Unusual fluorescent behavior of a heteroleptic Cu(I) complex featuring strong electron donating groups on the diimine ligand

2022 ◽  
Author(s):  
Mireya Santander-Nelli ◽  
Luis Sanhueza ◽  
Daniel Navas ◽  
Elena Rossin ◽  
Mirco Natali ◽  
...  
Keyword(s):  
Structural Properties ◽  
Strong Electron ◽  
Diimine Ligand ◽  
Electron Donating Groups

A novel diimine ligand (N^Nb) and the corresponding heteroleptic diimine-diphosphine Cu(I) complex (Cu-N^Nb) have been synthesized and their structural properties characterized. The N^Nb ligand is the 2,9-bis-[4-(dimethylamino)phenyl]ethenyl]-4,7-diphenyl-1,10-phenanthroline, which has a...

Spectroelectrochemical and ESR studies of highly substituted copper corroles

2004 ◽  
Vol 08 (10) ◽  
pp. 1236-1247 ◽  
Author(s):  
Zhongping Ou ◽  
Jianguo Shao ◽  
Hui Zhao ◽  
Kei Ohkubo ◽  
Ingar H. Wasbotten ◽  
...  
Keyword(s):  
Low Temperature ◽  
Thin Layer ◽  
Room Temperature ◽  
Strong Electron ◽  
Phenyl Rings ◽  
Uv Visible ◽  
Electron Donating Groups ◽  
Weak Electron

Electrochemical and spectroelectrochemical studies are presented for nine copper corroles with electron-withdrawing or electron-donating substituents on the three meso-phenyl rings of the compounds or on the eight β-pyrrole positions of the macrocycle. Up to three reversible oxidations can be seen for each Cu (III) corrole in CH 2 Cl 2 containing 0.1 M TBAP. Unlike the case of ( OEC ) Cu , no dimer is electrochemically detected upon the first oxidation of these compounds at room temperature. However, a dimer forms at low temperature (< -50°C) for compounds having strong electron-donating groups. Two reductions are observed for all nine corroles at low temperature in CH 2 Cl 2, 0.1 M TBAP, but only one reduction is detected at room temperature for four of these compounds which have weak electron-withdrawing or electron-donating groups. The neutral, reduced or oxidized Cu corroles were also characterized by thin-layer UV-visible spectroelectrochemistry and ESR. The resulting data indicates that eight of the nine neutral complexes contain a Cu (III) center while only one complex, [ Br 8( C 6 F 5)3 Cor ] Cu , exists in its Cu (II) form in CH 2 Cl 2 containing 0.2 M TBAP.

Copolymerization of norbornene and butyl methacrylate at elevated temperatures by a single centre nickel catalyst bearing bulky bis(α-diimine) ligand with strong electron-withdrawing groups

2017 ◽  
Vol 8 (15) ◽  
pp. 2390-2396 ◽  
Author(s):  
Xiaohui He ◽  
Yingjiao Deng ◽  
Xiong Jiang ◽  
Zijie Wang ◽  
Yingping Yang ◽  
...  
Keyword(s):  
Nickel Catalyst ◽  
Elevated Temperatures ◽  
Butyl Methacrylate ◽  
Single Centre ◽  
Strong Electron ◽  
Diimine Ligand ◽  
Electron Withdrawing Group

Bis(α-diimine) single nickel(ii) catalyst with strong electron-withdrawing group was applied to catalyze polymerization and copolymerization of norbornene and butyl methacrylate.

Nematic Liquid Crystals with High Positive Dielectric Anisotropy

1979 ◽  
Vol 34 (8) ◽  
pp. 1092-1095 ◽  
Author(s):  
Maged A. Osman
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Dielectric Anisotropy ◽  
Formyl Group ◽  
Schiff’S Base ◽  
Strong Electron ◽  
Nematic Phases ◽  
Electron Donating Groups

Alkylamino- and formyl alkylamino-cyano Schiff's base, biphenyl and phenylbenzoate liquid crystals were synthesized. The mesomorphic behaviour of these compounds is described. The introduction of the formyl group in the higher homologues lead to the disappearance of the mesophase. The alkylamino and formylalkylamino substituents are strong electron donating groups and lead to nematic phases with remarkably high positive dielectric anisotropy

scholarly journals Synthesis, Characterization and Anticonvulsant Potential of 2,5-Disubstituted 1,3,4-Oxadiazole Analogues

2019 ◽  
Vol 31 (6) ◽  
pp. 1389-1397
Author(s):  
RAJNISH KUMAR ◽  
MOHD. MUSTAQEEM ABDULLAH
Keyword(s):  
Animal Model ◽  
Phenyl Ring ◽  
Anticonvulsant Activity ◽  
Hydroxyl Group ◽  
Strong Electron ◽  
Locomotor Behaviour ◽  
Toxicology Study ◽  
Electron Donating Groups ◽  
Weak Electron

A new series of compounds in which benzimidazole, oxadiazole and quinoline were incorporated, was synthesized and investigated for their anticonvulsant activity. Some of the newly synthesized compounds have shown good anticonvulsant activity. Significant anticonvulsant potency of the prepared derivatives has been evaluated by minimal electroshock and subcutaneous pentylenetetrazole animal model methods. The structure of synthesized compounds indicated that the introduction of strong electron donating groups like methoxy, amino and hydroxyl group and weak electron withdrawing halogen at phenyl ring attached to 1,3,4-oxadiazole moiety causes improvement in anticonvulsant activity. Locomotor behaviour was evaluated by actophotometer and toxicology study was also performed to evaluate their significance as required anticonvulsant compounds.

Synthesis of near-infrared absorbing and fluorescing thiophene-fused BODIPY dyes with strong electron-donating groups and their application in dye-sensitised solar cells

2019 ◽  
Vol 43 (3) ◽  
pp. 1156-1165 ◽  
Author(s):  
Yasuhiro Kubota ◽  
Kosei Kimura ◽  
Jiye Jin ◽  
Kazuhiro Manseki ◽  
Kazumasa Funabiki ◽  
...  
Keyword(s):  
Solar Cells ◽  
Near Infrared ◽  
Strong Electron ◽  
Nir Absorption ◽  
Electron Donating Groups

Thiophene-fused BODIPY dyes with two diethylaminophenyl groups as strong donors demonstrated near-infrared (NIR) absorption (λmax: 783–812 nm, ε: 119 500–145 900) and fluorescence (Fmax: 862–916 nm, Φf: 0.02–0.12) in dichloromethane.

scholarly journals Exploration of donor effect on electron injection and photovoltaic properties of chalcone derivatives

2018 ◽  
Vol 36 (2) ◽  
pp. 276-282
Author(s):  
Ahmad Irfan
Keyword(s):  
Charge Transfer ◽  
Density Functional ◽  
Electron Injection ◽  
Band Alignment ◽  
Coupling Constants ◽  
Strong Electron ◽  
Photovoltaic Properties ◽  
Chalcone Derivatives ◽  
Reorganization Energies ◽  
Electron Donating Groups

Abstract Various photovoltaic parameters, i.e., electron injection (ΔGinject.), electronic coupling constants (|VRP|), light harvesting efficiencies (LHE), band alignment and electronic properties of five chalcone derivatives were studied by density functional theory (DFT) and time domain. The light was also shed on the effect of different electron donating groups and their strength intensity on the electronic and charge transfer properties. The balanced hole and electron reorganization energies for Comp 4 showed that it might have better ambipolar charge transfer in nature. The strong electron donating group(s) usually enhance(s) the ΔGinject. and |VRP| of chalcones as -N(CH3)2 > OCH3 > OH. Additionally, ΔGinject. and |VRP| of various substituted chalcone derivatives have been observed as trimethoxy > dimethoxy > monomethoxy. The greater electron donating ability of substituents is also favorable for the staggered band alignment. The superior ΔGinject. of all the studied chalcones than of the referenced compounds disclosed that the prior compounds would be proficient photovoltaic materials.

scholarly journals Theoretical Characterization of New Frustrated Lewis Pairs for Responsive Materials

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1573
Author(s):  
Maialen Galdeano ◽  
Fernando Ruipérez ◽  
Jon M. Matxain
Keyword(s):  
Advanced Materials ◽  
Frustrated Lewis Pairs ◽  
Strong Electron ◽  
Responsive Materials ◽  
New Material ◽  
Cross Links ◽  
Repulsive Forces ◽  
Diethyl Azodicarboxylate ◽  
Electron Donating Groups ◽  
Lewis Pairs

In recent years, responsive materials including dynamic bonds have been widely acclaimed due to their expectation to pilot advanced materials. Within these materials, synthetic polymers have shown to be good candidates. Recently, the so-called frustrated Lewis pairs (FLP) have been used to create responsive materials. Concretely, the activation of diethyl azodicarboxylate (DEAD) by a triphenylborane (TPB) and triphenylphosphine (TPP) based FLP has been recently exploited for the production of dynamic cross-links. In this work, we computationally explore the underlying dynamic chemistry in these materials, in order to understand the nature and reversibility of the interaction between the FLP and DEAD. With this goal in mind, we first characterize the acidity and basicity of several TPB and TPP derivatives using different substituents, such as electron-donating and electron-withdrawing groups. Our results show that strong electron-donating groups increase the acidity of TPB and decrease the basicity of TPP. However, the FLP–DEAD interaction is not mainly dominated by the influence of these substituents in the acidity or basicity of the TPB or TPP systems, but by attractive or repulsive forces between substituents such as hydrogen bonds or steric effects. Based on these results, a new material is proposed based on FLP–DEAD complexes.

Evidence for Strong Electron-Electron Correlations in (MTPP)1-x (MTPA)X (TCNQ)2

1982 ◽  
Vol 85 (1) ◽  
pp. 225-231
Author(s):  
G. Croteau ◽  
Amir Lakhani ◽  
N. K. Hota
Keyword(s):  
Electron Correlations ◽  
Strong Electron
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