scholarly journals Imidazo-Phenanthroline Ligands as a Convenient Modular Platform for the Preparation of Heteroleptic Cu(I) Photosensitizers

Inorganics ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 134 ◽  
Author(s):  
Marie-Ann Schmid ◽  
Martin Rentschler ◽  
Wolfgang Frey ◽  
Stefanie Tschierlei ◽  
Michael Karnahl
Keyword(s):  
Essential Feature ◽  
Photophysical Properties ◽  
Diimine Ligands ◽  
Starting Point ◽  
Diimine Ligand ◽  
Modular Platform ◽  
20 Nm ◽  
And Storage ◽  
Current Energy ◽  
Bright Emission

The capture and storage of solar energy is a promising option to overcome current energy issues. To put such systems into practice, molecular photosensitizers should be based on abundant metals and possess a strong absorption capability for visible light. Therefore, a systematic series of four novel heteroleptic Cu(I) complexes of the type [(P^P)Cu(N^N)]+ (with P^P = xantphos and N^N = different diimine ligands) has been prepared. As an essential feature, these copper photosensitizers contain an imidazole moiety at the backbone of the diimine ligand, which increases the aromatic π-system compared to phenanthroline type ligands. Moreover, 2-(4-bromophenyl)-1-phenyl-1H-imidazo-[4,5-f][1,10]phenanthroline was used as a starting point and modular platform for gradually extended diimine ligands. Suzuki cross-coupling was applied to introduce different kind of substituents in the back of this ligand. Afterwards, a combination of NMR spectroscopy, mass spectrometry, X-ray analysis, cyclic voltammetry, UV/vis and emission spectroscopy was used to investigate the structural, electrochemical and photophysical properties of these compounds. As a result, a reversible reduction, strongly increased extinction coefficients and significantly redshifted absorption maxima (>20 nm) were found compared to traditional Cu(I) photosensitizers without an imidazo moiety. Moreover, these compounds show a bright emission in the solid state.

‘More, bigger, better’ household appliances: Contesting normativity in practices through emotions

2019 ◽  
pp. 146954051988998 ◽  
Author(s):  
Marlyne Sahakian
Keyword(s):  
Positive Emotions ◽  
Household Appliances ◽  
Complementary Methods ◽  
Meal Preparation ◽  
Normative Authority ◽  
Space And Time ◽  
Starting Point ◽  
Bounded Space ◽  
Heuristic Device ◽  
And Storage

With electricity-using appliances as the starting point, we seek to uncover the normative authority in the performance of practices among households in Western Switzerland. Through complementary methods, we explore normativity in practices that involve communicating and entertaining, cleaning and tidying up, and storing food and preparing meals. Combined with this approach is an understanding of emotions in practice, which are used as a heuristic device for uncovering how people performing practices feel that they are either aligned with how things ought or should be done, or conversely reveal any tensions in relation to the explicit or implicit normative authority. We see these points of tension as opportunities for change in designing experiments in a bounded space and time where practices can be performed differently – towards disconnecting, washing less, or sharing meal preparation and storage, for example. We conclude with discussions on the importance of enacting ‘deviant’ practices as performances and staging positive emotions, towards finding coherent ways to challenge the normative authority tied up with practices that rely on ‘more, bigger, better’ household appliances.

Comparison of Physical and Photophysical Properties of Monometallic and Bimetallic Ruthenium(II) Complexes Containing Structurally Altered Diimine Ligands

1996 ◽  
Vol 35 (23) ◽  
pp. 6823-6831 ◽  
Author(s):  
Ariel Macatangay ◽  
Greg Y. Zheng ◽  
D. Paul Rillema ◽  
Donald C. Jackman ◽  
Jon W. Merkert
Keyword(s):  
Photophysical Properties ◽  
Diimine Ligands

Synthesis, Characterization, and Luminescent Properties of a Red-Emitting Europium Complex

2012 ◽  
Vol 512-515 ◽  
pp. 1771-1775
Author(s):  
Li Ying Zhang ◽  
Bin Li ◽  
Gang Lv
Keyword(s):  
Photophysical Properties ◽  
Luminescent Properties ◽  
Europium Complex ◽  
Maximum Efficiency ◽  
Red Emission ◽  
Phenanthroline Ligand ◽  
Organic Devices ◽  
20 Nm

a fluorine functionalized 1,10-phenanthroline ligand, 3-ethyl-2-(2-fluorophenyl) imidazo[4,5-f]1,10-phenanthroline(EFPIP) and the corresponding red-emitting Eu(ΙΙΙ) complex Eu(DBM)3(EFPIP) (DBM = dibenzoylmethanate) was synthesized and the photophysical properties and electroluminescent(EL) performances were researched. When Eu(DBM)3(EFPIP) was used as emitting material in organic devices, the maximum efficiency and luminance of red emission achieved from the EL device with the configuration of ITO/m-MTDATA (30 nm)/NPB (20 nm)/ x wt% Eu(DBM)3(EFPIP) doped in CBP (30 nm)/Bphen (20 nm)/Alq3 (20 nm)/LiF (0.8 nm)/Al were 3.6 cd/A and 563 cd/m2, respectively. Compared with the previously reported devices based on methyl or chlorine substitute Eu(ΙΙΙ) complexes, the EL performances of the device using Eu(DBM)3(EFPIP) as an emitter was significantly enhanced due to the introduction of fluorine.

scholarly journals Re(I) Complexes as Backbone Substituents and Cross-Linking Agents for Hybrid Luminescent Polysiloxanes and Silicone Rubbers

Molecules ◽  
2021 ◽  
Vol 26 (22) ◽  
pp. 6866
Author(s):  
Egor M. Baranovskii ◽  
Victoria V. Khistiaeva ◽  
Konstantin V. Deriabin ◽  
Stanislav K. Petrovskii ◽  
Igor O. Koshevoy ◽  
...  
Keyword(s):  
Click Reaction ◽  
Photophysical Properties ◽  
Polymer Materials ◽  
Cross Linking ◽  
Hybrid Polymer ◽  
Luminescent Center ◽  
Emission Profile ◽  
Diimine Ligand ◽  
Reaction Capability ◽  
Silicone Rubbers

This study focuses on the synthesis of hybrid luminescent polysiloxanes and silicone rubbers grafted by organometallic rhenium(I) complexes using Cu(I)-catalyzed azido-alkyne cycloaddition (CuAAC). The design of the rhenium(I) complexes includes using a diimine ligand to create an MLCT luminescent center and the introduction of a triple C≡C bond on the periphery of the ligand environment to provide click-reaction capability. Poly(3-azidopropylmethylsiloxane-co-dimethylsiloxane) (N3-PDMS) was synthesized for incorporation of azide function in polysiloxane chain. [Re(CO)3(MeCN)(5-(4-ethynylphenyl)-2,2′-bipyridine)]OTf (Re1) luminescent complex was used to prepare a luminescent copolymer with N3-PDMS (Re1-PDMS), while [Re(CO)3Cl(5,5′-diethynyl-2,2′-bipyridine)] (Re2) was used as a luminescent cross-linking agent of N3-PDMS to obtain luminescent silicone rubber (Re2-PDMS). The examination of photophysical properties of the hybrid polymer materials obtained show that emission profile of Re(I) moiety remains unchanged and metallocenter allows to control the creation of polysiloxane-based materials with specified properties.

scholarly journals Chimera Diimine Ligands in Emissive [Cu(P^P)(N^N)][PF6] Complexes

Inorganics ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 33 ◽  
Author(s):  
Marco Meyer ◽  
Fabian Brunner ◽  
Alessandro Prescimone ◽  
Edwin C. Constable ◽  
Catherine E. Housecroft
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Photophysical Properties ◽  
Phenyl Ether ◽  
Steric Effects ◽  
Single Crystal Structures ◽  
Diimine Ligands ◽  
Chelating Ligand ◽  
Tetrahedral Environment ◽  
Related Compounds

The syntheses and characterizations of the chelating ligand 6-chloro-6′-methyl-2,2′-bipyridine (6-Cl-6′-Mebpy) and of the copper(I) compounds [Cu(POP)(6-Cl-6′-Mebpy)][PF6] and [Cu(xantphos)(6-Cl-6′-Mebpy)][PF6] (POP = bis(2-(diphenylphosphanyl)phenyl)ether and xantphos = 4,5-bis(diphenylphosphanyl)-9,9-dimethyl-9H-xanthene) are described. The single crystal structures of both complexes were determined; the copper(I) ion is in a distorted tetrahedral environment and in [Cu(xantphos)(6-Cl-6′-Mebpy)][PF6], the disorder of the 6-Cl-6′-Mebpy ligand indicates there is no preference of the ‘bowl’-like cavity of the xanthene unit to host either the methyl or chloro-substituent, consistent with comparable steric effects of the two groups. The electrochemical and photophysical properties of [Cu(POP)(6-Cl-6′-Mebpy)][PF6] and [Cu(xantphos)(6-Cl-6′-Mebpy)][PF6] were investigated and are compared with those of the related compounds containing 6,6′-dichloro-2,2′-bipyridine or 6,6′-dimethyl-2,2′-bipyridine ligands. Trends in properties of the [Cu(P^P)(N^N)]+ complexes were consistent with 6-Cl-6′-Mebpy behaving as a combination of the two parent ligands.

Synthesis and structures of mononuclear and dinuclear gallium complexes with α-diimine ligands: reduction of the metal or ligand?

2016 ◽  
Vol 45 (1) ◽  
pp. 246-252 ◽  
Author(s):  
Yanxia Zhao ◽  
Yanyan Liu ◽  
Qian-Shu Li ◽  
Ji-Hu Su
Keyword(s):  
Oxidation State ◽  
Oxidation States ◽  
Lower Oxidation State ◽  
Diimine Ligands ◽  
Diimine Ligand ◽  
Dianionic Ligands ◽  
Lower Oxidation ◽  
Gallium Complexes

A series of gallium complexes with different oxidation states of ligand and metal were obtained, both monoanionic and dianionic ligands can be further reduced, where reduction of the radical monoanionic α-diimine ligand into dianion or of Ga (+3) into the lower oxidation state Ga (+2) or Ga (+1.5) takes place.

Dynamic impact of Diamond Light Source foot bridge

2010 ◽  
Vol 1 (MEDSI-6) ◽  
Author(s):  
H. Huang ◽  
J. Kay
Keyword(s):  
Light Source ◽  
Storage Ring ◽  
Ring Structure ◽  
Dynamic Impact ◽  
Human Foot ◽  
Pedestrian Traffic ◽  
Vibration Tests ◽  
20 Nm ◽  
The Impact ◽  
And Storage

The main foot bridge provides access to linac, booster and storage ring facilities in the synchrotron of Diamond Light Source. The impact of the passage of pedestrian traffic and equipment across the bridge structure was noticeable to the site of beamlines below. One of them, I20, is the most sensitive beamline to such impact. The bridge obviously oscillated with even light traffic, and it was also assumed that this would couple to the storage ring structure where the bridge is mounted. The optics for beamline I20, for stability, stands directly on the slab within the I20 experimental area; this was however subject to excessive vibration transmitted by foot traffic from the overhead footbridge producing a vibration on the experimental floor of 86 nm whereas elsewhere in the experimental hall experiences only about 20 nm, demonstrating a four times increase in vibration caused by the pedestrian bridge. Vibration measurements on the ground underneath the bridge and finite element analyses clearly show that frequencies of 2 and 5 Hz were caused by the bridge and traffic on it. Several remedies were proposed. However, dampers will only damp out vibrations of around 5–6 Hz but not to damp out 2 Hz, which is caused directly by human foot steps. After investigation of cost and effectiveness and several vibration tests conducted, a compromise with extra propping at the mid-span of the bridge was eventually selected. Such reinforcement has been now implemented. The 5 Hz frequency has been successfully removed and a amplitude of 2 Hz also considerably reduced.

Photophysical Properties of Platinum(II)−Acetylide Complexes: the Effect of a Strongly Electron-Accepting Diimine Ligand on Excited-State Structure

2008 ◽  
Vol 47 (18) ◽  
pp. 8242-8257 ◽  
Author(s):  
Christopher J. Adams ◽  
Natalie Fey ◽  
Zoë A. Harrison ◽  
Igor V. Sazanovich ◽  
Michael Towrie ◽  
...  
Keyword(s):  
Excited State ◽  
Photophysical Properties ◽  
State Structure ◽  
Diimine Ligand

Synthesis, Characterization and Photophysical Properties of Thiophene-Containing Chloro Re(I) Complex

2010 ◽  
Vol 146-147 ◽  
pp. 869-872
Author(s):  
Jie Xiu Wang ◽  
Feng Zhao
Keyword(s):  
Charge Transfer ◽  
Electron Density ◽  
1H Nmr ◽  
Photophysical Properties ◽  
Red Shift ◽  
Rhenium Complexes ◽  
Diimine Ligands ◽  
Ligand Charge Transfer

Two tricarbonyl rhenium complexes with the formula of [Re(CO)3(L)Cl], where L=1,10-phenanthroline (Phen-Re) and 2-(3-thienyl)-imidazo[4,5-f]-1,10-phenanthroline (TIPh-Re), were successfully synthesized and characterized by 1H NMR and UV–Vis with the aim to analyze the effect of the thiophene(TI) moiety on the photophysical properties of TIPh-Re. It was found that the introduction of an π-electron density moiety into diimine ligands leads to a dramatic red shift of the absorption of the corresponding Re(I) complex. At the same time, the results verify that the triplet metal-to-ligand charge-transfer dπ(Re)→π*(N-N) emission (3MLCT) of Phen-Re and TIPh-Re centered at ca. 566 nm and ca.569 nm, respectively.

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