A Molecular Balance for Measuring Aliphatic CH−π Interactions

2011 ◽  
Vol 13 (16) ◽  
pp. 4320-4323 ◽  
Author(s):  
William R. Carroll ◽  
Chen Zhao ◽  
Mark D. Smith ◽  
Perry J. Pellechia ◽  
Ken D. Shimizu
Keyword(s):  
Π Interactions ◽  
Molecular Balance

Measurement of Solvent OH−π Interactions Using a Molecular Balance

2017 ◽  
Vol 139 (19) ◽  
pp. 6550-6553 ◽  
Author(s):  
Josef M. Maier ◽  
Ping Li ◽  
Erik C. Vik ◽  
Christopher J. Yehl ◽  
Sharon M. S. Strickland ◽  
...  
Keyword(s):  
Π Interactions ◽  
Molecular Balance

Study of through-space substituent–π interactions using N-phenylimide molecular balances

2019 ◽  
Vol 6 (8) ◽  
pp. 1266-1271 ◽  
Author(s):  
Jungwun Hwang ◽  
Ping Li ◽  
Erik C. Vik ◽  
Ishwor Karki ◽  
Ken D. Shimizu
Keyword(s):  
Model System ◽  
Balance Model ◽  
Stacking Interactions ◽  
Π Interactions ◽  
Aromatic Stacking ◽  
System P ◽  
Molecular Balance

Substituent–π interactions associated with aromatic stacking interactions were experimentally measured using a small N-phenylimide molecular balance model system.

Probing Halogen−π versus CH−π Interactions in Molecular Balance

2020 ◽  
Vol 22 (20) ◽  
pp. 7870-7873
Author(s):  
Jie Jian ◽  
Jordi Poater ◽  
Paul B. White ◽  
Christine J. McKenzie ◽  
F. Matthias Bickelhaupt ◽  
...  
Keyword(s):  
Π Interactions ◽  
Molecular Balance

Binary [Hydrotris(indazol-1-yl)borato]metal Complexes, M(Tp4Bo)2[1] with M = Fe, Co, Ni, Cu, and Zn: Electronic Properties and Solvent-Dependent Framework Structures through C−H···π Interactions

2000 ◽  
Vol 2000 (6) ◽  
pp. 1229-1241 ◽  
Author(s):  
Christoph Janiak ◽  
Savas¸ Temizdemir ◽  
Sebastian Dechert ◽  
Werner Deck ◽  
Frank Girgsdies ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Electronic Properties ◽  
Π Interactions ◽  
Cu And Zn

P–Ge/Sn π Interactions Versus Arene···Ge/Sn Contacts for the Stabilization of Diphosphatetrylenes, (R2P)2E (E = Ge, Sn)

2019 ◽  
Vol 59 (1) ◽  
pp. 863-874 ◽  
Author(s):  
Keith Izod ◽  
Peter Evans ◽  
Paul G. Waddell
Keyword(s):  
Π Interactions

scholarly journals A Highly Efficient Neutral Anion Receptor in Polar Environments by Synergy of Anion−π Interactions and Hydrogen Bonding

2021 ◽  
Author(s):  
Marta Queizán ◽  
Marta Sánchez-Lozano ◽  
Marcos Mandado ◽  
Jose M. Hermida-Ramón
Keyword(s):  
Hydrogen Bonding ◽  
Anion Receptor ◽  
Π Interactions ◽  
Highly Efficient

A Photoluminescent Au(I)/Ag(I)/PNN coordination complex for Relatively Rapid and Reversible Alcohol Sensing

2021 ◽  
Author(s):  
Yanhui Tao ◽  
Yuwei Wang ◽  
Shengnan Hu ◽  
David James Young ◽  
Chengrong Lu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Coordination Complex ◽  
Trinuclear Complex ◽  
Low Molecular Weight ◽  
Radiative Relaxation ◽  
Π Interactions

Trinuclear complex [Au2Ag(dppmaphen)2(CN)2]PF6 photoluminesces on exposure to low molecular weight alcohols. This emission is likely due to C-H···π interactions between the analyte and –PPh2 group, that inhibits non-radiative relaxation of...

scholarly journals Deciphering the Role of π-Interactions in Polyelectrolyte Complexes Using Rationally Designed Peptides

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2074
Author(s):  
Sara Tabandeh ◽  
Cristina Elisabeth Lemus ◽  
Lorraine Leon
Keyword(s):  
Hydrogen Bonding ◽  
Phase Separation ◽  
Liquid Phase ◽  
Charge Density ◽  
Secondary Structures ◽  
Liquid Phase Separation ◽  
Polyelectrolyte Complexes ◽  
Π Interactions ◽  
Liquid Liquid Phase Separation

Electrostatic interactions, and specifically π-interactions play a significant role in the liquid-liquid phase separation of proteins and formation of membraneless organelles/or biological condensates. Sequence patterning of peptides allows creating protein-like structures and controlling the chemistry and interactions of the mimetic molecules. A library of oppositely charged polypeptides was designed and synthesized to investigate the role of π-interactions on phase separation and secondary structures of polyelectrolyte complexes. Phenylalanine was chosen as the π-containing residue and was used together with lysine or glutamic acid in the design of positively or negatively charged sequences. The effect of charge density and also the substitution of fluorine on the phenylalanine ring, known to disrupt π-interactions, were investigated. Characterization analysis using MALDI-TOF mass spectroscopy, H NMR, and circular dichroism (CD) confirmed the molecular structure and chiral pattern of peptide sequences. Despite an alternating sequence of chirality previously shown to promote liquid-liquid phase separation, complexes appeared as solid precipitates, suggesting strong interactions between the sequence pairs. The secondary structures of sequence pairs showed the formation of hydrogen-bonded structures with a β-sheet signal in FTIR spectroscopy. The presence of fluorine decreased hydrogen bonding due to its inhibitory effect on π-interactions. π-interactions resulted in enhanced stability of complexes against salt, and higher critical salt concentrations for complexes with more π-containing amino acids. Furthermore, UV-vis spectroscopy showed that sequences containing π-interactions and increased charge density encapsulated a small charged molecule with π-bonds with high efficiency. These findings highlight the interplay between ionic, hydrophobic, hydrogen bonding, and π-interactions in polyelectrolyte complex formation and enhance our understanding of phase separation phenomena in protein-like structures.

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