Ligand Constraints and Synthesis of Metal–Organic Polyhedra

2015 ◽  
Vol 68 (5) ◽  
pp. 707 ◽  
Author(s):  
Harsh Vardhan ◽  
Francis Verpoort
Keyword(s):  
Metal Ions ◽  
Self Assembly ◽  
Three Dimensional ◽  
The Self ◽  
Bend Angle ◽  
Metal Organic ◽  
Discrete Structures ◽  
Hydrophobic Nature ◽  
Internal Volume

Metal–organic polyhedra are three dimensional discrete structures typically constructed by the self-assembly of metal ions and ligands. The synthesis and geometry of discrete structures entirely rely on the choice of metal ions, ligand constraints such as steric bulk, bend angle, and functionalities, and the nature of applied solvents. As a result, they provide tailorable internal volume and usually hydrophobic nature to the cavity that in turn makes them one of the prominent host molecules for a range of applications. This review highlights the intervention of ligand constraints, precisely bend angle (0°, 60°, 120°, and 180°), hydroxyl functionalities, and the role of concepts such as molecular panelling and subcomponent self-assembly in the synthesis of polyhedra.

Entangled 3D metal-organic architectures from the self-assembly of mixed ligands and transition-metal ions

2008 ◽  
Vol 877 (1-3) ◽  
pp. 56-63 ◽  
Author(s):  
Yong-Hui Wang ◽  
Yun-Wu Li ◽  
Wei-Lin Chen ◽  
Yang-Guang Li ◽  
En-Bo Wang
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Self Assembly ◽  
Transition Metal Ions ◽  
The Self ◽  
Mixed Ligands ◽  
Metal Organic

scholarly journals Application of Nanoscale Metal-Organic Frameworks as Imaging Agents in Biology and Medicine

2021 ◽  
Author(s):  
Fatma Demir Duman ◽  
Ross S Forgan
Keyword(s):  
Metal Ions ◽  
Porous Materials ◽  
Self Assembly ◽  
Metal Organic Frameworks ◽  
The Self ◽  
Imaging Agents ◽  
Facile Synthesis ◽  
Metal Organic ◽  
High Storage

Nanoscale metal-organic frameworks (NMOFs) are an interesting and unique class of hybrid porous materials constructed by the self-assembly of metal ions/clusters with organic linkers. The high storage capacities, facile synthesis,...

Role of Metal Ions in the Self-assembly of the Alzheimer’s Amyloid-β Peptide

2013 ◽  
Vol 52 (21) ◽  
pp. 12193-12206 ◽  
Author(s):  
Peter Faller ◽  
Christelle Hureau ◽  
Olivia Berthoumieu
Keyword(s):  
Metal Ions ◽  
Self Assembly ◽  
Amyloid Β ◽  
The Self ◽  
Amyloid Β Peptide

The Role of the Coordination Modes of a Flexible Bis(pyridylamide) Ligand in the Topology of 2D Copper(II) Complexes

2012 ◽  
Vol 67 (9) ◽  
pp. 877-886 ◽  
Author(s):  
Xiu-Li Wang ◽  
Peng Liu ◽  
Jian Luan ◽  
Hong-Yan Lin ◽  
Chuang Xu
Keyword(s):  
Self Assembly ◽  
Three Dimensional ◽  
Carbonyl Oxygen ◽  
Carbon Paste ◽  
X Ray Diffraction ◽  
Pyridyl Nitrogen ◽  
Benzenedicarboxylic Acid ◽  
Metal Organic ◽  
Coordination Layer

Two new two-dimensional copper(II) coordination polymers, [Cu(L)(BDC)]_H2O (1) and [Cu2(L)0:5(SIP)(OH)(H2O)] 2H2O (2) [L=N;N0-bis(3-pyridylamide)-1,6-hexane, H2BDC=1,3- benzenedicarboxylic acid, H3SIP=5-sulfoisophthalic acid (3,5-dicarboxybenzenesulfonic acid)], have been synthesized hydrothermally by self-assembly of the flexible bis-pyridyl-bis-amide ligand L and the aromatic polycarboxylate ligands H2BDC or H3SIP. X-Ray diffraction analysis reveals that complex 1 displays a metal-organic coordination layer with a binodal (3,5)-connected {42.67.8}{42.6} topology, in which the L ligands adopt a m2-bridging mode (via ligation of the pyridyl nitrogen atoms). Complex 2 also exhibits a layered network based on tetranuclear copper clusters [Cu4(μ3-OH)2(H2O)2(O2C-)4], L ligands and SIP anions, showing a binodal (4,8)-connected network with {414.610.84}{44.62} topology, in which the L ligands adopt a μ6-bridging coordination mode (via ligation of the pyridyl nitrogen and carbonyl oxygen atoms). Adjacent layers in 1 and 2 are further linked by hydrogen bonding interactions to form three-dimensional supramolecular frameworks. The electrochemical behavior of the two complexes in bulk-modified carbon paste electrodes has been investigated

Nanoscale Self-Assembly Using Ion and Electron Beam Techniques: A Rapid Review

MRS Advances ◽  
2020 ◽  
Vol 5 (64) ◽  
pp. 3507-3520
Author(s):  
Chunhui Dai ◽  
Kriti Agarwal ◽  
Jeong-Hyun Cho
Keyword(s):  
Electron Beam ◽  
Self Assembly ◽  
Ion Beam ◽  
Three Dimensional ◽  
The Self ◽  
Stress Generation ◽  
Rapid Review ◽  
High Yield ◽  
3D Nanostructures ◽  
Self Assembled

AbstractNanoscale self-assembly, as a technique to transform two-dimensional (2D) planar patterns into three-dimensional (3D) nanoscale architectures, has achieved tremendous success in the past decade. However, an assembly process at nanoscale is easily affected by small unavoidable variations in sample conditions and reaction environment, resulting in a low yield. Recently, in-situ monitored self-assembly based on ion and electron irradiation has stood out as a promising candidate to overcome this limitation. The usage of ion and electron beam allows stress generation and real-time observation simultaneously, which significantly enhances the controllability of self-assembly. This enables the realization of various complex 3D nanostructures with a high yield. The additional dimension of the self-assembled 3D nanostructures opens the possibility to explore novel properties that cannot be demonstrated in 2D planar patterns. Here, we present a rapid review on the recent achievements and challenges in nanoscale self-assembly using electron and ion beam techniques, followed by a discussion of the novel optical properties achieved in the self-assembled 3D nanostructures.

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).

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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