Synthesis and electronic properties of π-expanded carbazole-based porphyrins

2019 ◽  
Vol 55 (68) ◽  
pp. 10162-10165 ◽  
Author(s):  
Chihiro Maeda ◽  
Yumi Tanaka ◽  
Takuma Shirakawa ◽  
Tadashi Ema
Keyword(s):  
Electronic Properties ◽  
First Time ◽  
Pt Catalyzed

Peripheral π-expansion of carbazole-based porphyrins was achieved for the first time by the Pt-catalyzed cyclization and the incorporation of a benzocarbazole unit.

Heteroarray of cobalt(II)tetrasulfophthalocyanine and cobalt(II) tetrakis(N-methyl-4-pyridyl)porphyrin: synthesis, isolation and electronic properties

2012 ◽  
Vol 16 (02) ◽  
pp. 244-249 ◽  
Author(s):  
Thiago T. Tasso ◽  
Wania C. Moreira
Keyword(s):  
Electronic Properties ◽  
Spectroscopic Characterization ◽  
Charge Transfer Process ◽  
Isolation And Purification ◽  
Electronic Densities ◽  
Porphyrin Synthesis ◽  
A Charge ◽  
Job's Method ◽  
First Time

Porphyrin and phthalocyanine macrocycles with ionic substituents can form mixed assemblies with interesting electronic properties for potential application on the development of new devices. This paper reports the synthesis, isolation and purification of heteroaggregate formed by cobalt(II) 4,4′,4″,4‴-tetrasulfophthalocyanine (CoTsPc) and cobalt(II) tetrakis(N-methyl-4-pyridyl)porphyrin (CoTMPyP), followed by its spectroscopic characterization. Spectroscopic titration, performed with a CoTsPc water/acetone solution, allowed the use of Job's method for determination of the heteroaggregates stoichiometry. The Job's plot revealed the formation of only one predominant heterocomplex in solution, containing two CoTsPc molecules in terminal positions and a central CoTMPyP one. For the first time, a method for isolation and purification of a mixed ionic array has been reported in the literature. The triad's electronic spectrum is quite different from the sum of the macrocycles isolated spectra, due to the overlap of their electronic densities and a charge transfer process between CoTsPc and CoTMPyP.

scholarly journals Structure, electronic properties, morphology evolution, and photocatalytic activity in PbMoO4 and Pb1−2xCaxSrxMoO4 (x = 0.1, 0.2, 0.3, 0.4 and 0.5) solid solutions

2020 ◽  
Vol 22 (44) ◽  
pp. 25876-25891
Author(s):  
E. O. Gomes ◽  
L. Gracia ◽  
A. A. G. Santiago ◽  
R. L. Tranquilin ◽  
F. V. Motta ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Electronic Properties ◽  
Solid Solutions ◽  
Precipitation Method ◽  
Morphology Evolution ◽  
Water Based ◽  
Co Precipitation ◽  
First Time

In this work PbMoO4 and Pb1−2xCaxSrxMoO4 (x = 0.1, 0.2, 0.3, 0.4 and 0.5) solid solutions have been successfully prepared, for the first time, by a simple co-precipitation method and the as-synthesized samples were subjected to a water-based reflux treatment.

scholarly journals Iridium-Catalyzed Asymmetric α-Allylic Alkylation of Amides using Vinyl Azide as Amide Enolate Surrogate

2020 ◽  
Author(s):  
Aditya Chakrabarty ◽  
Santanu Mukherjee
Keyword(s):  
Electronic Properties ◽  
Reaction Pathways ◽  
Allylic Alcohols ◽  
Allylic Alkylation ◽  
Atom Economy ◽  
Asymmetric Allylic Alkylation ◽  
Vinyl Azides ◽  
Alkylation Reactions ◽  
First Time

Among the unstabilized enolates used as nucleophile in iridium-catalyzed asymmetric allylic alkylation reactions, amide enolates are least explored. Vinyl azides are now employed as amide enolate surrogate for the first time in Ir-catalyzed asymmetric allylic alkylation with branched allylic alcohols as the allylic electrophile. Competing reaction pathways are suppressed through systematic tuning of steric and electronic properties of vinyl azide to effect α-allylic alkylation of secondary acetamides with high atom-economy, exclusive branched selectivity and moderate to excellent enantioselectivity.<br>

scholarly journals Charge transfer in steam purified arc discharge single walled carbon nanotubes filled with lutetium halides

2020 ◽  
Vol 22 (18) ◽  
pp. 10063-10075
Author(s):  
Ana Santidrián ◽  
Magdalena Kierkowicz ◽  
Elzbieta Pach ◽  
Denisa Darvasiová ◽  
Belén Ballesteros ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Charge Transfer ◽  
Electronic Properties ◽  
Arc Discharge ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
First Time ◽  
Effect Of Doping

In the present work, the effect of doping on electronic properties in bulk purified and filled arc-discharge single-walled carbon nanotubes samples is studied for the first time by in situ Raman spectroelectrochemical method.

scholarly journals Characterization and Electronic Properties of Heptazine Layers: Towards Promising Interfacial Materials for Organic Optoelectronics

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3826
Author(s):  
Issoufou Ibrahim Zamkoye ◽  
Houda El Gbouri ◽  
Remi Antony ◽  
Bernard Ratier ◽  
Johann Bouclé ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Energy Levels ◽  
Thin Layers ◽  
Kelvin Probe ◽  
Conductive Atomic Force Microscopy ◽  
Force Microscopy ◽  
Organic Optoelectronics ◽  
Atomic Force ◽  
Force Mode ◽  
First Time

For the first time, an original compound belonging to the heptazine family has been deposited in the form of thin layers, both by thermal evaporation under vacuum and spin-coating techniques. In both cases, smooth and homogeneous layers have been obtained, and their properties evaluated for eventual applications in the field of organic electronics. The layers have been fully characterized by several concordant techniques, namely UV-visible spectroscopy, steady-state and transient fluorescence in the solid-state, as well as topographic and conductive atomic force microscopy (AFM) used in Kelvin probe force mode (KPFM). Consequently, the afferent energy levels, including Fermi level, have been determined, and show that these new heptazines are promising materials for tailoring the electronic properties of interfaces associated with printed electronic devices. A test experiment showing an improved electron transfer rate from a tris-(8-hydroxyquinoline) aluminum (Alq3) photo-active layer in presence of a heptazine interlayer is finally presented.

scholarly journals The New Phenomenon of Lithium Electrochemical (De)Intercalation in Mineral Clay Materials and Their Potential Application in Rechargeable Batteries

1994 ◽  
Vol 16 (3-4) ◽  
pp. 145-152
Author(s):  
Shi-Jie Wen ◽  
Xiao-Tian Yin ◽  
L. Nazar
Keyword(s):  
Metal Oxide ◽  
Electronic Properties ◽  
Conducting Polymer ◽  
Potential Application ◽  
Rechargeable Batteries ◽  
First Time ◽  
Discharge Potential ◽  
Clay Materials

A new phenomenon of Li electrochemical (de)intercalation on the pure mineral clay materials has been evidenced for the first time. These tests are initialized by the idea of putting an electronic conducting polymer or a multi-valent metal oxide in the layer of the clay to modify the electronic properties and also to modulate the charge and discharge potential of the clay during the Lithium electrochemical (de)intercalation processing. In this paper, as the beginning of our research, we will first show the results of Lithium electrochemical charge and discharge processes on pure clay materials.

Self-Energy corrections to DFT-LDA Gaps of Realistic Carbon Nanotubes

2001 ◽  
Vol 703 ◽  
Author(s):  
Guido Satta ◽  
Giancarlo Cappellini ◽  
Francesco Casula
Keyword(s):  
Carbon Nanotubes ◽  
Band Gap ◽  
Electronic Properties ◽  
Crucial Point ◽  
Excitation Energies ◽  
Self Energy ◽  
Microelectronic Devices ◽  
First Time

ABSTRACTSince their discovery carbon nanotubes have attracted much interest for their peculiar electronic properties which go from metalic to semiconducting behaviour, depending both on diameter and chirality. The exact vaue of their band gap is obviously a crucial point to be addressed because it enters in the nanotube application as microelectronic devices. By making use of an efficient GW scheme, previousy tested on bulk systems, as well as of a model screening function, we obtained for the first time excitation energies and band-gap vaues for carbon nanotubes. Results for (6,0) and (7,0) will be presented and discussed.

scholarly journals First-principles study of the structural, electronic, and elastic properties of Sc2SiX (X=C, N)

2021 ◽  
Vol 67 (3 May-Jun) ◽  
pp. 500
Author(s):  
M. Mebrek ◽  
M. Berber ◽  
B. Doumi ◽  
A. Mokaddem
Keyword(s):  
Electronic Properties ◽  
Elastic Constants ◽  
First Principles ◽  
Formation Energy ◽  
Elastic Anisotropy ◽  
Surface Characteristics ◽  
Hexagonal Structure ◽  
Main Factors ◽  
The Individual ◽  
First Time

Using ab-initio calculations, we studied the structural, elastic, and electronic properties of Sc2SiX compounds with, (X=C, N). The negative formation energy and the positive cohesive energy indicate that these compounds are energetically stable and can be synthesized in normal conditions. Sc2SiC and Sc2SiN compounds are mechanically stable, estimated by the individual elastic constants. Elastic constants and modulus increase when C is substituted by N. The elastic anisotropy in Sc2SiC is high compared to Sc2SiN. Both nanolaminates are fragile in nature. Sc2SiC is more conductive than Sc2SiN. The calculated electron band structures and the density of states imply that the chemical bond in two compounds is a combination of covalent, ionic, and metallic nature. The main factors governing the electronic properties are the hybrid states Sc- 3d, Si-3p, and C -2p and the bond (p-d) stabilizes the structure. Fermi's surface characteristics have been studied for the first time, which are changed when replacing N by C. Based on the estimate of the total energy, we conclude that the replacement of C by N will lead to a stabilization of the hexagonal structure and a decrease of the metallic support.

Electronic Properties of RF Glow Discharge Intrinsic Microcrystalline Silicon near the Amorphous Silicon Phase Boundary

2004 ◽  
Vol 808 ◽  
Author(s):  
James J. Gutierrez ◽  
Adam F. Halverson ◽  
Eric D. Tweeten ◽  
J. David Cohen ◽  
Baojie Yan ◽  
...  
Keyword(s):  
Glow Discharge ◽  
Electronic Properties ◽  
Minority Carrier ◽  
Microcrystalline Silicon ◽  
Silicon Phase ◽  
Doping Density ◽  
Rf Glow Discharge ◽  
First Time ◽  
Discharge Method ◽  
Defect Densities

ABSTRACTThe electronic properties of microcrystalline silicon have been characterized for the first time using transient photocapacitance spectroscopy (TPC) and drive-level capacitance profiling (DLCP). These methods were applied to microcrystalline films deposited by the RF glow discharge method at United Solar. The DLCP method allowed the shallow doping density to be profiled and the deep defect densities to be estimated. The TPC spectra were found to reveal that both a microcrystalline as well as an amorphous component are present in these samples. By varying the measurement temperature for these TPC spectra we were also able to directly monitor the degree of minority carrier collection in these films. Significant effects due to light soaking on the TPC spectral properties were also observed.

scholarly journals Synthesis and electronic properties of nitrogen-bridged dimers of boron subphthalocyanines

2016 ◽  
Vol 52 (63) ◽  
pp. 9793-9796 ◽  
Author(s):  
J. Guilleme ◽  
D. González-Rodríguez ◽  
T. Torres
Keyword(s):  
Electronic Properties ◽  
Synthesis And Characterization ◽  
New Family ◽  
First Time

We describe for the first time the synthesis and characterization of a new family of subphthalocyanine derivatives, the μ-azo dimers, in which two closely interacting macrocycles are axially linked together by a B–N–B bridge.

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