Room temperature reaction between polycrystalline Ni/Al bilayers deposited in ultrahigh vacuum

1990 ◽  
Vol 8 (1) ◽  
pp. 134-140 ◽  
Author(s):  
M. W. Ruckman ◽  
L. Jiang ◽  
Myron Strongin
Keyword(s):  
Room Temperature ◽  
Ultrahigh Vacuum ◽  
Temperature Reaction

Fragmentation, Catenation, and Direct Functionalisation of White Phosphorus by a Uranium(IV)-Silyl-Phosphino-Carbene Complex

2021 ◽  
Author(s):  
Josef Boronski ◽  
John Seed ◽  
Ashley Wooles ◽  
Stephen Liddle
Keyword(s):  
Room Temperature ◽  
White Phosphorus ◽  
Temperature Reaction ◽  
Carbene Complex

Room temperature reaction of the uranium(IV)-carbene [U{C(SiMe3)(PPh2)}(BIPMTMS)(μ-Cl)Li(TMEDA)(μ-TMEDA)0.5]2 (1, BIPMTMS = C(PPh2NSiMe3)2) with white phosphorus (P4) produces the organo-P5 compound [P5{C(SiMe3)(PPh2)}2][Li(TMEDA)2] (2) and the uranium(IV)-methanediide [U{BIPMTMS}{Cl}{μ-Cl}2{Li(TMEDA)}] (3). This is an unprecedented...

On the existence of a stable, room temperature dihydride-terminated Ge(100) surface in ultrahigh vacuum

2008 ◽  
Vol 602 (12) ◽  
pp. 2055-2060 ◽  
Author(s):  
Grant Underwood ◽  
Lynette Keller Ballast ◽  
Alan Campion
Keyword(s):  
Room Temperature ◽  
Ultrahigh Vacuum

A hexaniobate expanded by six [Hg(cyclam)]2+ complexes via Hg–O bonds yields a positively charged polyoxoniobate cluster

2020 ◽  
Vol 75 (1-2) ◽  
pp. 233-237 ◽  
Author(s):  
Philipp Müscher-Polzin ◽  
Christian Näther ◽  
Wolfgang Bensch
Keyword(s):  
Hydrogen Bonding ◽  
Title Compound ◽  
Room Temperature ◽  
Bond Formation ◽  
Water Molecules ◽  
The Novel ◽  
Temperature Reaction ◽  
Crystal Water ◽  
Nitrate Anions ◽  
Positively Charged

AbstractThe room temperature reaction of Hg(NO3)2 · H2O, cyclam (cyclam = 1,4,8,11-tetraazacyclotetradecane) and K8{Nb6O19} · 16 H2O in a mixture of H2O and DMSO led to crystallization of the novel compound {[Hg(cyclam)]6Nb6O19}(NO3)4 · 14 H2O, which is the first mercury containing polyoxoniobate. The structure consists of a {Nb6O19}8− cluster core which is expanded by six [Hg(cyclam)]2+ complexes via Hg–μ2-O–Nb bond formation. The title compound contains a positively charged polyoxoniobate cluster. The crystal water molecules form small aggregates by O–H · · · O hydrogen bonding which are joined into larger aggregates by N–O · · · H–O hydrogen bonding integrating the nitrate anions.

Room‐temperature reaction of a Ni/Bi2Sr2CaCu2O8interface

1990 ◽  
Vol 67 (6) ◽  
pp. 3184-3187 ◽  
Author(s):  
P. S. Asoka Kumar ◽  
Shailaja Mahumuni ◽  
Pramada Kulkarni ◽  
I. S. Mulla ◽  
M. Chandrachood ◽  
...  
Keyword(s):  
Room Temperature ◽  
Temperature Reaction

scholarly journals Structural and optical properties of europium doped Y2O3 nanoparticles prepared by self-propagation room temperature reaction method

2013 ◽  
Vol 37 (1) ◽  
pp. 39-45 ◽  
Author(s):  
Sanja Ćulubrk ◽  
Vesna Lojpur ◽  
Željka Antić ◽  
Miroslav D. Dramićanin
Keyword(s):  
Room Temperature ◽  
Unit Cell Volume ◽  
Synthesis Method ◽  
Optical Characterization ◽  
Oxide Nanoparticles ◽  
Temperature Reaction ◽  
Structural And Optical Properties ◽  
Red Emission ◽  
Reaction Method ◽  
Yttrium Oxide Nanoparticles

Abstract Europium-doped yttrium oxide nanoparticles with different doping concentrations were prepared by self-propagation room temperature reaction method. This simple synthesis method provides particles in the range of 12nm to 50 nm, depending on the temperature of calcination. In all cases, the nanopowders showed intense red emission upon excitation with ultraviolet radiation. Structural and optical characterization showed that the nanoparticles obtained after calcination at 1100°C have smaller unit cell volume and microstrain and longer emission lifetimes compared to the nanoparticles obtained after calcination at 600°C and 800°C. The maximal emission intensity was found for the sample doped with 5at% of Eu3+.

Surface-assisted cis–trans isomerization of an alkene molecule on Cu(110)

2014 ◽  
Vol 50 (14) ◽  
pp. 1728-1730 ◽  
Author(s):  
Qiang Sun ◽  
Chi Zhang ◽  
Likun Wang ◽  
Zhiwen Li ◽  
Aiguo Hu ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Room Temperature ◽  
Ultrahigh Vacuum ◽  
Trans Isomerization ◽  
Isomerization Process

Interplay of STM imaging and DFT calculations demonstrates the isomerization of an alkene molecule on Cu(110) under ultrahigh vacuum conditions. We show that the on-surfacecis–transisomerization could efficiently occur well below room temperature, in which the surface is speculated to play a key role in assisting this isomerization process.

Some reactions of 2,4-dimethoxytetrahydropyrans

1969 ◽  
Vol 47 (17) ◽  
pp. 3099-3106 ◽  
Author(s):  
M. J. Baldwin ◽  
R. K. Brown
Keyword(s):  
Room Temperature ◽  
Equilibrium Mixture ◽  
Anomeric Effect ◽  
Temperature Reaction ◽  
Trans Isomers ◽  
Kcal Mole ◽  
A Value ◽  
Cis And Trans Isomers ◽  
Acid Catalyzed ◽  
Cis And Trans

Acid-catalyzed elimination of methanol from 2,4-dimethoxytetrahydropyran (1) produces 2-methoxy-5,6-dihydro-2H-pyran (3) rather than the expected olefin 4-methoxy-3,4-dihydro-2H-pyran (2).The reaction of 1,3-dibromo-5,5-dimethylhydantoin with 3 in ether – methanol gives a 2:1 mixture of the isomers 3β-bromo-2α,4α-dimethoxytetrahydropyran (5a) and 3α-bromo-2α,4β-dimethoxytetrahydropyran (5b) respectively. A rationale is given to explain the preponderance of 5a over 5b and the highly selective attack of the bromine of the hydantoin and the methanol on C-3 and C-4 respectively of the double bond of 3. Reduction of 5ab with zinc in ethanol provides only compound 3.The room temperature reaction of 1 in a mixture of water and 1,2-dimethoxyethane containing Amberlite IR-120, produces 2-hydroxy-4-methoxytetrahydropyran (6) as an equilibrium mixture of cis and trans isomers in the ratio 1:1. This gave a value of 0.9 kcal/mole for the anomeric effect in 6. Pyrolysis of the derivative, 2-acetoxy-4-methoxytetrahydropyran failed to produce the olefin 2 and resulted only in extensive decomposition.

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