Controlled supramolecular polymerization of π-systems

2020 ◽  
Vol 56 (50) ◽  
pp. 6757-6769 ◽  
Author(s):  
Goutam Ghosh ◽  
Pradip Dey ◽  
Suhrit Ghosh
Keyword(s):  
Growth Mechanism ◽  
Supramolecular Polymers ◽  
Chain Growth ◽  
A Chain ◽  
Supramolecular Polymerization

Externally-initiated controlled supramolecular polymerization of the kinetically trapped aggregated state in a chain growth mechanism can produce well-defined living supramolecular polymers and copolymers.

Controllable supramolecular polymerization via a chain-growth mechanism

2018 ◽  
Vol 54 (8) ◽  
pp. 928-931 ◽  
Author(s):  
Deep Sankar Pal ◽  
Haridas Kar ◽  
Suhrit Ghosh
Keyword(s):  
Carboxylic Acid ◽  
Sample Preparation ◽  
Growth Mechanism ◽  
Preparation Method ◽  
Chain Growth ◽  
Sample Preparation Method ◽  
Open Chain ◽  
Naphthalene Diimide ◽  
A Chain ◽  
Supramolecular Polymerization

A naphthalene-diimide appended carboxylic acid either spontaneously self-assembles (P) by an open-chain H-bonding or can be arrested in an intra-molecularly H-bonded monomeric state (M) depending on the sample preparation method. Living supramoleular polymerization of M can be initiated by a seed, generated from P.

Kumada Catalyst-Transfer Polycondensation of Thiophene-Based Oligomers: Robustness of a Chain-Growth Mechanism

2008 ◽  
Vol 41 (21) ◽  
pp. 7817-7823 ◽  
Author(s):  
Tetyana Beryozkina ◽  
Volodymyr Senkovskyy ◽  
Elisabeth Kaul ◽  
Anton Kiriy
Keyword(s):  
Growth Mechanism ◽  
Chain Growth ◽  
A Chain

scholarly journals How to Determine the Role of an Additive on the Length of Supramolecular Polymers?

2020 ◽  
Vol 02 (02) ◽  
pp. 129-142 ◽  
Author(s):  
Elisabeth Weyandt ◽  
Mathijs F. J. Mabesoone ◽  
Lafayette N. J. de Windt ◽  
E. W. Meijer ◽  
Anja R. A. Palmans ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Weight Control ◽  
Degree Of Polymerization ◽  
Supramolecular Polymers ◽  
Molecular Weights ◽  
Molecular Weight Control ◽  
A Chain ◽  
And Control ◽  
Supramolecular Polymerization

In polymer chemistry, modulation of sequence and control over chain length are routinely applied to alter and fine-tune the properties of covalent (co)polymers. For supramolecular polymers, the same principles underlying this control have not been fully elucidated up to this date. Particularly, rational control over molecular weight in dynamic supramolecular polymers is not trivial, especially when a cooperative mechanism is operative. We start this review by summarizing how molecular-weight control has been achieved in seminal examples in the field of supramolecular polymerizations. Following this, we propose to classify the avenues taken to control molecular weights in supramolecular polymerizations. We focus on dynamic cooperative supramolecular polymerization as this is the most challenging in terms of molecular weight control. We use a mass-balance equilibrium model to predict how the nature of the interaction of an additive B with the monomers and supramolecular polymers of component A affects the degree of aggregation and the degree of polymerization. We put forward a classification system that distinguishes between B acting as a chain capper, a sequestrator, a comonomer, or an intercalator. We also highlight the experimental methods applied to probe supramolecular polymerization processes, the type of information they provide in relation to molecular weight and degree of aggregation, and how this can be used to classify the role of B. The guidelines and classification delineated in this review to assess and control molecular weights in supramolecular polymers can serve to reevaluate exciting systems present in current literature and contribute to broaden the understanding of multicomponent systems.

scholarly journals Step-growth titanium-catalysed dehydropolymerisation of amine–boranes

2018 ◽  
Vol 9 (13) ◽  
pp. 3360-3366 ◽  
Author(s):  
Titel Jurca ◽  
Theresa Dellermann ◽  
Naomi E. Stubbs ◽  
Diego A. Resendiz-Lara ◽  
George R. Whittell ◽  
...  
Keyword(s):  
Growth Mechanism ◽  
Primary Amine ◽  
Chain Growth ◽  
Step Growth ◽  
A Chain ◽  
Amine Boranes

Titanium-catalysed dehydropolymerisation of primary amine–boranes was found to proceed via a step-growth rather than a chain-growth mechanism.

scholarly journals Sol-Gel Chemistry by Ring-Opening Polymerization

1999 ◽  
Vol 576 ◽  
Author(s):  
Kamyar Rahimian ◽  
Douglas A. Loy
Keyword(s):  
Growth Mechanism ◽  
Ring Opening ◽  
Sol Gel ◽  
Ring Opening Polymerization ◽  
Inorganic Materials ◽  
Ring Closure ◽  
Chain Growth ◽  
Alcohol Solvent ◽  
Phenylene Group ◽  
A Chain

ABSTRACTSol-gel processing of materials is plagued by shrinkage during polymerization of the alkoxide monomers and processing (aging and drying) of the resulting gels. We have developed a new class of hybrid organic-inorganic materials based on the solventless ring-opening polymerization (ROP) of monomers bearing the 2,2,5,5-tetramethyl-2,5-disilaoxacyclopentyl group, which permits us to drastically reduce shrinkage in sol-gel processed materials. Because the monomers are polymerized through a chain growth mechanism catalyzed by base rather than the step growth mechanism normally used in sol-gel systems, hydrolysis and condensation products are entirely eliminated. Furthermore, since water is not required for hydrolysis, an alcohol solvent is not necessary. Monomers with two disilaoxacyclopentyl groups, separated by a rigid phenylene group or a more flexible alkylene group, were prepared through disilylation of the corresponding diacetylenes, followed by ring closure and hydrogenation. Anionic polymerization of these materials, either neat or with 2,2,5,5-tetramethyl-2,5-disila-1-oxacyclopentane as a copolymer, affords thermally stable transparent gels with no visible shrinkage. These materials provide an easy route to the introduction of sol-gel type materials in encapsulation of microelectronics, which we have successfully demonstrated.

One-Pot Multimolecular Macrocyclization for the Expedient Synthesis of Macrocyclic Aromatic Pentamers by a Chain Growth Mechanism

2011 ◽  
Vol 6 (12) ◽  
pp. 3298-3305 ◽  
Author(s):  
Bo Qin ◽  
Sheng Shen ◽  
Chang Sun ◽  
Zhiyun Du ◽  
Kun Zhang ◽  
...  
Keyword(s):  
Growth Mechanism ◽  
Chain Growth ◽  
One Pot ◽  
A Chain

scholarly journals Living supramolecular polymerization based on reversible deactivation of a monomer by using a ‘dummy’ monomer

2019 ◽  
Vol 10 (28) ◽  
pp. 6770-6776 ◽  
Author(s):  
Tomoya Fukui ◽  
Norihiko Sasaki ◽  
Masayuki Takeuchi ◽  
Kazunori Sugiyasu
Keyword(s):  
New Method ◽  
Chain Growth ◽  
Reactive Monomer ◽  
Spontaneous Nucleation ◽  
Reversible Deactivation ◽  
A Chain ◽  
Supramolecular Polymerization

New method of living supramolecular polymerization is demonstrated. Spontaneous nucleation of a reactive monomer is suppressed by using a ‘dummy’ monomer. Addition of seeds can initiate supramolecular polymerization in a chain-growth manner.

scholarly journals Supramolecular Systems Containing B–N Frustrated Lewis Pairs of Tris(pentafluorophenyl)borane and Triphenylamine Derivatives

2021 ◽  
Vol 03 (02) ◽  
pp. 174-183
Author(s):  
P. Chidchob ◽  
S. A. H. Jansen ◽  
S. C. J. Meskers ◽  
E. Weyandt ◽  
N. P. van Leest ◽  
...  
Keyword(s):  
Materials Science ◽  
Supramolecular Polymers ◽  
Frustrated Lewis Pairs ◽  
Paramagnetic Resonance ◽  
Donor And Acceptor ◽  
Donor Acceptor ◽  
Noncovalent Polymers ◽  
Electron Paramagnetic ◽  
Supramolecular Polymerization ◽  
Lewis Pairs

The introduction of a chemical additive to supramolecular polymers holds high potential in the development of new structures and functions. In this regard, various donor- and acceptor-based molecules have been applied in the design of these noncovalent polymers. However, the incorporation of boron–nitrogen frustrated Lewis pairs in such architectures is still rare despite their many intriguing properties in catalysis and materials science. The limited choices of suitable boron derivatives represent one of the main limitations for the advancement in this direction. Here, we examine the use of the commercially available tris(pentafluorophenyl)borane with various triphenylamine derivatives to create supramolecular B–N charge transfer systems. Our results highlight the importance of a proper balance between the donor/acceptor strength and the driving force for supramolecular polymerization to achieve stable, long-range ordered B–N systems. Detailed analyses using electron paramagnetic resonance and optical spectroscopy suggest that tris(pentafluorophenyl)borane displays complex behavior with the amide-based triphenylamine supramolecular polymers and may interact in dimers or larger chiral aggregates, depending on the specific structure of the triphenylamines.

Sign in / Sign up

Export Citation Format

Share Document