthanide complexes bearing alkali metals are popular in lanthanide chemistry, since there is a cooperative effect between lanthanide and alkali metals, and they have potential in the area of homogeneous catalysis. 7 Most of the NHC ligands used have been five-membered functionalized imidazolylidenes due to the easy access of their precursors (imidazolium salts). Comparatively, functionalized imidazolidinylidene (the backbone of NHC is saturated) ligands, 8 which are common ligands for transition-metal complexes, are rarely seen used in lanthanide chemistry. Dagorne 6c,9 and Zi 10 etc. have reported the applications of bis(phenolate) NHC transition-metal complexes in the ROP of cyclic monomers; to the best of our knowledge, no bis-(phenolate) NHC...

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Section: Results and Discussionsupporting

confidence: 55%

Synthesis of Bimetallic Bis(phenolate) N-Heterocyclic Carbene Lanthanide Complexes and Their Applications in the Ring-Opening Polymerization of l-Lactide

Zhang

Shen

2014

Organometallics

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“…Owing to the substitutional disorder, atoms O8, O9, O13, and O19 were attributed to both The in situ generation of nitrite from nitrate can be assumed under the highly acidic solvo-/hydrothermal conditions (Figure S5). 27,44 The other partially occupied di-nitro-BPDC 2− exhibits similar substitutional disorder but with water molecules, leading to the possibility for atoms O10, O25, O28, and O34 to be from both carboxyl groups, i.e. O25−C28−O28 and O10−C41−O34, and four independent water molecules.…”

Section: Resultsmentioning

confidence: 99%

Gas Adsorption, Proton Conductivity, and Sensing Potential of a Nanoporous Gadolinium Coordination Framework

et al. 2020

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The new nanoporous framework [Gd 4 (di-nitro-BPDC) 4 (NO 2 ) 3 (OH)(H 2 O) 5 ]•(solvent) (I; di-nitro-BPDC 2− = 2,2′-dinitrobiphenyl-4,4′-dicarboxylate) has been designed and synthesized through a simple one-pot reaction. In addition to its exceptional thermal and water stabilities, I exhibited multifunctional properties. A sudden CO 2 uptake to a maximum of 4.51 mmol g −1 (195 K and 1 bar) with notable selectivity over O 2 and N 2 (CO 2 /O 2 = 39 at 195 K and 0.10 bar, CO 2 /N 2 = 46 at 195 K and 0.10 bar) and an isosteric adsorption enthalpy of 20.7(4) kJ mol −1 have been revealed. Depending on the temperature and humidity, I also showed distinguished superprotonic conductivities with a maximum value and activation energy of 6.17 × 10 −2 S cm −1 (55 °C, 99 RH%, and 1 V AC voltage) and 0.43 eV, respectively. With respect to the linear dependence of conductivities on both temperature (25−55 °C at 99 RH%) and humidity (55−99 RH% at 25 °C), the potential of I in temperature and humidity sensing was evaluated, disclosing an excellent sensing resolution and exceptional accuracy, precision, and repeatability for the measurements.

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Preparation of ceria nanoparticles by thermal decomposition of a new two dimensional Ce(III) coordination polymer

Geranmayeh

Mohammadnezhad

Abbasi

2015

J Inorg Organomet Polym

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Nitrite complexes of the rare earth elements

Cited by 8 publications

References 30 publications

Synthesis of Bimetallic Bis(phenolate) N-Heterocyclic Carbene Lanthanide Complexes and Their Applications in the Ring-Opening Polymerization of l-Lactide

Synthesis of Bimetallic Bis(phenolate) N-Heterocyclic Carbene Lanthanide Complexes and Their Applications in the Ring-Opening Polymerization of l-Lactide

Gas Adsorption, Proton Conductivity, and Sensing Potential of a Nanoporous Gadolinium Coordination Framework

Preparation of ceria nanoparticles by thermal decomposition of a new two dimensional Ce(III) coordination polymer

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