Reactivity of an Arene Cobalt Triple Decker Complex Towards Various Ligands. Facile Arene Displacement in [Bis{( η5-pentamethylcyclopentadienyl)cobalt}-μ-{η4: η4-toluene}]

1995 ◽  
Vol 50 (7) ◽  
pp. 1055-1060 ◽  
Author(s):  
Jörg J. Schneider
Keyword(s):  
Room Temperature ◽  
Elemental Sulfur ◽  
Organic Ligands ◽  
Dinuclear Complexes ◽  
Sulfide Cluster

The triple decker complex [{(η5-Cp*)Co}2-μ-{η4: η4-toluene}] 1b exhibits an unusual reactivity towards a variety of organic ligands, 1b reacts with CO, ethene, butadiene, H2, Al2O3, hexafluorobenzene, 1.5 Cod, 2-butyne, phenanthrene, naphthalene and the dinuclear Ni cluster [{(η5-Cp)NiP(C2H5)3}2] to form mainly mononuclear organocobalt complexes. Reaction of 1b with NO and the diazoalkanes di-t-butyl-diazomethane and 2-diazo-1,1′,3,3′-tetramethylcyclohexane results in the formation of the dinuclear complexes [{(η5-Cp*)CoNO}2], [{(η5-Cp*)(di-t-butyl-diazomethane)Co}2] and [{(η5-Cp*)(2-diazo-1,1′,3,3′-tetramethylcyclohexane) Co}2], respectively. In the reaction of 1b with elemental sulfur the formation of a tetranuclear Co-sulfide cluster is observed. In the majority of the reactions studied, l b looses its toluene ligand already at room temperature indicating an unusual high and hitherto unprecedented reactivity of an arene triple decker complex.

scholarly journals Synthesis of Organic Ligands via Reactions of 4-Benzoyl-5-phenylamino-2,3-dihydrothiophene-2,3-dione with N-Nucleophiles

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Hassan Kabirifard ◽  
Pardis Hafez Taghva ◽  
Hossein Teimouri ◽  
Niloofar Koosheshi ◽  
Parastoo Javadpour ◽  
...  
Keyword(s):  
High Temperature ◽  
Carbonyl Group ◽  
Aromatic Amines ◽  
Room Temperature ◽  
Organic Ligands ◽  
Carboxyl Group ◽  
Primary Aromatic Amines

The reaction of 4-benzoyl-5-phenylamino-2,3-dihydrothiophene-2,3-dione (1) with aminoheteroaryls, lamotrigine, 1,3-diaminoheteroaryls, dapsone, NH2R (hydroxylamine, DL-1-phenylethylamine, and metformin), and 4,4′-bipyridine in THF/H2O (1 : 1) at room temperature led to 3-N-phenylthiocarbamoyl-2-butenamides 2–5, while that with naphthylamines and 1,3-phenylenediamine in ethanol at high temperature led to 5-phenylamino-2,5-dihydrothiophene-2-ones 6–8 as organic ligands in the medium to good yields. These showed the nucleophilic attacks of N-nucleophiles, except primary aromatic amines, on thioester carboxyl group (C-2) of thiophene-2,3-dione ring 1. However, the nucleophilic attacks of primary aromatic amines on the carbonyl group (C-3) of thiophene-2,3-dione 1 occurred in the form of substituted thiophenes.

scholarly journals The synthesis of highly active carbon dot-coated gold nanoparticles via the room-temperature in situ carbonization of organic ligands for 4-nitrophenol reduction

RSC Advances ◽  
2020 ◽  
Vol 10 (33) ◽  
pp. 19419-19424
Author(s):  
Yue Zhu ◽  
Juan Du ◽  
Qianqian Peng ◽  
Fengyi Wang ◽  
Jing Hu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Active Carbon ◽  
Room Temperature ◽  
Organic Ligands ◽  
Carbon Dot ◽  
Highly Active ◽  
Nitrophenol Reduction ◽  
In Situ Carbonization

Due to the serious pollution issue caused by 4-nitrophenol (4-NP), it is of great importance to design effective catalysts for its reduction.

Facile room temperature synthesis of metal–organic frameworks from newly synthesized copper/zinc hydroxide and their application in adsorptive desulfurization

RSC Advances ◽  
2016 ◽  
Vol 6 (44) ◽  
pp. 37530-37534 ◽  
Author(s):  
Wencong Xu ◽  
Gang Li ◽  
Weigang Li ◽  
Haojie Zhang
Keyword(s):  
Room Temperature ◽  
Metal Organic Frameworks ◽  
Organic Ligands ◽  
Zinc Hydroxide ◽  
Facile Synthesis ◽  
Adsorptive Desulfurization ◽  
Temperature Synthesis ◽  
Room Temperature Synthesis ◽  
Metal Organic ◽  
Copper Zinc

Facile synthesis of metal–organic frameworks was demonstrated via directly adding organic ligands solution into the newly synthesized copper/zinc hydroxide solution.

Passivation of Si(100)2×l Surfaces With Elemental Sulfur

1995 ◽  
Vol 410 ◽  
Author(s):  
Aris Papageorgopoulos
Keyword(s):  
Work Function ◽  
Room Temperature ◽  
Elemental Sulfur ◽  
Sticking Coefficient ◽  
Temperature Changes

ABSTRACTDeposition of elemental S on Si(100)2×1 surfaces at room temperature changes the reconstructed Si(100)2×1 to its original bulk-terminated Si(100)l×l surface. Sulfur forms initially a (2×l) on the Si(100)2×l surface and subsequently a (l×1) on the Si(100)l×l. Above 1ML, sulfur is diffused into the Si bulk near the surface. The sticking coefficient of S on Si(100) surface is constant up to 2 ML. Deposition of S at RT up to 1 ML increases the work function of the surface by about.3±0.05 eV. Above I ML, as the S is diffused into the Si bulk, the work function decreases.

Plasma Synthesis and Surface Passivation of Silicon Quantum Dots with Photoluminescence Quantum Yields higher than 60%

2006 ◽  
Vol 934 ◽  
Author(s):  
Lorenzo Mangolini ◽  
David Jurbergs ◽  
Elena Rogojina ◽  
Uwe Kortshagen
Keyword(s):  
Quantum Dots ◽  
Silicon Nanocrystals ◽  
Room Temperature ◽  
Surface Passivation ◽  
Organic Ligands ◽  
Quantum Yields ◽  
Plasma Synthesis ◽  
Silicon Quantum Dots ◽  
Chemical Surface ◽  
Wet Chemical

ABSTRACTSilicon nanocrystals with diameters of less than 5 nm show efficient room temperature pho-toluminescence (PL). Previous reports of PL quantum yields for ensembles of silicon quantum dots have usually been in the few percent range, and generally less than 30%. Here we report the plasma synthesis of silicon quantum dots and their subsequent wet-chemical surface passivation with organic ligands while strictly excluding oxygen. Photoluminescence quantum yields as high as 62% have been achieved at peak wavelengths of about 789 nm.

Cyanato - Kupfer (II) - Komplexe mit organischen Liganden, XX [1]. ESR- und magnetische Untersuchung des Dicyanato-bis(pyridin)kupfer(II)-Komplexes / Cyanato-Copper(II) Complexes with Organic Ligands, XX [1]. ESR and Magnetic Study of Dicyanato-bis(pyridine)copper(II)

1982 ◽  
Vol 37 (1) ◽  
pp. 102-104 ◽  
Author(s):  
Jiří Kohout ◽  
Jerzy Mroziński ◽  
Mária Hvastijová
Keyword(s):  
Molecular Structure ◽  
Magnetic Susceptibility ◽  
Temperature Dependence ◽  
Room Temperature ◽  
Crystal And Molecular Structure ◽  
Esr Spectra ◽  
Organic Ligands ◽  
Magnetic Study ◽  
Esr Spectrum ◽  
Reversed Line

Abstract The ESR spectra and the temperature dependence of the magnetic susceptibility of Cu(NCO)2(pyridine)2 were measured. The ESR spectrum at room temperature shows a single reversed line; at -130 °C it is isotropic. The susceptibility down to 4.2 K obeys the Curie-Weiss law with a small θ value. These results are interpreted on the basis of the known crystal and molecular structure.

Syntheses and structures of three macrocyclic supramolecular complexes and one ZnII-containing coordination polymer generated from a semi-rigid multidentate N-containing ligand

2021 ◽  
Vol 77 (1) ◽  
pp. 29-39
Author(s):  
Xiang-Long Niu ◽  
Lin Wei ◽  
Jian-Cheng Liu ◽  
Wan-He Jia ◽  
Jian-Ping Ma ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Room Temperature ◽  
Mixed Solvent ◽  
Weak Interactions ◽  
Three Dimensional ◽  
Organic Ligand ◽  
Solvent System ◽  
Organic Ligands ◽  
Mixed Solvent System ◽  
Solution Reaction

Semirigid organic ligands can adopt different conformations to construct coordination polymers with more diverse structures when compared to those constructed from rigid ligands. A new asymmetric semirigid organic ligand, 4-{2-[(pyridin-3-yl)methyl]-2H-tetrazol-5-yl}pyridine (L), has been prepared and used to synthesize three bimetallic macrocyclic complexes and one coordination polymer, namely, bis(μ-4-{2-[(pyridin-3-yl)methyl]-2H-tetrazol-5-yl}pyridine)bis[dichloridozinc(II)] dichloromethane disolvate, [Zn2Cl4(C12H10N6)2]·2CH2Cl2, (I), the analogous chloroform monosolvate, [Zn2Cl4(C12H10N6)2]·CHCl3, (II), bis(μ-4-{2-[(pyridin-3-yl)methyl]-2H-tetrazol-5-yl}pyridine)bis[diiodidozinc(II)] dichloromethane disolvate, [Zn2I4(C12H10N6)2]·2CH2Cl2, (III), and catena-poly[[[diiodidozinc(II)]-μ-4-{2-[(pyridin-3-yl)methyl]-2H-tetrazol-5-yl}pyridine] chloroform monosolvate], {[ZnI2(C12H10N6)]·CHCl3} n , (IV), by solution reaction with ZnX 2 (X = Cl and I) in a CH2Cl2/CH3OH or CHCl3/CH3OH mixed solvent system at room temperature. Complex (I) is isomorphic with complex (III) and has a bimetallic ring possessing similar coordination environments for both of the ZnII cations. Although complex (II) also contains a bimetallic ring, the two ZnII cations have different coordination environments. Under the influence of the I− anion and guest CHCl3 molecule, complex (IV) displays a significantly different structure with respect to complexes (I)–(III). C—H...Cl and C—H...N hydrogen bonds, and π–π stacking or C—Cl...π interactions exist in complexes (I)–(IV), and these weak interactions play an important role in the three-dimensional structures of (I)–(IV) in the solid state. In addition, the fluorescence properties of L and complexes (I)–(IV) were investigated.

Coupling of Electron Transfer and Bond Dissociation Processes in Dinuclear Complexes with Rhodium and Iridium Reaction Centres Bridged by 2,2'-Bipyrimidine

2001 ◽  
Vol 66 (2) ◽  
pp. 291-306 ◽  
Author(s):  
Wolfgang Kaim ◽  
Ralf Reinhardt ◽  
Stefan Greulich ◽  
Monika Sieger ◽  
Axel Klein ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Cyclic Voltammetry ◽  
Radical Cation ◽  
Room Temperature ◽  
Dinuclear Complexes ◽  
Pure Species ◽  
Bond Dissociation ◽  
Reaction Centres ◽  
Partial Dissociation

The complexes [{MCl(η5-C5Me5)}2(μ-bpym)](PF6)2, bpym = 2,2'-bipyrimidine and M = Rh or Ir, were obtained as isomerically pure species (M = Ir) or as mixtures of cis/trans isomers (M = Rh). Even though these compounds undergo partial dissociation into the mononuclear bpym- and solvento-complexes in DMF or acetonitrile, cyclic voltammetry and, in part, spectroscopy (NMR, EPR, UV-VIS) could be used to analyze their reduction with up to five electrons. In acetonitrile at room temperature, the dirhodium compound displays two sequential chloride-dissociative two-electron cathodic steps, leading to the very reactive [{Rh(η5-C5Me5)}2(μ-bpym)]. At -15 °C in DMF, the diiridium compound was found to be sufficiently inert towards dissociation; it is then reversibly reduced to an EPR-detectable radical cation [{IrCl(η5-C5Me5)}2(μ-bpym)]•+ before two separated chloride-dissociative steps occur.

Self-Discharge Behavior of Lithium/Sulfur Battery Using Aluminum Current Collector

2005 ◽  
Vol 486-487 ◽  
pp. 630-633 ◽  
Author(s):  
Ho Suk Ryu ◽  
Hyo Jun Ahn
Keyword(s):  
Room Temperature ◽  
Elemental Sulfur ◽  
Open Circuit Voltage ◽  
Current Collector ◽  
Open Circuit ◽  
The Self ◽  
Discharge Behavior ◽  
Sulfur Battery ◽  
Sulfur Electrode ◽  
Lithium Sulfur

We investigated the self discharge behavior of lithium/sulfur cell using an alumium current collector. The discharge capacity decreased by 14% for oriniginal one after 30 days’ storage at room temperature. The open circuit voltage(OCV) of Li/S battery gradually decreased from 2.45V to 2.38V during the 30 days. The self discharge behavior was related to the decrease of elemental sulfur in the sulfur electrode.

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