scholarly journals Towards 2D layered hybrid perovskites with enhanced functionality: introducing charge-transfer complexes via self-assembly

2019 ◽  
Vol 55 (17) ◽  
pp. 2481-2484 ◽  
Author(s):  
Wouter T. M. Van Gompel ◽  
Roald Herckens ◽  
Kristof Van Hecke ◽  
Bart Ruttens ◽  
Jan D'Haen ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Self Assembly ◽  
The Self ◽  
Charge Transfer Complexes ◽  
Organic Layer ◽  
The Family ◽  
Layered Perovskites

This study broadens the family of 2D layered perovskites by the self-assembly of organic charge-transfer complexes in their organic layer.

Self-Assembly of Alkali Lignin in Tetrahydrofuran

2012 ◽  
Vol 550-553 ◽  
pp. 57-61
Author(s):  
Hao Li ◽  
Yong Hong Deng ◽  
Kai Huang
Keyword(s):  
Charge Transfer ◽  
Electrostatic Interaction ◽  
Self Assembly ◽  
The Self ◽  
Charge Transfer Complexes ◽  
Layer By Layer ◽  
Alkali Lignin ◽  
Higher Temperature ◽  
Effects Of Temperature

Alkali lignin (AL) was used as a polyanion to form layer-by-layer self-assembled film with PDAC as a polycation. The effects of temperature and concentration on the adsorption characteristics of AL were investigated. Iodine was added into AL solutions to study the role of π-π interaction in self-assembly of AL and PDAC. Results show that the self-assembly of AL/PDAC is mainly driven by π-π interaction and electrostatic interaction. A higher temperature or a larger concentration can enhance the aggregation of lignin. I2 can form lignin–iodine charge–transfer complexes with AL to reduce the degree of aggregation of AL, so the adsorbed amount of AL decreases significantly with increasing iodine contents.

scholarly journals Action of Designer Cellulosomes on HomogeneousVersusComplex Substrates

2005 ◽  
Vol 280 (16) ◽  
pp. 16325-16334 ◽  
Author(s):  
Henri-Pierre Fierobe ◽  
Florence Mingardon ◽  
Adva Mechaly ◽  
Anne Bélaïch ◽  
Marco T. Rincon ◽  
...  
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Glycoside Hydrolases ◽  
Synergistic Activity ◽  
Multiprotein Complex ◽  
And Topology ◽  
Processive Endoglucanase ◽  
The Family ◽  
Major Factors ◽  
Cellulose Binding

In recent work (Fierobe, H.-P., Bayer, E. A., Tardif, C., Czjzek, M., Mechaly, A., Belaïch, A., Lamed, R., Shoham, Y., and Belaich, J.-P. (2002)J. Biol. Chem. 277, 49621–49630), we reported the self-assembly of a comprehensive set of defined “bifunctional” chimeric cellulosomes. Each complex contained the following: (i) a chimeric scaffoldin possessing a cellulose-binding module and two cohesins of divergent specificity and (ii) two cellulases, each bearing a dockerin complementary to one of the divergent cohesins. This approach allowed the controlled integration of desired enzymes into a multiprotein complex of predetermined stoichiometry and topology. The observed enhanced synergy on recalcitrant substrates by the bifunctional designer cellulosomes was ascribed to two major factors: substrate targeting and proximity of the two catalytic components. In the present work, the capacity of the previously described chimeric cellulosomes was amplified by developing a third divergent cohesin-dockerin device. The resultant trifunctional designer cellulosomes were assayed on homogeneous and complex substrates (microcrystalline cellulose and straw, respectively) and found to be considerably more active than the corresponding free enzyme or bifunctional systems. The results indicate that the synergy between two prominent cellulosomal enzymes (from the family-48 and -9 glycoside hydrolases) plays a crucial role during the degradation of cellulose by cellulosomes and that one dominant family-48 processive endoglucanase per complex is sufficient to achieve optimal levels of synergistic activity. Furthermore cooperation within a cellulosome chimera between cellulases and a hemicellulase from different microorganisms was achieved, leading to a trifunctional complex with enhanced activity on a complex substrate.

scholarly journals Light-induced dilation in nanosheets of charge-transfer complexes

2018 ◽  
Vol 115 (15) ◽  
pp. 3776-3781 ◽  
Author(s):  
Zhuolei Zhang ◽  
Richard C. Remsing ◽  
Himanshu Chakraborty ◽  
Wenxiu Gao ◽  
Guoliang Yuan ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Charge Transfer ◽  
Self Assembly ◽  
Response Times ◽  
Charge Transfer Complexes ◽  
Wide Range ◽  
Molecular Charge ◽  
Molecular Components ◽  
Lattice Dilation ◽  
Electronic Technologies

We report the observation of a sizable photostrictive effect of 5.7% with fast, submillisecond response times, arising from a light-induced lattice dilation of a molecular nanosheet, composed of the molecular charge-transfer compound dibenzotetrathiafulvalene (DBTTF) and C60. An interfacial self-assembly approach is introduced for the thickness-controlled growth of the thin films. From photoabsorption measurements, molecular simulations, and electronic structure calculations, we suggest that photostriction within these films arises from a transformation in the molecular structure of constituent molecules upon photoinduced charge transfer, as well as the accommodation of free charge carriers within the material. Additionally, we find that the photostrictive properties of the nanosheets are thickness-dependent, a phenomenon that we suggest arises from surface-induced conformational disorder in the molecular components of the film. Moreover, because of the molecular structure in the films, which results largely from interactions between the constituent π-systems and the sulfur atoms of DBTTF, the optoelectronic properties are found to be anisotropic. This work enables the fabrication of 2D molecular charge-transfer nanosheets with tunable thicknesses and properties, suitable for a wide range of applications in flexible electronic technologies.

Functionalized naphthalenediimides based supramolecular charge–transfer complexes via self-assembly and their photophysical properties†

CrystEngComm ◽  
2021 ◽  
Author(s):  
Pooja Rani ◽  
Ahmad Husain ◽  
Ananya Shukla ◽  
Neha Singla ◽  
Ankit Kumar Srivastava ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Self Assembly ◽  
Photophysical Properties ◽  
Charge Transfer Complexes ◽  
Self Assembled ◽  
Organic Fluorophore ◽  
Ct Complexes

We report here the design and syntheses of a naphthalenediimide (NDI)-N functionalized organic fluorophore, 1 and its supramolecular CT complexes [(1∙2H)2+·(PA–)2] (2) and [(1∙2H)2+·(3,5-DNSA–)2] (3), self-assembled from 1 as an...

Synthesis and structures of 11,11,12,12-tetracyano-2,6-diiodo-9,10-anthraquinodimethane and its 2:1 cocrystals with anthracene, pyrene and tetrathiafulvalene

2016 ◽  
Vol 72 (12) ◽  
pp. 923-931 ◽  
Author(s):  
Yi Ren ◽  
Semin Lee ◽  
Jeffery Bertke ◽  
Danielle L. Gray ◽  
Jeffrey S. Moore
Keyword(s):  
Molecular Structure ◽  
Charge Transfer ◽  
Electron Donors ◽  
Dihedral Angles ◽  
Charge Transfer Complexes ◽  
Central Ring ◽  
The Family ◽  
Benzene Rings ◽  
Saddle Shape ◽  
Degree Of Charge Transfer

Radical salts and charge-transfer complexes (CTCs) containing tetracyanoquinodimethane (TCNQ) display electrical conductivity, which has led to the development of many TCNQ derivatives with enhanced electron-accepting properties that are applicable toward organic electronics. To expand the family of TCNQ derivatives, we report the synthesis and structures of 11,11,12,12-tetracyano-2,6-diiodo-9,10-anthraquinodimethane (abbreviated as DITCAQ), C20H6I2N4, and its charge-transfer complexes with various electron donors, namely DITCAQ–anthracene (2/1), C20H6I2N4·0.5C14H10, (I), DITCAQ–pyrene (2/1), C20H6I2N4·0.5C16H10, (II), and DITCAQ–tetrathiafulvalene (2/1), C20H6I2N4·0.5C6H4S4, (III). The molecular structure of DITCAQ consists of a 2,6-diiodo-9,10-dihydroanthracene moiety with two malononitrile substituents. DITCAQ possesses a saddle shape, since the malononitrile groups bend significantly up out of the plane of the central ring and the two benzene rings bend down out of the same plane. π–π interactions between DITCAQ and the electron-donor molecules control the degree of charge transfer in cocrystals (I), (II), and (III), which is reflected in both the dihedral angles between the terminal benzene ring and the central ring on the DITCAQ motifs, and their corresponding IR spectra.

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