Study of the effect of aliphatic and π-conjugated systems on the photophysical properties of polypyridinic Ruthenium II complexes as potential semiconductor materials for iTMC type LEC

2014 ◽  
Vol 421 ◽  
pp. 255-259 ◽  
Author(s):  
Felipe A. Angel ◽  
Bárbara Loeb
Keyword(s):  
Photophysical Properties ◽  
Semiconductor Materials ◽  
Conjugated Systems

The impact of heteroatom substitution on cross-conjugation and its effect on the photovoltaic performance of DSSCs – a computational investigation of linear vs. cross-conjugated anchoring units

2018 ◽  
Vol 20 (35) ◽  
pp. 22660-22673 ◽  
Author(s):  
Mahalingavelar Paramasivam ◽  
Ramesh Kumar Chitumalla ◽  
Joonkyung Jang ◽  
Ji Ho Youk
Keyword(s):  
Photophysical Properties ◽  
Energy Levels ◽  
Photovoltaic Performance ◽  
Computational Investigation ◽  
Conjugated Systems ◽  
Reverse Trend ◽  
Heteroatom Substitution ◽  
The Impact

The heteroatom substitution on cross conjugation takes a reverse trend to the linear π-conjugated systems by means of energy levels and photophysical properties. The resultant changes directly affecting the photovoltaic performance of DSSCs.

Metal-to-Ligand Charge Transfer Excited States in π-Conjugated Systems

2001 ◽  
Vol 665 ◽  
Author(s):  
Yiting Li ◽  
C. Ed Whittle ◽  
Keith A. Walters ◽  
Kevin D. Ley ◽  
Kirk S. Schanze
Keyword(s):  
Optical Properties ◽  
Charge Transfer ◽  
Excited States ◽  
Transition Metal Complexes ◽  
Transient Absorption ◽  
Photophysical Properties ◽  
Transient Absorption Spectroscopy ◽  
Conjugated Oligomers ◽  
Conjugated Systems ◽  
Ligand Charge Transfer

ABSTRACTThis paper overviews recent work that examined the optical properties of mono-disperse, PPE-based π-conjugated oligomers that contain a 2,2-bipyridine-5,5'-diyl metal coordinating unit. The photophysical properties of the free oligomers and metallated oligomers that contain the -Ru(bpy)22+ and -Re(CO)3Cl transition metal complexes coordinated to the bpy-diyl unit have been characterized by absorption, photoluminescence and transient absorption spectroscopy. In addition, we report the photophysics of a novel organometallic “square” that features “sides” consisting of a PPE-type π-conjugated oligomer and “corners” that consist of (dbubpy)PtII(acetylide)2 units (where dbubpy = 4,4'-di-tert-butyl-2,2'-bipyridine).

Design of novel conjugated systems bearing donor-acceptor groups (pyrene-bodipy): Optical, photophysical properties and energy transfer

2021 ◽  
Vol 185 ◽  
pp. 108925
Author(s):  
Andrea García-Rodríguez ◽  
Pasquale Porcu ◽  
Aldo S. Estrada-Montaño ◽  
Mireille Vonlanthen ◽  
Ricardo D. Martínez-Serrano ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Photophysical Properties ◽  
Conjugated Systems ◽  
Donor Acceptor

Large π-Extension of Carbon Nanorings by Incorporating Hexa-peri-hexabenzocoronenes

Synlett ◽  
2017 ◽  
Vol 28 (14) ◽  
pp. 1671-1677 ◽  
Author(s):  
Dapeng Lu ◽  
Shengsheng Cui ◽  
Pingwu Du
Keyword(s):  
Photophysical Properties ◽  
Synthetic Methods ◽  
Conjugated Systems ◽  
Aromatization Reaction ◽  
Longitudinal Extension ◽  
Carbon Nanorings

Recently, we reported the synthesis of two novel large π-extended carbon nanorings by incorporating hexa-peri-hexabenzocoronenes: cyclo[12]-paraphenylene[2]-2,11-hexa-peri-hexabenzocoronene ([12,2]CPHBC) and the [4]cyclo-2,11-para-hexa-peri-hexabenzocoronene ([4]CHBC). The successful synthesis was achieved by the rationally designed pathways via palladium-, nickel-, or platinum-mediated reactions and the final aromatization reaction. This Synpacts article highlights the synthetic methods to achieve these carbon nanorings with large conjugated systems. We also summarize the representative characterization evidences and interesting photophysical properties of these carbon nanoring structures. Furthermore, the selective supramolecular host–guest interaction between [4]CHBC and C70 is briefly discussed. The new π-extended carbon nanorings can be considered as examples of longitudinal extension of the cycloparaphenylene scaffold, forming large conjugated CNT segments.1 Introduction2 Large π-Extended Carbon Nanorings by Incorporating Hexa-peri-hexabenzocoronenes3 Conclusions

scholarly journals Photophysical Properties and Electronic Structure of Symmetrical Curcumin Analogues and Their BF2 Complexes, Including a Phenothiazine Substituted Derivative

Symmetry ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2299
Author(s):  
Emese Gál ◽  
Levente Csaba Nagy
Keyword(s):  
Theoretical Study ◽  
Photophysical Properties ◽  
Emission Spectra ◽  
Molecular Structures ◽  
Excitation Energies ◽  
Dft Methods ◽  
Conjugated Systems ◽  
Vertical Excitation ◽  
Td Dft ◽  
The One

Symmetrically substituted curcumin analogue compounds possess electron donor moieties at both ends of the conjugated systems; their difluoroboron complexes were synthesized, and their structures were fully characterized. A novel compound with enhanced photophysical properties bearing phenothiazine moieties is reported. The introduction of BF2 into the molecular structures resulted in bathochromic shifts both in the absorption and emission spectra, indicating that the π-conjugation was more extended than the one in the initial compounds. The solvatochromic effects were studied, which in case of the phenothiazinyl-curcumin BF2 complex was the most notable. Theoretical study of the investigated compounds was carried out using DFT and TD-DFT methods to evaluate the ground state geometries and vertical excitation energies.

The relationship between photophysical properties and aromaticity/antiaromaticity of various expanded porphyrins — a Hans Fischer Career Award paper

2020 ◽  
Vol 24 (11n12) ◽  
pp. 1278-1299
Author(s):  
Jinseok Kim ◽  
Gakhyun Kim ◽  
Dongho Kim
Keyword(s):  
Molecular Conformation ◽  
Photophysical Properties ◽  
Molecular Properties ◽  
Conjugated Systems ◽  
Aromatic Molecules ◽  
Expanded Porphyrins ◽  
Real World Applications ◽  
The Relationship ◽  
Insight Into ◽  
Expanded Porphyrin

Understanding aromaticity is crucial for predicting the molecular properties and reactivity of cyclic [Formula: see text]-conjugated systems. In this review, representative reports on the evaluation of aromaticity via spectroscopic methods in various expanded porphyrin systems are presented. The relationship between the photophysical properties and distinct aromatic characteristics in Hückel aromatic compounds was revealed through notable spectroscopic features exhibited by aromatic expanded porphyrins. Furthermore, modulating the molecular conformation and chemical environment enabled us to distinguish unique Möbius aromatic molecules successfully. These findings provide insight into the elemental molecular properties and aromaticity in expanded porphyrin systems and their potential real-world applications.

Planar–rotor architecture based pyrene–vinyl–tetraphenylethylene conjugated systems: photophysical properties and aggregation behavior

2015 ◽  
Vol 13 (43) ◽  
pp. 10663-10674 ◽  
Author(s):  
Debabrata Jana ◽  
Shatabdi Boxi ◽  
Partha P. Parui ◽  
Binay K. Ghorai
Keyword(s):  
Electrochemical Properties ◽  
Photophysical Properties ◽  
Aggregation Behavior ◽  
Conjugated Systems

Pyrene–tetraphenylethylene based monomers and tetramers were synthesized. Photophysical and electrochemical properties were investigated. Spacer, architecture and substituent dependent aggregation behavior were reported.

Synthesis and Photophysical Properties of Fluorescein Esters as Potential Organic Semiconductor Materials

2021 ◽  
Author(s):  
Gamal A. E. Mostafa ◽  
Abu Syed Mahajumi ◽  
Haitham AlRabiah ◽  
Adnan A. Kadi ◽  
Yang Lu ◽  
...  
Keyword(s):  
Organic Semiconductor ◽  
Photophysical Properties ◽  
Semiconductor Materials ◽  
Organic Semiconductor Materials

Cathodoluminescence of Catalyst Crystallites

1982 ◽  
Vol 40 ◽  
pp. 664-665
Author(s):  
E.D. Boyes ◽  
P.L. Gai ◽  
D.B. Darby ◽  
C. Warwick
Keyword(s):  
Defect Density ◽  
Chemical Properties ◽  
Operating Conditions ◽  
Semiconductor Materials ◽  
Environmental Cell ◽  
High Resolution Structure ◽  
Commercially Important ◽  
Crystallographic Defects ◽  
Resolution Structure

The extended crystallographic defects introduced into some oxide catalysts under operating conditions may be a consequence and accommodation of the changes produced by the catalytic activity, rather than always being the origin of the reactivity. Operation without such defects has been established for the commercially important tellurium molybdate system. in addition it is clear that the point defect density and the electronic structure can both have a significant influence on the chemical properties and hence on the effectiveness (activity and selectivity) of the material as a catalyst. SEM/probe techniques more commonly applied to semiconductor materials, have been investigated to supplement the information obtained from in-situ environmental cell HVEM, ultra-high resolution structure imaging and more conventional AEM and EPMA chemical microanalysis.

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