scholarly journals Synthesis and Characterization of Metallo-Supramolecular Polymers Based on Benzodipyrrolidone

2021 ◽  
Vol 9 ◽  
Author(s):  
Zheng Chi ◽  
Hao Dong ◽  
Ganhui Shi ◽  
Pan Liu ◽  
Chenchen Ma ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Self Assembly ◽  
Energy Gap ◽  
Coupling Reaction ◽  
Building Blocks ◽  
Supramolecular Polymers ◽  
Absorption Bands ◽  
Suzuki Coupling Reaction ◽  
Ligand Charge Transfer ◽  
Common Precursor

A simple route to the preparation of benzodipyrrolidone (BDP) based monomeric building blocks containing 2,2′:6′,2″-terpyridines is reported from a common precursor 4′-(4-pinacolatoboronphenyl)-2,2′:6′,2″-terpyridine via Suzuki coupling reaction. Self-assembly polymerization with ruthenium (II) ions under mild conditions yielded a series of novel metallo-supramolecular polymers with weak donor-acceptor (D-A) structures based on benzodipyrrolidone. The structure of the bridge connected BDP with terpyridine have a significant impact on the wavelength and intensity of the intramolecular charge transfer (ICT) absorption peak. The resulting metallo-polymers exhibited strong double absorption bands around 315 nm and 510 nm involved in π-π* transitions and ICT or metal to ligand charge transfer (MLCT) absorption bands. The forming of D-A structure and coordination with ruthenium (II) ions is favorable to narrow the energy gap and the energy gaps of the resulting metallo-supramolecular polymers are 2.01 and 1.62 eV, respectively.

Synthesis of a new W-type of functional polymer for improving intermolecular charge transfer processes at donor/acceptor interfaces

2019 ◽  
Vol 31 (5) ◽  
pp. 521-527 ◽  
Author(s):  
Yun-Fan Zhang ◽  
Fawen Wu
Keyword(s):  
Charge Transfer ◽  
Energy Gap ◽  
Energy Levels ◽  
Coupling Reaction ◽  
Photocurrent Density ◽  
Orbital Energy ◽  
Functional Polymer ◽  
Suzuki Coupling Reaction ◽  
Donor Acceptor ◽  
Lowest Unoccupied Molecular Orbital

Optimizing charge transfer (CT) processes at donor/acceptor interfaces is an important subject to improving photocurrent density. Geometries of functional polymers play important roles in design of new types of polymers, which were used as electron donor to improve effective separation of electron-hole pairs at donor/acceptor interfaces. In this article, a novel W-type of polymer, poly(1-[4-(9-(2-ethylhexyl)carbazole-3-yl)]phenylazo-2-phenylazoacenaphthylene), was synthesized by a Suzuki coupling reaction for improving interaction between polymers and electron acceptors to enhance intermolecular CT. Geometry of combination of the polymer and C60 shows that main-chain of the polymer could sufficiently touch C60 derivatives. The polymer exhibited a broadband light absorption at the wavelength range from 250 to 650 nm. Ultraviolet–visible spectra and cyclic voltammetry curve suggest that the highest occupied, lowest unoccupied molecular orbital energy levels, and energy gap values are −5.09, −3.18 and 1.91 eV. Fluorescence quenching experiments shows that 99.9% of emission fluorescence of the polymer was quenched by added C60. Therefore, excited electrons at the polymer would be completely transferred to C60 molecules. This article suggests a new W-type functional polymer for improving intermolecular CT processes at donor/acceptor interfaces.

Orthogonal self-assembly of stimuli-responsive supramolecular polymers using one-step prepared heterotelechelic building blocks

2013 ◽  
Vol 4 (1) ◽  
pp. 113-123 ◽  
Author(s):  
Ulrich Mansfeld ◽  
Andreas Winter ◽  
Martin D. Hager ◽  
Richard Hoogenboom ◽  
Wolfgang Günther ◽  
...  
Keyword(s):  
Self Assembly ◽  
Building Blocks ◽  
Supramolecular Polymers ◽  
Stimuli Responsive ◽  
One Step

scholarly journals Synthesis and application of a new class of D–π–A type charge transfer probe containing imidazole – naphthalene units for detection of F− and CO2

RSC Advances ◽  
2017 ◽  
Vol 7 (9) ◽  
pp. 4941-4949 ◽  
Author(s):  
Ramesh C. Gupta ◽  
Rashid Ali ◽  
Syed S. Razi ◽  
Priyanka Srivastava ◽  
Sushil K. Dwivedi ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Coupling Reaction ◽  
Suzuki Coupling ◽  
Suzuki Coupling Reaction ◽  
New Class ◽  
Donor And Acceptor

A new class of D–π–A type charge transfer probe, 3 and 4, containing imidazole – naphthalene moieties as donor and acceptor, respectively, has been synthesized via a Suzuki coupling reaction.

scholarly journals DNA–melamine hybrid molecules: from self-assembly to nanostructures

2015 ◽  
Vol 6 ◽  
pp. 1432-1438 ◽  
Author(s):  
Rina Kumari ◽  
Shib Shankar Banerjee ◽  
Anil K Bhowmick ◽  
Prolay Das
Keyword(s):  
Self Assembly ◽  
Coupling Reaction ◽  
Building Blocks ◽  
The Self ◽  
Organic Hybrid ◽  
Molecular Building Blocks ◽  
Cross Coupling Reaction ◽  
Linear Chains ◽  
Hybrid Molecules ◽  
Dna Strands

Single-stranded DNA–melamine hybrid molecular building blocks were synthesized using a phosphoramidation cross-coupling reaction with a zero linker approach. The self-assembly of the DNA–organic hybrid molecules was achieved by DNA hybridization. Following self-assembly, two distinct types of nanostructures in the form of linear chains and network arrays were observed. The morphology of the self-assembled nanostructures was found to depend on the number of DNA strands that were attached to a single melamine molecule.

A self-assembly induced emission system constructed by the host–guest interaction of AIE-active building blocks

2015 ◽  
Vol 51 (6) ◽  
pp. 1089-1091 ◽  
Author(s):  
Wei Bai ◽  
Zhaoyang Wang ◽  
Jiaqi Tong ◽  
Ju Mei ◽  
Anjun Qin ◽  
...  
Keyword(s):  
Self Assembly ◽  
Building Blocks ◽  
Supramolecular Polymers ◽  
Acid Base ◽  
Aggregation Induced Emission ◽  
Emission System

Benzylamine (guest) and dibenzo[24]crown-8 (host) modified tetraphenylethenes (AIE-gens) are prepared and used to construct supramolecular polymers exhibiting the merits of reversible assembling–disassembling and tunable aggregation-induced emission by acid–base treatments.

Orange Electrophosphorescence of 2-(9, 9-Diethylfluoren-2-yl)-5- Trifluoromethylpyridine Iridium Complex

2013 ◽  
Vol 785-786 ◽  
pp. 624-627
Author(s):  
Wen Guan Zhang ◽  
Hui Pang ◽  
Sheng Min Zhao
Keyword(s):  
Charge Transfer ◽  
Emission Spectrum ◽  
Uv Absorption ◽  
Iridium Complex ◽  
Absorption Bands ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Ligand Charge Transfer ◽  
Luminescent Spectra

Emission spectrum of Iridium complex bis [2-(9, 9-diethylfluoren-2-yl)-5-trifluoromethyl-pyridinto-C3, iridium (acetylacetonate) (fl-5CF3-py)2Ir (acac) in THF was 589 nm. Two weak UV absorption bands can be assigned to spin-allowed singlet metal-to-ligand charge transfer (1MLCT) and spin-forbidden 3MLCT transitions. The organic light-emitting devices A ITO/PEDOT: PSS/PBD: PVK: (fl-5CF3-py)2Ir (acac) (8 %) /LiF/Al and B ITO/PEDOT:PSS/PBD: PVK: (fl-5CF3-py)2Ir (acac) (8 %) /TPBi/LiF/Al were fabricated using iridium complex as emitter dopant with electro-luminescent spectra at 592 and 588 nm at the bias voltages of 9, 11 and 13V. Devices A and B exhibited luminance of 5265 (at 15 V) and 4098 cd/m2 with Commission International de LEclairage (CIE) coordinates of (0.5805, 0.4185) and (0.5815, 0.4176), respectively. Device B (with TPBi) emitted orange light more efficiently than Device A (without TPBi).

Tuning Color of Charged Iridium (III) Complexes with a Spiro N,N'-Bidentate Ligand

2012 ◽  
Vol 229-231 ◽  
pp. 192-196 ◽  
Author(s):  
Kattaliya Mothajit ◽  
Kittiya Wongkhan ◽  
Rukkiat Jitchati
Keyword(s):  
Charge Transfer ◽  
Photophysical Properties ◽  
Bidentate Ligand ◽  
Organic Light Emitting Diodes ◽  
Photoluminescence Spectra ◽  
Absorption Bands ◽  
Light Emitting ◽  
Organic Light ◽  
Ligand Charge Transfer ◽  
Emission Color

Organic light emitting diodes (OLEDs), charged iridium(III) complexes, spiro ligand Abstract. We report the synthesis, characterization and photophysical properties of a cationic cyclometalated Ir(III) complexes of general formula [Ir(ppy)2(spbpy)]+Cl, [Ir(diFppy)2(spbpy)]+Cland [Ir(thiopy)2(spbpy)]+Clwhere ppy, spbpy, diFppy and thiopy are 2-phenylpyridine, 4,5-diaza-9,9′-spirobifluorene, 2-(2′,4′-difluorophenyl)-pyridine and 2-(thiophen-2′-yl)-pyridine, respectively. The complexes exhibit strong absorption bands in the UV region in solution spectra, due to spin-allowed ligand-centred (LC) and weaker absorption bands at longer wavelengths from metal-to-ligand charge transfer (MLCT). The photoluminescence spectra of all the complexes were characterised by a combination of 3MLCT and3π→π*states. The emission color of a cationic cyclometalated Ir(III) complexes in solution have successfully tuned from green to orange (501-582 nm).

[Ru(bpy)3]2+* and other remarkable metal-to-ligand charge transfer (MLCT) excited states

2013 ◽  
Vol 85 (7) ◽  
pp. 1257-1305 ◽  
Author(s):  
David W. Thompson ◽  
Akitaka Ito ◽  
Thomas J. Meyer
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Energy Gap ◽  
Hybrid Approach ◽  
Medium Effects ◽  
New Approach ◽  
Dye Sensitized ◽  
Ligand Charge Transfer ◽  
Energy Gap Law

In 1974, the metal-to-ligand charge transfer (MLCT) excited state, [Ru(bpy)3]2+*, was shown to undergo electron transfer quenching by methylviologen dication (MV2+), inspiring a new approach to artificial photosynthesis based on molecules, molecular-level phenomena, and a “modular approach”. In the intervening years, application of synthesis, excited-state measurements, and theory to [Ru(bpy)3]2+* and its relatives has had an outsized impact on photochemistry and photophysics. They have provided a basis for exploring the energy gap law for nonradiative decay and the role of molecular vibrations and solvent and medium effects on excited-state properties. Much has been learned about light absorption, excited-state electronic and molecular structure, and excited-state dynamics on timescales from femtoseconds to milliseconds. Excited-state properties and reactivity have been exploited in the investigation of electron and energy transfer in solution, in molecular assemblies, and in derivatized polymers and oligoprolines. An integrated, hybrid approach to solar fuels, based on dye-sensitized photoelectrosynthesis cells (DSPECs), has emerged and is being actively investigated.

Fluorescent Supramolecular Polymers:  Metal Directed Self-Assembly of Perylene Bisimide Building Blocks

2005 ◽  
Vol 38 (4) ◽  
pp. 1315-1325 ◽  
Author(s):  
Rainer Dobrawa ◽  
Marina Lysetska ◽  
Pablo Ballester ◽  
Matthias Grüne ◽  
Frank Würthner
Keyword(s):  
Self Assembly ◽  
Building Blocks ◽  
Supramolecular Polymers ◽  
Perylene Bisimide

C, Si, Ge AND Sn SURFACE DOPING OF WURTZITE AlN NANOCRYSTALS: Ab INITIO STUDY USING WURTZOIDS STRUCTURES

2018 ◽  
Vol 25 (07) ◽  
pp. 1950015 ◽  
Author(s):  
MUDAR AHMED ABDULSATTAR ◽  
ASEEL MUHAMMEDNOORI ABDULSAHIB ◽  
NOORULDEEN MUDHER ALMAROOF ◽  
NAZAR MUDHER ALMAROOF ◽  
ALI SADIQ ALRUBAI
Keyword(s):  
Charge Transfer ◽  
Carbon Atom ◽  
Energy Gap ◽  
Atomic Charge ◽  
Building Blocks ◽  
Longitudinal Optical ◽  
Group Iv ◽  
Surface Doping ◽  
Molecular Building Blocks ◽  
Group Iv Elements

Wurtzite nanostructures have been recently described using molecular building blocks called wurtzoids. These wurtzoids are utilized in the present work to describe aluminum mononitride (AlN) nanostructures including its surface doping with group IV elements i.e. C Si, Ge and Sn. Calculations are performed for bare, and hydrogen surface passivated wurtzoids. Results show that hydrogen-passivated (HP) AlN-wurtzoids have energy gaps that are very near to the experimental bulk AlN. Longitudinal optical (LO) vibrational frequencies are also very near to bulk experimental value with blue and red frequency shifting for bare, and hydrogen surface passivated wurtzoids. Doped AlN-wurtzoid2c with group IV elements show a reduction of the energy gap. The gap generally decreases as the atomic number of the dopant increases. The electronic and vibrational properties can be interpreted using the charge transfer between atoms. Minimum atomic charge transfer is for carbon atom doping that leads to a maximum reduction of the energy gap of bare and entirely hydrogen surface passivated wurtzoids. The doped carbon atom charge transfer also induces the highest increase in LO vibrational mode.

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