Heteroleptic gold complexes with 4,5-diselenolate-1,3-dithiole-2-thione (C3C3Se22-, dsit)

1998 ◽  
Vol 76 (7) ◽  
pp. 1033-1037
Author(s):  
Elena Cerrada ◽  
Mariano Laguna
Keyword(s):  
Key Words ◽  
Electrochemical Oxidation ◽  
Room Temperature ◽  
Zinc Complex ◽  
Trinuclear Complex ◽  
Gold Complexes ◽  
Electrical Conductivities ◽  
Tin Complexes ◽  
Ligand Transfer

The reaction of (NBu4)2[Zn(dsit)2] (dsit = 4,5-diselenolate-1,3-dithiole-2-thione) with AuClL in a 1:4 ratio leads to [Au2(dsit)L2] (L = PPh3 (1), PPh2Me (2)), transferring the diselenolate group. Complex 2 reacts further with equimolar amounts of [Au(OClO3)L], affording the trinuclear complex [Au3(dsit)(PPh2Me)3]ClO4 (3). When the reaction of (NBu4)2[Zn(dsit)2] with [Au2Cl2(P-P)] was carried out in a 1:2 ratio, complexes [Au2(dsit)(P-P)]n (P-P = dppe (1,2-bis(diphenylphosphine)ethane), n = 1 (4); P-P = dppm (bis(diphenylphosphine)methane), n = 2 (5)) are obtained. Anionic derivatives such as (NBu4)[Au(dsit)2] (6) could be obtained by reaction of the zinc complex with (NBu4)[AuBr4] in a 1:1 ratio while other gold complexes require a tin complex as ligand transfer. So [Sn(dsit)Me2] (7), obtained from the zinc complex and [SnCl2Me2], reacts with PPN[Au(C6F5)Cl] (PPN = bis(triphenylphosphine)iminium) or [AuBr2(S2CNR2)] affording [Au(dsit)(S2CNR2)] (R = Me (8); R = Bz (9)) or (PPN)2[Au2(dsit)(C6F5)2] (10), respectively. Electrochemical oxidation of 6 gives (NBu4)0.4[Au(dsit)2] (11) and the reaction with (TTF)3(BF4)2 (TTF = tetrathiafulvalene) affords (TTF)[Au(dsit)2] (12). Electrical conductivities of these complexes at room temperature in compacted pellets are 3 × 10-8 (11) and 5 × 10-3 (12) S cm-1.Key words: diselenolate, dsit, gold complexes, tin complexes.

Controlled Growth and Characterization Ag/ZnO Nanotetrapods for Humidity Sensing

2018 ◽  
Vol 21 (7) ◽  
pp. 462-467
Author(s):  
Babak Sadeghi
Keyword(s):  
Room Temperature ◽  
Zinc Complex ◽  
Water Solution ◽  
Particle Morphology ◽  
Quick Response ◽  
Separation System ◽  
Humidity Sensing ◽  
Sensor Material ◽  
Highly Sensitive

Aim and Objective: Ultrafine Ag/ZnO nanotetrapods (AZNTP) have been prepared successfully using silver (I)–bis (oxalato) zinc complex and 1, 3-diaminopropane (DAP) with a phase separation system, and have been injected into a diethyl/water solution. Materials and Methods: This crystal structure and lattice constant of the AZNTP obtained were investigated by means of a SEM, XRD, TEM and UV-vis spectrum. Results: The results of the present study demonstrated the growth and characterization AZNTP for humidity sensing and DAP plays a key role in the determination of particle morphology. AZNTP films with 23 nm in arm diameter have shown highly sensitive, quick response sensor material that works at room temperature.

Synthesis and aldol cyclotrimerization of 4,7-di-tert-butylacenaphthenone

2006 ◽  
Vol 84 (10) ◽  
pp. 1268-1272 ◽  
Author(s):  
Aaron W Amick ◽  
Keith S Griswold ◽  
Lawrence T Scott
Keyword(s):  
Key Words ◽  
Crystal Structures ◽  
Silica Gel ◽  
Room Temperature ◽  
Titanium Tetrachloride ◽  
X Ray ◽  
Synthetic Intermediates

An efficient gram scale synthesis of the previously unknown 4,7-di-tert-butylacenaphthenone (3b) is reported. The facile isomerization of epoxide 9b to ketone 3b occurs simply on stirring a solution of 9b with silica gel at room temperature. Aldol cyclotrimerization of 3b with titanium tetrachloride gives 2,5,8,11,14,17-hexa-tert-butylde cacyclene (1b) in 58% isolated yield. X-ray crystal structures have been obtained for the synthetic intermediates 4,7-di-tert-butylacenaphthene (2b) and 4,7-di-tert-butylacenaphthylene (8b).Key words: aromatic, decacyclene, hydrocarbon, nonalternant, polycyclic.

Critical role of nanoinclusions in silver selenide nanocomposites as a promising room temperature thermoelectric material

2019 ◽  
Vol 7 (9) ◽  
pp. 2646-2652 ◽  
Author(s):  
Khak Ho Lim ◽  
Ka Wai Wong ◽  
Yu Liu ◽  
Yu Zhang ◽  
Doris Cadavid ◽  
...  
Keyword(s):  
Seebeck Coefficient ◽  
Room Temperature ◽  
Opposite Effect ◽  
Critical Role ◽  
Free Carrier ◽  
Silver Selenide ◽  
Band Bending ◽  
Seebeck Coefficients ◽  
Electrical Conductivities

The introduction of nonmetal nanoinclusions within Ag2Se results in an interphase band bending that promotes electron filtering and increase Seebeck coefficient. Similar loading of metal nanoinclusions provided an opposite effect-modulating free carrier concentration, as characterized by superior electrical conductivities and lower Seebeck coefficients.

β-Substitution de la méso-tétraphénylporphyrine de zinc par voie électrochimique

1991 ◽  
Vol 69 (7) ◽  
pp. 1161-1165 ◽  
Author(s):  
Alain Giraudeau ◽  
Lana El Kahef
Keyword(s):  
Carbon Atom ◽  
Nucleophilic Substitution ◽  
Key Words ◽  
Electrochemical Oxidation ◽  
Electrochemical Reactions

The electrochemical oxidation of the zinc tetraphenylporphyrin complex in a mixed acetonitrile–dichloroethane solution in the presence of nucleophiles (Py, 3-Pic, [Formula: see text], SCN−) leads to the formation of the corresponding monosubstituted metalloporphyrin. For each of these nucleophiles the substitution occurs at a pyrrole carbon atom (β-substitution). The electrochemical conditions of these substitutions are discussed and an overall reaction is proposed. Key words: porphyrins, electrochemical reactions, nucleophilic substitution.

Electrochemical Oxidation of Nitrite and the Oxidation and Reduction of NO2in the Room Temperature Ionic Liquid [C2mim][NTf2]

2007 ◽  
Vol 111 (27) ◽  
pp. 7778-7785 ◽  
Author(s):  
Tessa L. Broder ◽  
Debbie S. Silvester ◽  
Leigh Aldous ◽  
Christopher Hardacre ◽  
Richard G. Compton
Keyword(s):  
Ionic Liquid ◽  
Electrochemical Oxidation ◽  
Room Temperature ◽  
Room Temperature Ionic Liquid

Bispentiptycenyl-N-Heterocyclic Carbene (NHC) Gold Complexes: Highly Active Catalysts for the Room Temperature Hydration of Alkynes

2018 ◽  
Vol 360 (18) ◽  
pp. 3572-3578 ◽  
Author(s):  
Maximillian Heidrich ◽  
Marvin Bergmann ◽  
Dorian Müller-Borges ◽  
Herbert Plenio
Keyword(s):  
Room Temperature ◽  
Gold Complexes ◽  
Highly Active

Solvent exchange synthesis of C-doped ZnO bunches and their enhanced ethanol sensing properties

2019 ◽  
Vol 13 (02) ◽  
pp. 2050003
Author(s):  
Jingzhou yin ◽  
Qiaoqi Li ◽  
Rongqing Li ◽  
LiLi Zhang ◽  
Chao Tang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Zinc Complex ◽  
Ethanol Vapor ◽  
Solvent Exchange ◽  
Excellent Response ◽  
Good Linearity ◽  
Morphology And Structure ◽  
Potential Applications ◽  
Doped Zno ◽  
Ethanol Sensing

In this study, zinc complex bunches have been synthesized by a simple solvent exchange approach without any surfactant at room temperature. The zinc complex can be converted to C-doped ZnO bunches by a subsequent annealed process at 500∘C for 2[Formula: see text]h. The morphology and structure results show that the rectangle-shaped ZnO bunches are assembled by ZnO disks. The as-prepared C-doped ZnO bunches exhibit the highest sensitivity to 100[Formula: see text]ppm ethanol vapor at 240∘C. In addition the C-doped ZnO bunches also show excellent response-recover properties and stability, and good linearity in the range of 5–400[Formula: see text]ppm for potential applications.

scholarly journals Electrical Conductivity Studies on Co(II), Cu(II),Ni(II) and Cd(II) Complexes of Azines

2008 ◽  
Vol 5 (4) ◽  
pp. 797-801 ◽  
Author(s):  
M. Revanasiddappa ◽  
Syed Khasim ◽  
S. C. Raghavendra ◽  
C. Basavaraja ◽  
T. Suresh ◽  
...  
Keyword(s):  
Room Temperature ◽  
Molar Conductance ◽  
Molar Ratio ◽  
Temperature Conductivity ◽  
Physical Methods ◽  
Alcoholic Medium ◽  
Electrical Conductivities ◽  
Powder Samples ◽  
Higher Temperature ◽  
Uv Visible

1-Phenyl-4-(2'-hydroxyphenyl-1-yl)di-imino azine, {1P-4-(2' HPDA)} 1, 4(2'-hydroxyphenyl-1-yl)di-imino azine, {1, 4-(2' HPDA)} are derived from benzophenone hydrozone with different aldehydes in presence of few drops of concentrated hydrochloric acid in alcoholic medium. Metal(II) complexes have been prepared by salts of CoCl2, CuCl2, NiCl2and CdCl2reacting with azine ligands dissolved in alcohol in the molar ratio of (1:2). The prepared complexes were characterized by using various physical methodsviz. elemental, molar conductance, magnetic susceptibility, IR, NMR, XRD and UV-Visible. Conductivity of the powder samples were measured by two probe method. Measured electrical conductivities of Co(II), Cu(II), Ni(II) and Cd(II) complexes of azines are reported in this paper. It is found that at room temperature these complexes show insulator behavior. At higher temperature conductivity increases linearly, showing semi conducting behavior.

Langmuir-Blodgett films of One-dimensional Nanowires composed of Amphiphilic Tetrathiafulvalenes and Electron Acceptor

2008 ◽  
Vol 1144 ◽  
Author(s):  
Yoko Tatewaki ◽  
Junko Takizawa ◽  
Tatsuya Hatanaka ◽  
Mutsumi Kimura ◽  
Hirofusa Shirai
Keyword(s):  
Electron Acceptor ◽  
Room Temperature ◽  
The Other ◽  
Water Interface ◽  
One Dimensional ◽  
Langmuir Blodgett ◽  
Electrical Conductivities ◽  
Air Water Interface ◽  
Langmuir Blodgett Films ◽  
Mixed Layers

ABSTRACTWe found that novel amphiphilic tetrathiafulvalene (TTF; 1) organized into supramolecular assemblies by the addition of electron acceptor 2,3,5,6-tetrafluoro-7,7'f,8,8'f-tetracyano-p-quinodimethane (F4TCNQ) at the air-water interface. The assemblies on the air-water interface can be transferred onto the surface of mica and the morphologies of transferred films were investigated by AFM. The morphology of Langmuir-Blodgett films strongly depended on the ratio between 1 and F4TCNQ. Film of 1:1 mixture of 1 and F4TCNQ formed nanoscopic wires having an average dimension of 5.0 (height) × 70 (width) × 3000 (length) nm. On the other hand, the film of 2:1 mixture of 1 and F4TCNQ showed the mixed domains of wires and flat monolayers. Thus, the completely charge-transferred complex (1+)(F4TCNQ-) formed one-dimensional nanowires having a micrometer length. Room temperature electrical conductivities of cast film for 1:1 and 2:1 mixed layers of 1 and F4TCNQ were 2.4 × 10−4 and 8.0 × 10−5 S cm−1, respectively.

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