Organic NLO material with H-bonded 1D helical self-assembly: synthesis, X-ray crystal structure, DFT calculations, SHG measurements and thermal studies of (5Z,6E)-1,10-phenanthroline-5,6-dione dioxime

CrystEngComm ◽  
2017 ◽  
Vol 19 (35) ◽  
pp. 5251-5258 ◽  
Author(s):  
A. Irudaya Jothi ◽  
V. Alexander
Keyword(s):  
Crystal Structure ◽  
Dft Calculations ◽  
Self Assembly ◽  
Thermal Studies ◽  
The Self ◽  
X Ray ◽  
Shg Efficiency

The role of H-bonding in the self-assembly of (5Z,6E)-1,10-phenanthroline-5,6-dione dioxime into a 1D helix and its SHG efficiency are reported.

Synthesis and crystal structure of an M 4 L 6 tetrahedral cage with outward-facing pockets from a substituted pyrazolyl–pyridine ligand

2018 ◽  
Vol 74 (8) ◽  
pp. 961-966
Author(s):  
Nawal K. Al Rasbi ◽  
Michael D. Ward
Keyword(s):  
Crystal Structure ◽  
Self Assembly ◽  
The Self ◽  
Pyridyl Ring ◽  
Current Interest ◽  
Pyridine Ligand ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Polydentate Ligands ◽  
Tetrahedral Complexes

The self-assembly of metal–polydentate ligands to give supramolecular tetrahedral complexes is of considerable current interest. A new ligand, 4-benzyl-2-[1-(2-{[3-(4-benzylpyridin-2-yl)-1H-pyrazol-1-yl]methyl}benzyl)-1H-pyrazol-3-yl]pyridine (L), with chelating pyrazolyl–pyridine units substituted on the 4-position of the pyridyl ring with benzyl units, has been synthesized and fully characterized. The self-assembly of L with cobalt(II) gave rise to a tetrahedral cage (hexakis{μ-4-benzyl-2-[1-(2-{[3-(4-benzylpyridin-2-yl)-1H-pyrazol-1-yl]methyl}benzyl)-1H-pyrazol-3-yl]pyridine}perchloratotetracobalt(II) octakis(perchlorate) acetonitrile undecasolvate, [Co4(ClO4)(C38H32N6)6](ClO4)7·11CH3CN) with approximate T symmetry. The X-ray crystal structure of the cage, i.e. [Co4 L 6\subsetClO4](ClO4)7, shows that the substituted benzyl groups are oriented away from the centres of their respective ligands towards the CoII vertices, making small outward-facing pockets from three benzyl rings at the corners of the tetrahedron.

Composite tectocapsules via the self-assembly of functionalized poly(divinylbenzene) microspheres

2004 ◽  
Vol 76 (7-8) ◽  
pp. 1365-1374 ◽  
Author(s):  
L. M. Croll ◽  
H. D. H. Stöver
Keyword(s):  
Electron Microscopy ◽  
Maleic Acid ◽  
Self Assembly ◽  
Building Blocks ◽  
The Self ◽  
Interfacial Assembly ◽  
X Ray ◽  
Release Data ◽  
Core Materials

Poly(divinylbenzene-55)[poly(DVB-55] microspheres were used as building blocks to form polymer capsule walls consisting of interconnected microspheres. The microspheres had to be surface-functionalized with maleic acid to facilitate their interfacial assembly. In addition, porous and functionalized poly(DVB-55) microspheres were embedded across interfacial polyurea capsule membranes to form composite tectocapsules where release of core materials is designed to occur through the microsphere pores, rather than by conventional wall diffusion. Electron microscopy and X-ray spectromicroscopy were used to characterize the wall compositions, and release data are presented to illustrate the role of microspheres acting as release portals.

Directive Effect of Chain Length in Modulating Peptide Nano-assemblies

2020 ◽  
Vol 27 (9) ◽  
pp. 923-929
Author(s):  
Gaurav Pandey ◽  
Prem Prakash Das ◽  
Vibin Ramakrishnan
Keyword(s):  
Electron Microscopy ◽  
Amino Acids ◽  
Light Scattering ◽  
Chain Length ◽  
Self Assembly ◽  
The Self ◽  
Ionic Charge ◽  
Self Assembling ◽  
Biophysical Techniques

Background: RADA-4 (Ac-RADARADARADARADA-NH2) is the most extensively studied and marketed self-assembling peptide, forming hydrogel, used to create defined threedimensional microenvironments for cell culture applications. Objectives: In this work, we use various biophysical techniques to investigate the length dependency of RADA aggregation and assembly. Methods: We synthesized a series of RADA-N peptides, N ranging from 1 to 4, resulting in four peptides having 4, 8, 12, and 16 amino acids in their sequence. Through a combination of various biophysical methods including thioflavin T fluorescence assay, static right angle light scattering assay, Dynamic Light Scattering (DLS), electron microscopy, CD, and IR spectroscopy, we have examined the role of chain-length on the self-assembly of RADA peptide. Results: Our observations show that the aggregation of ionic, charge-complementary RADA motifcontaining peptides is length-dependent, with N less than 3 are not forming spontaneous selfassemblies. Conclusion: The six biophysical experiments discussed in this paper validate the significance of chain-length on the epitaxial growth of RADA peptide self-assembly.

scholarly journals Understanding the role of conjugation length on the self-assembly behaviour of oligophenyleneethynylenes

2021 ◽  
Author(s):  
Beatriz Matarranz ◽  
Goutam Ghosh ◽  
Ramesh Kandanelli ◽  
Angel Sampedro ◽  
Kalathil K. Kartha ◽  
...  
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Conjugation Length ◽  
The Relationship

We unravel the relationship between conjugation length and self-assembly behaviour of oligophenyleneethynylenes (OPEs).

The Evaluation of TiTe2 as a Diffusion Barrier in the Formation of Low Thermal Conductivity Nanolaminates with Bi2Te3 and Sb2Te3

2010 ◽  
Vol 74 ◽  
pp. 38-47
Author(s):  
Clay Mortensen ◽  
Paul Zschack ◽  
David C. Johnson
Keyword(s):  
Thermal Conductivity ◽  
Diffusion Barrier ◽  
Self Assembly ◽  
Low Temperatures ◽  
Annealing Temperature ◽  
The Self ◽  
High Angle ◽  
X Ray Diffraction ◽  
Amorphous Precursor ◽  
X Ray

The evolution of designed [(Ti-Te)]x[(Sb-Te)]y, [(Bi-Te)]x[(Sb-Te)]y, [(Ti-Te)]w[(Bi-Te)]x[(Sb-Te)]y and [(Ti-Te)]w[(Bi-Te)]x[(Ti-Te)]y[(Sb-Te)]z precursors were followed as a function of annealing temperature and time using both low and high angle x-ray diffraction techniques to probe the self assembly into nanolaminate materials. The [(Bi-Te)]x[(Sb-Te)]y precursors were found to interdiffuse at low temperatures to form a (BixSb1-x)2Te3 alloy. The [(Ti-Te)]x[(Bi-Te)]y and [(Ti-Te)]x[(Sb-Te)]y precursors formed ordered nanolaminates [{(TiTe2)}1.35]x[Bi2Te3]y and [{(TiTe2)}1.35]x[Sb2Te3]y respectively. The [(Ti-Te)]w[(Bi-Te)]x[(Sb-Te)]x precursors formed [{(TiTe2)}1.35]w[(Bi0.5Sb0.5)2Te3]2x nanolaminates on annealing, as the bismuth and antimony layers interdiffused. Over the range of TiTe2 thicknesses used in [(Ti-Te)]w[(Bi-Te)]x[(Ti-Te)]y[(Sb-Te)]z precursors, Bi and Sb were found to interdiffuse through the 2-4 nm thick Ti-Te layers, resulting in the formation of (BixSb1-x)2Te3 alloy layers as part of the final nanolaminated products. When the Bi-Te and Sb-Te thicknesses were equal in the amorphous precursors, symmetric [{(TiTe2)}1.35]m[(Bi0.5Sb0.5)2Te3]n nanolamiantes were formed. When the thicknesses of Bi-Te and Sb-Te layers were not equal in the amorphous precursor, asymmetric [(TiTe2)1.35]m[(BixSb1-x)2Te3]n[(TiTe2)1.35]m[(BixSb1-x)2Te3]p nanolaminates were formed. These results imply that to form (A)w(B)x(C)y nanolaminates using designed layered precursors all three components must be immiscible. To form (A)x(B)y(A)x(C)z nanolaminates, the components must be immiscible or the precursor to the A component and the A component itself must be an effective interdiffusion barrier preventing B and C from mixing.

Role of Multivalent Cations in the Self-Assembly of Phospholipid−DNA Complexes

2007 ◽  
Vol 111 (51) ◽  
pp. 14233-14238 ◽  
Author(s):  
Guillaume Tresset ◽  
Wun Chet Davy Cheong ◽  
Yeng Ming Lam
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Dna Complexes
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