Photoinduced double [2 + 2] cycloaddition relay of yne–allenones for highly diastereoselective synthesis of hexacyclic 1-naphthols

2020 ◽  
Vol 7 (19) ◽  
pp. 2975-2980 ◽  
Author(s):  
Shan-Shan Zhu ◽  
Jiang-Nan Zhou ◽  
Quan-Long Wu ◽  
Wen-Juan Hao ◽  
Shu-Jiang Tu ◽  
...  
Keyword(s):  
Free Energy ◽  
Energy Transfer ◽  
Diastereoselective Synthesis ◽  
First Time

A new photoinduced photocatalyst-free energy-transfer strategy for double [2 + 2] cycloaddition relay of yne–allenones is reported for the first time and used to produce a series of hitherto unreported hexacyclic 1-naphthols.

scholarly journals Enhanced visible and near infrared emissions via Ce3+to Ln3+energy transfer in Ln3+-doped CeF3nanocrystals (Ln = Nd and Sm)

2016 ◽  
Vol 45 (1) ◽  
pp. 78-84 ◽  
Author(s):  
Tuhin Samanta ◽  
Shyam Sarkar ◽  
Venkata. N. K. B. Adusumalli ◽  
Athma E. Praveen ◽  
Venkataramanan Mahalingam
Keyword(s):  
Energy Transfer ◽  
Near Infrared ◽  
Colloidal Nanocrystals ◽  
Infrared Emissions ◽  
First Time

We report the enhancement of both visible and near infrared (NIR) emissions from Nd3+ionsviaCe3+sensitization in colloidal nanocrystals for the first time.

scholarly journals The Physical and Thermodynamic Functions of Borides

2017 ◽  
Vol 18 (1) ◽  
pp. 58-63
Author(s):  
N.Yu. Filonenko
Keyword(s):  
Free Energy ◽  
Physical Properties ◽  
Thermodynamic Functions ◽  
Point Of View ◽  
Energy Potential ◽  
High Temperature Expansion ◽  
Temperature Dependences ◽  
Function Calculation ◽  
First Time ◽  
Good Agreement

In the paper the physical properties and thermodynamic functions of borides Х2В (Х=W, Mo, Mn, Fe, Co, Ni та Cr) are studied with accounting for fluctuation processes. We use the microstructure analysis, the X-ray structural and the durometric analyses to determine the physical properties of alloys. In the paper it is determined the phase composition and physical properties of borides. In this paper for the first time it is determined the thermodynamic functions of borides using the Hillert and Staffansson model with accounting for the first degree approximation of high-temperature expansion for the free energy potential of binary alloys. We obtain the temperature dependences for such thermodynamic functions as Gibbs free energy, entropy, enthalpy and heat capacity Ср along with their values at the formation temperature for Х2В (Х=W, Mo, Mn, Fe, Co, Ni та Cr). The approach under consideration enables to give more thorough from the thermodynamic point of view description of borides formed from the liquid. The outcomes of the thermodynamic function calculation for borides are in good agreement with experimental data and results of other authors.

Autocatalytic amplified detection of DNA based on a CdSe quantum dot/folic acid electrochemiluminescence energy transfer system

The Analyst ◽  
2015 ◽  
Vol 140 (1) ◽  
pp. 79-82 ◽  
Author(s):  
Guifen Jie ◽  
Yingqiang Qin ◽  
Qingmin Meng ◽  
Jialin Wang
Keyword(s):  
Energy Transfer ◽  
Folic Acid ◽  
Quantum Dot ◽  
Transfer System ◽  
Cdse Qds ◽  
System P ◽  
Cdse Quantum Dot ◽  
Autocatalytic System ◽  
First Time

Electrochemiluminescence energy transfer from CdSe QDs to folic acid was applied for the first time for amplified detection of DNA by a DNAzyme autocatalytic system.

scholarly journals Direct evidence of charge separation in a metal–organic framework: efficient and selective photocatalytic oxidative coupling of amines via charge and energy transfer

2018 ◽  
Vol 9 (12) ◽  
pp. 3152-3158 ◽  
Author(s):  
Caiyun Xu ◽  
Hang Liu ◽  
Dandan Li ◽  
Ji-Hu Su ◽  
Hai-Long Jiang
Keyword(s):  
Energy Transfer ◽  
Charge Separation ◽  
Oxidative Coupling ◽  
Direct Evidence ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
First Time ◽  
Organic Framework

For the first time, the photoexcited charge separation in a metal–organic framework has been evidenced with clear ESR signals, based on efficient and selective photocatalytic oxidative coupling of amines.

Electrochemically triggered upconverted luminescence for light-emitting devices

2019 ◽  
Vol 55 (84) ◽  
pp. 12611-12614 ◽  
Author(s):  
Haruki Minami ◽  
Takuya Ichikawa ◽  
Kazuki Nakamura ◽  
Norihisa Kobayashi
Keyword(s):  
Energy Transfer ◽  
Triplet Energy ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Triplet Energy Transfer ◽  
First Time ◽  
Triplet Triplet Annihilation

Electrochemically triggered upconverted luminescence through triplet–triplet energy transfer (TTET) and subsequent triplet–triplet annihilation upconversion (TTA-UC) is observed for the first time.

CARS (coherent anti-Stokes Raman scattering) investigations of the intermolecular vibrational energy transfer between nitrogen and carbon dioxide molecules

1993 ◽  
Vol 71 (3-4) ◽  
pp. 142-146 ◽  
Author(s):  
L. Wang ◽  
J. R. Xu ◽  
W. E. Jones
Keyword(s):  
Carbon Dioxide ◽  
Energy Transfer ◽  
Raman Scattering ◽  
Rate Constants ◽  
Transfer Rate ◽  
Vibrational Energy ◽  
Vibrational Energy Transfer ◽  
Scattering Technique ◽  
Anti Stokes ◽  
First Time

The CARS (coherent anti-Stokes Raman scattering) technique has been used for the first time to observe directly the vibrational energy transfer between nitrogen N2 (X1Σ, ν = 1, 2) and carbon dioxide. The transfer-rate constants were determined as (1.0 ± 0.1) × 1011 cm3 mol−1 s−1 and (1.7 ± 0.4) × 1011 cm3 mol−1 s−1 for N2(ν = 1) and N2(ν = 2), respectively.

scholarly journals Thermo-Solutal Modelling of Microstructure Formation during Multiphase Alloy Solidification - a New Approach

2014 ◽  
Vol 790-791 ◽  
pp. 103-108
Author(s):  
Peter C. Bollada ◽  
Andrew M. Mullis ◽  
Peter K. Jimack
Keyword(s):  
Free Energy ◽  
Dynamical Equations ◽  
New Approach ◽  
Phase Field Models ◽  
Diffusion Parameters ◽  
Multiphase Alloy ◽  
Standard Models ◽  
Multi Phase ◽  
First Time ◽  
Temperature Equation

This paper shows how to move from a specification of free energy for the solidification of a binary alloy to the dynamical equations using the elegance of a dissipative bracket analogous to the Poisson bracket of Hamiltonian mechanics. A key new result is the derivation of the temperature equation for single-phase thermal-solutal models, which contains generalisations and extra terms which challenge standard models. We also present, for the first time, the temperature equation for thermal multi-phase field models. There are two main ingredients: one, the specification of the free energy in terms of the time and space dependent field variables: $n$-phases $\phi_i$, a concentration variable $c$, and temperature $T$; two, the specification of the dissipative bracket in terms of these variables, their gradients and a set of diffusion parameters, which may themselves depend on the field variables. The paper explains the method within this context and demonstrates its thermodynamic admissibility.

scholarly journals Momentum flux parasitic to free-energy transfer

2017 ◽  
Vol 57 (8) ◽  
pp. 086036 ◽  
Author(s):  
T. Stoltzfus-Dueck ◽  
B. Scott
Keyword(s):  
Free Energy ◽  
Energy Transfer ◽  
Momentum Flux

scholarly journals Picosecond Absorption Spectroscopy of Energy Transfer Processes in Polymethine Dyes

1990 ◽  
Vol 10 (3) ◽  
pp. 139-145 ◽  
Author(s):  
K. -H. Feller ◽  
R. Gadonas ◽  
V. Krasauskas
Keyword(s):  
Energy Transfer ◽  
Transient Absorption ◽  
Iron Complex ◽  
Polymethine Dyes ◽  
Acceptor Molecule ◽  
Time Resolved ◽  
Transfer Processes ◽  
Energy Donor ◽  
First Time ◽  
Polymethine Dye

Results are presented of time-resolved absorption investigations of energy transfer processes between a polymethine dye and an iron complex dye (dye E). For the first time the acceptor molecule transient absorption depletion generated by energy transfer from an excited donor was observed. The decay time of the acceptor deactivation (≈ 140 Ps) in the presence of the energy donor agrees very well with the S1-state lifetime of the energy donor.

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