[FeFe]-hydrogenase H-cluster mimics mediated by mixed (S, Se) and (S, Te) bridging moieties: Insight into molecular structures and electrochemical characteristics

2018 ◽  
Vol 29 (5-6) ◽  
pp. e21446 ◽  
Author(s):  
Hassan Abul-Futouh ◽  
Mohammad El-khateeb ◽  
Helmar Görls ◽  
Wolfgang Weigand
Keyword(s):  
Molecular Structures ◽  
Electrochemical Characteristics ◽  
Insight Into

Toward a Tunable Synthetic [FeFe]-Hydrogenase H-Cluster Mimic Mediated by Perylene Monoimide Model Complexes: Insight into Molecular Structures and Electrochemical Characteristics

2018 ◽  
Vol 37 (19) ◽  
pp. 3278-3285 ◽  
Author(s):  
Hassan Abul-Futouh ◽  
Artem Skabeev ◽  
Davide Botteri ◽  
Yulian Zagranyarski ◽  
Helmar Görls ◽  
...  
Keyword(s):  
Molecular Structures ◽  
Electrochemical Characteristics ◽  
Model Complexes ◽  
Insight Into

scholarly journals Discoloration of Historical Plastic Objects: New Insight into the Degradation of β-Naphthol Pigment Lakes

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2278
Author(s):  
Anna Micheluz ◽  
Eva Mariasole Angelin ◽  
João Almeida Lopes ◽  
Maria João Melo ◽  
Marisa Pamplona
Keyword(s):  
Light Exposure ◽  
Molecular Structures ◽  
Conservation Science ◽  
Organic Pigment ◽  
Organic Pigments ◽  
Before And After ◽  
The Individual ◽  
Determining Factor ◽  
Insight Into ◽  
Historical Samples

Light is a determining factor in the discoloration of plastics, and photodegradation processes can affect the molecular structures of both the polymer and colorants. Limited studies focused on the discoloration of heritage plastics in conservation science. This work investigated the discoloration of red historical polyethylene (PE) objects colored with PR 48:2 and PR 53:1. High-density and low-density PE reference polymers, neat pigment powders, and historical samples were assessed before and after accelerated photoaging. The applied methodology provided insight into the individual light-susceptibility of polyethylenes, organic pigment lakes, and their combined effect in the photoaging of historical plastic formulations. After light exposure, both PE references and historical samples yellowed, PR53:1 faded, and PR 48:2 darkened; however, both organic pigments faded severely in the historical samples. This highlights the role played by the plastic binder likely facilitating the pigment photofading. Fourier transform infrared spectroscopy and mass spectrometry techniques—EGA-MS, PY-GC/MS, and TD-GC/MS—were successfully employed for characterizing the plastic formulations and degradation. The identification of phthalic compounds in both aged β-naphthol powders opens new venues for studies on their degradation. This work’s approach and analytical methods in studying the discoloration of historical plastics are novel, proving their efficacy, reliability, and potentiality.

LIGHT-INDUCED MODIFICATION OF KINETIC MOLECULAR PROPERTIES: ENHANCEMENT OF OPTICAL KERR EFFECT IN ABSORBING LIQUIDS, PHOTOINDUCED TORQUE AND MOLECULAR MOTORS IN DYE-DOPED NEMATICS

2000 ◽  
Vol 09 (02) ◽  
pp. 157-182 ◽  
Author(s):  
M. KREUZER ◽  
L. MARRUCCI ◽  
D. PAPARO
Keyword(s):  
Liquid Crystals ◽  
Molecular Motors ◽  
Kerr Effect ◽  
Optical Nonlinearity ◽  
Molecular Structures ◽  
Molecular Properties ◽  
Main Role ◽  
Theoretical Results ◽  
Insight Into ◽  
Dye Molecule

In this paper we review some experimental and theoretical results on the enhancement of orientational optical nonlinearities observed in dye-doped liquids and liquid crystals. We argue that this enhancement is derived from a photoinduced modification of kinetic molecular properties. Moreover we highlight an analogy between the mechanism of this effect in nematic liquid crystals and the working principles of "molecular motors". This analogy helps us to refine the understanding of this effect and to identify the molecular parameters which play the main role. Finally we review some recent experimental results about the dependence of the optical nonlinearity enhancement on the detailed dye and host molecular structures. These results provide some insight into the light-induced phenomena taking place inside a dye molecule.

Silicon-Heteroaromatic [FeFe] Hydrogenase Model Complexes: Insight into Protonation, Electrochemical Properties, and Molecular Structures

2015 ◽  
Vol 21 (13) ◽  
pp. 5061-5073 ◽  
Author(s):  
Roman Goy ◽  
Luca Bertini ◽  
Helmar Görls ◽  
Luca De Gioia ◽  
Jean Talarmin ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Molecular Structures ◽  
Model Complexes ◽  
Insight Into

An insight into the retrogradation behaviors and molecular structures of lotus seed starch-hydrocolloid blends

2019 ◽  
Vol 295 ◽  
pp. 548-555 ◽  
Author(s):  
Mingjing Zheng ◽  
Han Su ◽  
Qingxiang You ◽  
Shaoxiao Zeng ◽  
Baodong Zheng ◽  
...  
Keyword(s):  
Molecular Structures ◽  
Lotus Seed ◽  
Insight Into

Densely Cross-Linked Polysiloxane Nanogels

INEOS OPEN ◽  
2020 ◽  
Vol 3 ◽  
Author(s):  
I. B. Meshkov ◽  
◽  
A. A. Kalinina ◽  
V. V. Kazakova ◽  
A. I. Demchenko ◽  
...  
Keyword(s):  
Molecular Design ◽  
Molecular Structures ◽  
Polymer Chemistry ◽  
Controlled Synthesis ◽  
Current Review ◽  
Synthetic Routes ◽  
Per Se ◽  
Further Development ◽  
Insight Into ◽  
Application Scope

Nanogels can be called the new old§ objects of polymer chemistry. New because we have formulated the criteria for the assignment of objects to this group within the macromolecule-particle concept and developed the methods for their directed and controlled synthesis. Old because the application of these criteria to the earlier known systems allow us to surely classify them as nanogels. It is shown that this classification per se provides insight into the organization of their molecular structures and enables directed modification. This means a transition from the empirical control of the properties to molecular design. The current review presents a brief historical overview of densely cross-linked nanogels and their main synthetic routes and highlights the principles and approaches to the control of their structures and molecular-mass characteristics, application scope, and prospects for further development.

scholarly journals Insight into the Synthesis and Characterization of Organophosphorus-Based Bridged Triazine Compounds

Molecules ◽  
2019 ◽  
Vol 24 (14) ◽  
pp. 2672 ◽  
Author(s):  
Khalifah A. Salmeia ◽  
Antonia Neels ◽  
Dambarudhar Parida ◽  
Sandro Lehner ◽  
Daniel Rentsch ◽  
...  
Keyword(s):  
Gas Phase ◽  
Organophosphorus Compounds ◽  
Triethyl Phosphite ◽  
Molecular Structures ◽  
Composition Analysis ◽  
Char Formation ◽  
Flame Inhibition ◽  
High Yields ◽  
Insight Into

In this article, we report the synthesis of 2,4,6-substituted s-triazine-based organophosphorus compounds via a two-step process, which enables their production in high yields, and with a high purity as solids. In the first step, a Michaelis–Arbuzov rearrangement of cyanuric chloride with triethyl phosphite afforded 2,4,6-trisdiethoxyphosphinyl-1,3,5-triazine (HEPT). Subsequently, the nucleophilic substitution reaction on the triazine carbon was achieved, owing to the electron-withdrawing ability of the phosphonate groups. This characteristic of HEPT facilitated its derivatization with bi-functional amines, producing novel P–C containing bridged triazine organophosphorus compounds. The molecular structures of all of the compounds were confirmed by NMR spectroscopy, CHN elemental analysis, and single crystal X-ray analysis. In the thermogravimetric analysis in an N2 environment, >33% char formation was observed for the bridged compounds. The chemical composition analysis of the char obtained under the oxidative thermal decomposition of the bridged compounds confirmed the presence of phosphorus- and nitrogen-enriched species, which indicate their function in the condensed phase. Comparatively, the detection of HPO and H–C≡P in the gas phase during the pyrolysis of the bridged compounds can act as a source for PO•, which is known for its gas phase flame inhibition reactions. The synergy of significant char formation and the generation of intermediates leading to PO• during pyrolysis makes these molecules promising flame-retardant additives.

An insight into the molecular structures, theoretical calculation and catalytic activities of novel heterotrinuclear [CuII2CeIII] and heterohexanuclear [CuII4YIII2] bis(salamo)-based complexes

2020 ◽  
Vol 44 (45) ◽  
pp. 19836-19849
Author(s):  
Zhuang-Zhuang Chen ◽  
Wen-Ze Zhang ◽  
Ting Zhang ◽  
Yang Zhang ◽  
Wen-Kui Dong
Keyword(s):  
Catalytic Activity ◽  
Theoretical Calculation ◽  
Molecular Structures ◽  
Catalytic Activities ◽  
Heteropolynuclear Complexes ◽  
Insight Into

Two heteropolynuclear complexes, [CuII2CeIII] [Cu2(L)Ce(NO3)3] and [{Cu2(L)Y(NO3)2(μ-AcO)}{Cu2(L)Y(NO3)2(μ-NO3)(CH3OH)}]·4CH3OH, were synthesized. It was found that only the [CuII2CeIII] complex showed high catecholase and benzoxazinone synthase like catalytic activity.

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