scholarly journals Supramolecular interactions between polylactide and model cyclosiloxanes with hydrogen bonding-capable functional groups

2020 ◽  
Vol 14 (2) ◽  
pp. 134-153 ◽  
Author(s):  
A. S. Herc ◽  
M. Wlodarska ◽  
M. Nowacka ◽  
J. Bojda ◽  
W. Szymanski ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Functional Groups ◽  
Supramolecular Interactions

scholarly journals Strategies for the Development of pH-Responsive Synthetic Polypeptides and Polymer-Peptide Hybrids: Recent Advancements

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 624
Author(s):  
Cintya Dharmayanti ◽  
Todd A. Gillam ◽  
Manuela Klingler-Hoffmann ◽  
Hugo Albrecht ◽  
Anton Blencowe
Keyword(s):  
Functional Groups ◽  
Hybrid Materials ◽  
Tumour Microenvironment ◽  
The Body ◽  
Supramolecular Interactions ◽  
Biological Interactions ◽  
Ph Responsive ◽  
Form Complex ◽  
Synthetic Polypeptides ◽  
External Stimuli

Synthetic polypeptides and polymer-peptide hybrid materials have been successfully implemented in an array of biomedical applications owing to their biocompatibility, biodegradability and ability to mimic natural proteins. In addition, these materials have the capacity to form complex supramolecular structures, facilitate specific biological interactions, and incorporate a diverse selection of functional groups that can be used as the basis for further synthetic modification. Like conventional synthetic polymers, polypeptide-based materials can be designed to respond to external stimuli (e.g., light and temperature) or changes in the environmental conditions (e.g., redox reactions and pH). In particular, pH-responsive polypeptide-based systems represent an interesting avenue for the preparation of novel drug delivery systems that can exploit physiological or pathological pH variations within the body, such as those that arise in the extracellular tumour microenvironment, intracellularly within endosomes/lysosomes, or during tissue inflammation. Here, we review the significant progress made in advancing pH-responsive polypeptides and polymer-peptide hybrid materials during the last five years, with a particular emphasis on the manipulation of ionisable functional groups, pH-labile linkages, pH-sensitive changes to secondary structure, and supramolecular interactions.

Carbohydrate based hyper-crosslinked organic polymers with –OH functional groups for CO2 separation

2015 ◽  
Vol 3 (42) ◽  
pp. 20913-20918 ◽  
Author(s):  
Haiying Li ◽  
Bo Meng ◽  
Shannon M. Mahurin ◽  
Song-Hai Chai ◽  
Kimberly M. Nelson ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Functional Groups ◽  
Carbon Capture ◽  
Carbon Capture And Storage ◽  
Co2 Separation ◽  
Organic Polymers ◽  
Microporous Polymers ◽  
Quadrupole Interactions ◽  
And Storage

A class of novel hyper-crosslinked microporous polymers, based on green and renewable carbohydrates, was synthesized for carbon capture and storage with high CO2/N2 selectivity by hydrogen bonding and dipole–quadrupole interactions.

Supramolecular Interactions in Aromatic Structures for Non-Optical and Optical Chemosensors of Explosive Chemicals

2021 ◽  
Vol 317 ◽  
pp. 202-207
Author(s):  
Juan Matmin ◽  
Nur Fatiha Ghazalli ◽  
Fazira Ilyana Abdul Razak ◽  
Hendrik O. Lintang ◽  
Mohamad Azani Jalani
Keyword(s):  
Hydrogen Bonding ◽  
High Performance ◽  
Molecular Design ◽  
Optical Sensing ◽  
Green Emission ◽  
Supramolecular Interactions ◽  
Side Chain ◽  
Optical Chemosensors ◽  
Random Aggregate ◽  
Metal Metal

The scientific investigation based on the molecular design of aromatic compounds for high-performance chemosensor is challenging. This is because their multiplex interactions at the molecular level should be precisely determined before the desired compounds can be successfully used as sensing materials. Herein, we report on the molecular design of chemosensors based on aromatic structures of benzene as the organic motif of benzene-1,3,5-tricarboxamides (BTA), as well as the benzene pyrazole complexes (BPz) side chain, respectively. In the case of BTA, the aromatic benzene acts as the centre to allow the formation of π–π stacking for one-dimensional materials having rod-like arrangements that are stabilized by threefold hydrogen bonding. We found that when nitrate was applied, the rod-like BTA spontaneously formed into a random aggregate due to the deformation of its hydrogen bonding to form inactive nitroso groups for non-optical sensing capability. For the optical chemosensor, the aromatic benzene is decorated as a side-chain of BPz to ensure that cage-shaped molecules make maximum use of their centre providing metal-metal interactions for fluorescence-based sensing materials. In particular, when exposed to benzene, Cu-BPz displayed a blue-shift of its original emission band from 616 to 572 nm (Δ = 44 nm) and emitted bright orange to green emission colours. We also observe a different mode of fluorescence-based sensing materials for Au-BPz, which shows a particular quenching mechanism resulting in 81% loss of its original intensity on benzene exposure to give less red-orange emission (λ = 612 nm). The BTA and BPz synthesized are promising high-performance supramolecular chemosensors based on the non-optical and optical sensing capability of a particular interest analyte.

scholarly journals Concomitant polymorphs of aryl-ether amine via catemer and dimer carboxylic acid supramolecular interactions and their effect on optical properties

2021 ◽  
Author(s):  
Mehboobali Pannipara ◽  
Abdullah G Al-Sehemi
Keyword(s):  
Optical Properties ◽  
Carboxylic Acid ◽  
Crystal Lattice ◽  
Functional Groups ◽  
Molecular Orbital ◽  
Acid Group ◽  
Supramolecular Interactions ◽  
Aryl Ether ◽  
Stability Calculation ◽  
The Stability

Abstract Carboxylic acid supramolecular synthon exhibited dimer or catemer motifs in the crystal lattice depend on the substituent and other functional groups present in the structure. In general, presence of other competing functional groups produced catemer motifs whereas unsubstituted acids showed dimer. In this manuscript, we have synthesized a new aryl ether amine-based Schiff base with carboxylic acid functionality ( 1 ) and demonstrated polymorphic structure via catemer ( 1a ) and dimer ( 1b ) motifs in the solid state. In both the structure, carboxylic acid group adopted different orientation in the crystal lattice. The different H-bonding lead to modulation of optical properties that was further supported highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) calculation. Further the stability calculation indicates that catemer structure was more stable by 8.54 kcal/mole relative to dimer motifs. In contrast, naphthyl group attached carboxylic acid structure did not show neither dimer nor catemer motifs in the crystal lattice as compared to diethylaminophenyl group, which confirm the presence of other substituent or competing functional groups strongly influence on the motifs of supramolecular interactions.

Adsorption behaviour of a CdII–triazole MOF for butan-2-one in a single-crystal-to-single-crystal (SCSC) fashion: the role of hydrogen bonding and C—H...π interactions

2019 ◽  
Vol 75 (6) ◽  
pp. 806-811
Author(s):  
Jia Wang ◽  
Tianchao You ◽  
Teng Wang ◽  
Qikui Liu ◽  
Jianping Ma ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Single Crystal ◽  
Specific Binding ◽  
Supramolecular Interactions ◽  
Adsorption Behaviour ◽  
X Ray Diffraction ◽  
Guest Molecules ◽  
X Ray ◽  
Π Interactions ◽  
H Nmr

The adsorption behaviour of the CdII–MOF {[Cd(L)2(ClO4)2]·H2O (1), where L is 4-amino-3,5-bis[3-(pyridin-4-yl)phenyl]-1,2,4-triazole, for butan-2-one was investigated in a single-crystal-to-single-crystal (SCSC) fashion. A new host–guest system that encapsulated butan-2-one molecules, namely poly[[bis{μ3-4-amino-3,5-bis[3-(pyridin-4-yl)phenyl]-1,2,4-triazole}cadmium(II)] bis(perchlorate) butanone sesquisolvate], {[Cd(C24H18N6)2](ClO4)2·1.5C4H8O} n , denoted C4H8O@Cd-MOF (2), was obtained via an SCSC transformation. MOF 2 crystallizes in the tetragonal space group P43212. The specific binding sites for butan-2-one in the host were determined by single-crystal X-ray diffraction studies. N—H...O and C—H...O hydrogen-bonding interactions and C—H...π interactions between the framework, ClO4 − anions and guest molecules co-operatively bind 1.5 butan-2-one molecules within the channels. The adsorption behaviour was further evidenced by 1H NMR, IR, TGA and powder X-ray diffraction experiments, which are consistent with the single-crystal X-ray analysis. A 1H NMR experiment demonstrates that the supramolecular interactions between the framework, ClO4 − anions and guest molecules in MOF 2 lead to a high butan-2-one uptake in the channel.

σ-Hole halogen bonding interactions in a mixed valence cobalt(iii/ii) complex and anti-electrostatic hydrogen bonding interaction in a cobalt(iii) complex: a theoretical insight

CrystEngComm ◽  
2018 ◽  
Vol 20 (45) ◽  
pp. 7281-7292 ◽  
Author(s):  
Kousik Ghosh ◽  
Klaus Harms ◽  
Antonio Bauzá ◽  
Antonio Frontera ◽  
Shouvik Chattopadhyay
Keyword(s):  
Hydrogen Bonding ◽  
Solid State ◽  
Dft Calculations ◽  
Mixed Valence ◽  
Halogen Bonding ◽  
Supramolecular Interactions ◽  
Hydrogen Bonding Interaction ◽  
Bonding Interaction ◽  
Solid State Structures ◽  
Theoretical Insight

Supramolecular interactions in the solid state structures of a mixed valence cobalt(ii/iii) complex and a cobalt(iii) complex have been studied using DFT calculations.

Effects of the functional groups attached to aromatic organic compounds on their adsorption onto preloaded activated carbon

2012 ◽  
Vol 66 (8) ◽  
pp. 1799-1805 ◽  
Author(s):  
Lu Zhaoyang ◽  
Jiang Bicun ◽  
Li Aimin
Keyword(s):  
Hydrogen Bonding ◽  
Activated Carbon ◽  
Linear Relationship ◽  
Functional Groups ◽  
Organic Compounds ◽  
Hydrophobic Effect ◽  
Aromatic Stacking ◽  
Micropore Surface Area ◽  
Adsorption Capacities ◽  
The Relationship

The adsorption of phenol, p-nitrophenol, aniline, and nitrobenzene onto a commercial granular activated carbon (GAC: F400) preloaded with tannic acid (TA), a model background contaminant, was investigated. Compared with virgin GAC, the adsorption capacities of the four selected aromatic organic compounds (AOCs) onto GACs preloaded with TA at three densities were affected significantly. Also, the relationship between the adsorption capacities of AOCs and the characteristics of GACs was further discussed and clarified in this manuscript. The differences in the functional groups attached to the AOCs did not affect the similar linear relationship between the micropore surface area and their capacities to AOCs. However, the adsorption capacities of AOCs on TA-loaded GAC were affected by the different functional groups on the four AOCs: 67.6% of the capacity of aniline for virgin F400 remained on F400c (a preloaded GAC), compared with 23.8, 25.9, and 36.5% of phenol, p-nitrophenol, and nitrobenzene, respectively. The diversity of adsorption behavior of the four AOCs with different substituents was the result of hybrid contributions, such as hydrogen bonding, hydrophobic effect and aromatic stacking.

Supramolecular cooperative interaction-induced assembly of phosphotungstate polyanions and sulfur-containing pyridine-based cations

CrystEngComm ◽  
2018 ◽  
Vol 20 (11) ◽  
pp. 1588-1596 ◽  
Author(s):  
Xuerui Tian ◽  
Xing Xin ◽  
Yuanzhe Gao ◽  
Zhangang Han
Keyword(s):  
Hydrogen Bonding ◽  
Cooperative Interaction ◽  
Supramolecular Interactions ◽  
Sulfur Containing

Three crystals were assembled by means of multiple weak intermolecular cooperative supramolecular interactions of hydrogen bonding, S⋯O, C–H⋯π, and polyanion–π.

The hydrogen-bonded complex bis(tert-butylammonium) 2,6-dichlorophenolate 2,4-dichlorophenol–2,4-dichlorophenolate tetrahydrofuran disolvate containing a chiralR53(10) hydrogen-bonded ring as a supramolecular synthon

2016 ◽  
Vol 72 (10) ◽  
pp. 720-723 ◽  
Author(s):  
Xiao-Qing Cai ◽  
Bei Tian ◽  
Jian-Nan Zhang ◽  
Zhi-Min Jin
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Crystal Structures ◽  
Functional Groups ◽  
High Probability ◽  
Internal Symmetry ◽  
Supramolecular Synthon ◽  
Π Interactions ◽  
Graph Set ◽  
Hydrogen Bonded

A fixed hydrogen-bonding motif with a high probability of occurring when appropriate functional groups are involved is described as a `supramolecular hydrogen-bonding synthon'. The identification of these synthons may enable the prediction of accurate crystal structures. The rare chiral hydrogen-bonding motifR53(10) was observed previously in a cocrystal of 2,4,6-trichlorophenol, 2,4-dichlorophenol and dicyclohexylamine. In the title solvated salt, 2C4H12N+·C6H3Cl2O−·(C6H3Cl2O−·C6H4Cl2O)·2C4H8O, five components, namely twotert-butylammonium cations, one 2,4-dichlorophenol molecule, one 2,4-dichlorophenolate anion and one 2,6-dichlorophenolate anion, are bound by N—H...O and O—H...O hydrogen bonds to form a hydrogen-bonded ring, with the graph-set motifR53(10), which is further associated with two pendant tetrahydrofuran molecules by N—H...O hydrogen bonds. The hydrogen-bonded ring has internal symmetry, with a twofold axis running through the centre of the 2,6-dichlorophenolate anion, and is isostructural with a previous and related structure formed from 2,4-dichlorophenol, dicyclohexylamine and 2,4,6-trichlorophenol. In the title crystal, helical columns are built by the alignment and twisting of the chiral hydrogen-bonded rings, along and across thecaxis, and successive pairs of rings are associated with each other through C—H...π interactions. Neighbouring helical columns are inversely related and, therefore, no chirality is sustained, in contrast to the previous case.

scholarly journals Single-crystal X-ray diffraction study of a host–guest system comprising monofunctionalized-hydroxy pillar[5]arene and 1-octanamine

2018 ◽  
Vol 74 (8) ◽  
pp. 1117-1120
Author(s):  
Talal F. Al-Azemi ◽  
Mickey Vinodh ◽  
Abdirahman A. Mohamod ◽  
Fatemeh H. Alipour
Keyword(s):  
Hydrogen Bonding ◽  
Alkyl Chain ◽  
Supramolecular Interactions ◽  
Asymmetric Unit ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydrogen Bonding Interactions ◽  
Guest Species ◽  
Guest System ◽  
Macrocycle Cavity

Co-crystallization of a monofunctionalized hydroxy pillar[5]arene with 1-octanamine resulted in the formation of an inclusion complex where the alkyl chain is threaded in the macrocycle cavity, namely 1,2,3,4-(1,4-dimethoxy)-5-(1-hydroxy-4-methoxy)-pillar[5]arene–1-octanamine–water (1/1/1), C44H48O10·C8H19N·H2O. The guest compound is stabilized inside the cavity by hydrogen-bonding and C—H...π interactions. The water molecule in the asymmetric unit mediates the formation of a supramolecular dimer by hydrogen-bonding interactions. These functionalized-pillararene hosts expand the possibility of exploring more supramolecular interactions with various guest species.

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