scholarly journals Synthesis and Light Induced Characteristics of Siloxane Substituted Azobenzene: An Application for Optical Storage Device

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
A. R. Yuvaraj ◽  
Md. Lutfor Rahman ◽  
Mashitah Mohd Yusoff
Keyword(s):  
Molecular Structure ◽  
Spectral Analysis ◽  
Nematic Phase ◽  
Molecular Switches ◽  
Optical Storage ◽  
Storage Device ◽  
Long Duration ◽  
Sterically Hindered ◽  
First Time ◽  
Azobenzene Derivatives

The light induced behaviour of siloxane substituted azobenzene compounds in the presence of alkylene spacers is reported for the first time. Firstly, these photosensitive compounds were synthesized and elucidated the molecular structure by spectral analysis such as NMR, FTIR, and UV/Vis. Photoisomerization effect was evaluated in solution and also in nematic phase. The photosaturation occurred exactly at 29 seconds, whereas thermal back relaxation was observed ranging from 19.8 to 23.8 hours. Long duration of the thermal back relaxation is due to the presence of sterically hindered siloxane group substituted to the azobenzene molecules. Decrease in the duration of cis-trans isomerization was found when the number of alkylene spacers was increased. These siloxane based azobenzene derivatives are useful for the fabrication of optical storage device and molecular switches.

Light Induced Properties of Chalcones Correlated with Molecular Structure and Photophysical Properties for Permanent Optical Storage Device

2014 ◽  
Vol 1033-1034 ◽  
pp. 1149-1153 ◽  
Author(s):  
S.N. Sidharth ◽  
A.R. Yuvaraj ◽  
Tay Joo Hui ◽  
B.K. Sarojini ◽  
M. Yusoff Mashitah ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Spectral Analysis ◽  
Photophysical Properties ◽  
Optical Storage ◽  
Storage Device ◽  
Storage Devices ◽  
H Nmr ◽  
Chalcone Derivative ◽  
C Nmr

The photoisomerization effect on new chalcone derivative is reported. The synthesized chalcone was characterized by different spectral analysis such as1H-NMR,13C-NMR, FTIR, LCMS and UV/Vis. It revealed the photoisomerization effect in solution, theE-Zisomerization occurred around 60sec, whereasZ-Eisomerism occurred at 0min. This chalcone derivative is more useful in fabrication of permanent optical storage devices.

Implication of the distinctive bipolar intracardiac electrograms for ventricular arrhythmias arising from different regions of ventricular outflow tract

EP Europace ◽  
2020 ◽  
Vol 22 (9) ◽  
pp. 1367-1375
Author(s):  
Jia Li ◽  
Weiqian Lin ◽  
Cheng Zheng ◽  
Chi Zhang ◽  
Jiji Yu ◽  
...  
Keyword(s):  
Ventricular Arrhythmias ◽  
Ventricular Outflow Tract ◽  
High Amplitude ◽  
Outflow Tract ◽  
Correct Identification ◽  
Aortic Sinus ◽  
Distinctive Features ◽  
Long Duration ◽  
Target Sites ◽  
First Time

Abstract Aims To investigate the characteristics of bipolar intracardiac electrograms (bi-EGMs) in target sites of ventricular arrhythmias (VAs) originating from different regions of ventricular outflow tract (VOT). Methods and results Two hundred and seventy patients undergoing first-time ablation for VAs originated from distal great cardiac vein (DGCV), aortic sinus cusps (ASCs), or pulmonary sinus cusps (PSCs) were enrolled in present study. Local intracardiac bipolar recordings on 243 successful sites and 506 attempted but unsuccessful ablation sites were analysed. Specific potentials in bi-EGMs on successful sites were more common compared with unsuccessful sites (76.95%, 187/243 vs. 25.49%, 129/506, P < 0.05). A total of 60.00% (81/135) patients in ASCs group presented a presystolic short-duration fractionated potential, higher than 23.21% (13/56) in DGCV and 23.08% (12/52) in PSCs (all P < 0.05); 44.23% (23/52) patients in PSC group showed a presystolic high-amplitude discrete potential, while 1.79% (1/56) in DGCV and 2.22% (3/135) in ASCs (all P < 0.05); 41.07% (23/56) patients in DGCV group showed bi-EGMs of presystolic long-duration multicomponent fractionated potential, which was significantly higher than 3.85% (2/52) in PSCs and 4.44%(6/135) in ASCs (all P < 0.05). Conclusion Distinctive morphology of bi-EGMs during VAs can be found in different regions of VOT, which probably due to changes in the arrangements of myocardial sleeves. Correct identification and better understanding of the distinctive features of these bi-EGMs with regards to the anatomic location was important, the presence of specific potentials may add help in successful ablation.

Synthesis and Molecular Structure of Disulfane

1991 ◽  
Vol 46 (10) ◽  
pp. 1338-1342 ◽  
Author(s):  
Josef Hahn ◽  
Petra Schmidt ◽  
Klaus Reinartz ◽  
Jörg Behrend ◽  
Gisbert Winnewisser ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Dihedral Angle ◽  
Trichloroacetic Acid ◽  
Microwave Spectroscopy ◽  
Stabilizing Agent ◽  
Rotary Evaporator ◽  
First Time

The synthesis and structure of disulfane are presented. Pure disulfane, H2S2, has been obtained by the cracking distillation of raw sulfane mixtures in a rotary evaporator, thus substituting the classical cracking column for the rotating flask of the evaporator. Pure, gaseous dideuterodisulfane could be generated by the solvolysis of bis(methyldiphenylsilyl)disulfane, (MePh2Si)2S2, with D2O in the presence of trichloroacetic acid as stabilizing agent. Partially deuterated disulfane has been prepared by H,D exchange between pure H2S2 and DCl. For the first time the molecular structure of HSSH has been determined based solely on microwave spectroscopy with the following parameters: r(SS) = 2.0564 A, r(SH) = 1.3421 A, dihedral angle γ = 90.34°, and <(SSH) = 97.88°.

Defining the molecular structure of teixobactin analogues and understanding their role in antibacterial activities

2017 ◽  
Vol 53 (12) ◽  
pp. 2016-2019 ◽  
Author(s):  
Anish Parmar ◽  
Stephen H. Prior ◽  
Abhishek Iyer ◽  
Charlotte S. Vincent ◽  
Dorien Van Lysebetten ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Antibacterial Activities ◽  
Key Residues ◽  
First Time

In this work, we have for the first time defined the molecular structure of seven teixobactin analogues through the variation of the d/l configuration of its key residues.

Synthesis, molecular structure, and spectral analysis of copper(II) complexes derived from pyridinediols

2014 ◽  
Vol 68 (2) ◽  
pp. 206-219 ◽  
Author(s):  
Guillermo M. Chans ◽  
Elizabeth Gómez ◽  
Virginia Gómez-Vidales ◽  
R. Alfredo Toscano ◽  
Cecilio Álvarez-Toledano
Keyword(s):  
Molecular Structure ◽  
Spectral Analysis

AN ANALYSIS OF THE THZ FREQUENCY SIGNATURES IN THE CELLULAR COMPONENTS OF BIOLOGICAL AGENTS

2007 ◽  
Vol 17 (02) ◽  
pp. 225-237 ◽  
Author(s):  
ALEXEI BYKHOVSKI ◽  
TATIANA GLOBUS ◽  
TATYANA KHROMOVA ◽  
BORIS GELMONT ◽  
DWIGHT WOOLARD
Keyword(s):  
Molecular Structure ◽  
Structural Similarity ◽  
Md Simulations ◽  
Detection Capability ◽  
Dna Structures ◽  
E Coli ◽  
Cellular Components ◽  
First Time ◽  
Insight Into ◽  
Specific Contribution

The development of an effective biological (bio) agent detection capability based upon terahertz (THz) frequency absorption spectra will require insight into how the constituent cellular components contribute to the overall THz signature. In this work, the specific contribution of ribonucleic acid (RNA) to THz spectra is analyzed in detail. Previously, it has only been possible to simulate partial fragments of the RNA (or DNA) structures due to the excessive computational demands. For the first time, the molecular structure of the entire transfer RNA (tRNA) molecule of E. coli was simulated and the associated THz signature was derived theoretically. The tRNA that binds amino acid tyrosine (tRNAtyr) was studied. Here, the molecular structure was optimized using the potential energy minimization and molecular dynamical (MD) simulations. Solvation effects (water molecules) were also included explicitly in the MD simulations. To verify that realistic molecular signatures were simulated, a parallel experimental study of tRNAs of E. coli was also conducted. Two very similar molecules, valine and tyrosine tRNA were investigated experimentally. Samples were prepared in the form of water solutions with the concentrations in the range 0.01-1 mg/ml. A strong correlation of the measured THz signatures associated with valine tRNA and tyrosine tRNA was observed. These findings are consistent with the structural similarity of the two tRNAs. The calculated THz signature of the tyrosine tRNA of E. coli reproduces many features of our measured spectra, and, therefore, provides valuable new insights into bio-agent detection.

Vibrational Spectroscopic Investigation of Glycine Binding in a Zirconium—Aluminum—Glycine Antiperspirant Material

1979 ◽  
Vol 33 (2) ◽  
pp. 114-118
Author(s):  
Richard P. Oertel ◽  
Rhonda M. Rush
Keyword(s):  
Spectral Analysis ◽  
Infrared Spectroscopy ◽  
Spectroscopic Investigation ◽  
Spectral Features ◽  
Vibrational Modes ◽  
Infrared Band ◽  
Raman And Infrared Spectroscopy ◽  
Almost All ◽  
First Time ◽  
Inhibiting Property

Through use of Raman and infrared spectroscopy, we have determined the mode of incorporation of glycine, a gelation inhibitor, in a complex antiperspirant material (ZAG) containing zirconium and aluminum hydroxy chlorides. Most of the vibrational modes of glycine are affected upon inclusion of this component in ZAG. Our spectral analysis indicates that the glycine in ZAG exists as the dipolar ion, coordinated to metal ions through the COO− end and hydrogen bonded to various constituents through the NH3+ end. Almost all of the glycine in solid ZAG is bound in this fashion, as is more than half of the glycine in a 50% (by wt.) aqueous ZAG solution. This binding could well contribute to the gelation-inhibiting property of the glycine in aqueous ZAG by interfering with the extended hydroxy and oxy bridging that commonly exists in solutions containing Zr(IV) and Al(III). Several spectral features of the bound glycine dipolar ion, most especially a prominent Raman and infrared band near 1475 cm−1, are discussed in detail for the first time.

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