Physical properties of regioregular polythiophene derivatives containing mesogenic or ionic group in the side chain

2004 ◽  
Author(s):  
Takashi Mihara ◽  
Hiroyuki Kohno ◽  
Naoyuki Koide
Keyword(s):  
Physical Properties ◽  
Side Chain ◽  
Ionic Group

A study of the relationships of interactions between Asp-201, Na+ or K+, and galactosyl C6 hydroxyl and their effects on binding and reactivity of β-galactosidase

2004 ◽  
Vol 82 (2) ◽  
pp. 275-284 ◽  
Author(s):  
Julia Xu ◽  
Mary A.A McRae ◽  
Scott Harron ◽  
Beatrice Rob ◽  
Reuben E Huber
Keyword(s):  
Physical Properties ◽  
Negative Charge ◽  
Binding Pocket ◽  
Side Chain ◽  
Wild Type ◽  
Sodium Potassium ◽  
The Difference ◽  
Potassium Binding ◽  
Covalent Intermediate ◽  
Catalytic Effects

The interactions between Na+ (and K+) and Asp-201 of β-galactosidase were studied. Analysis of the changes in Km and Vmax showed that the Kd for Na+ of wild type β-galactosidase (0.36 ± 0.09 mM) was about 10× lower than for K+ (3.9 ± 0.6 mM). The difference is probably because of the size and other physical properties of the ions and the binding pocket. Decreases of Km as functions of Na+ and K+ for oNPG and pNPG and decreases of the Ki of both shallow and deep mode inhibitors were similar, whereas the Km and Ki of substrates and inhibitors without C6 hydroxyls remained constant. Thus, Na+ and K+ are important for binding galactosyl moieties via the C6 hydroxyl throughout catalysis. Na+ and K+ had lesser effects on the Vmax. The Vmax of pNPF and pNPA (substrates that lack a C6 hydroxyl) did not change upon addition of Na+ or K+, showing that the catalytic effects are also mediated via the C6 hydroxyl. Arrhenius plots indicated that Na+, but not K+, caused k3 (degalactosylation) to increase. Na+ also caused the k2 (galactosylation) with oNPG, but not with pNPG, to increase. In contrast, K+ caused the k2 values with both oNPG and pNPG to increase. Na+ and K+ mainly altered the entropies of activation of k2 and k3 with only small effects on the enthalpies of activation. This strongly suggests that only the positioning of the substrate, transition states, and covalent intermediate are altered by Na+ and K+. Further evidence that positioning is important was that substitution of Asp-201 with a Glu caused the Km and Ki values to increase significantly. In addition, the Kd values for Na+ or K+ were 5 to 8 fold higher. The negative charge of Asp-201 was shown to be vital for Na+ and K+ binding. Large amounts of Na+ or K+ had no effect on the very large Km and Ki values of D201N-β-galactosidase and the Vmax values changed minimally and in a linear rather than hyperbolic way. D201F-β-galactosidase, with a very bulky hydrophobic side chain in place of Asp, essentially obliterated all binding and catalysis.Key words: β-galactosidase, sodium, potassium, binding, aspartic acid.

ChemInform Abstract: Synthesis of 2,2′-Bipyridines Bearing Amino or Carboxyl Group at the Side Chain and Physical Properties of Their Ruthenium(II) Complexes.

ChemInform ◽  
2010 ◽  
Vol 30 (24) ◽  
pp. no-no
Author(s):  
Akira Katoh ◽  
Yoshihiro Kitamura ◽  
Hideyuki Fujii ◽  
Yumi Horie ◽  
Tetsuji Satoh ◽  
...  
Keyword(s):  
Physical Properties ◽  
Side Chain ◽  
Carboxyl Group

scholarly journals Heterometal Grafted metalla-ynes and Poly(metalla-ynes): A Review on Structure–Property Relationships and Applications

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3654
Author(s):  
Rayya A. Al-Balushi ◽  
Ashanul Haque ◽  
Idris J. Al-Busaidi ◽  
Houda Al-Sharji ◽  
Muhammad S. Khan
Keyword(s):  
Physical Properties ◽  
Main Chain ◽  
Functional Materials ◽  
Photo Luminescence ◽  
Structural Features ◽  
Side Chain ◽  
Structure Property ◽  
Molecular Scaffolds ◽  
Structure Property Relationships ◽  
Rigid Rod

Metalla-ynes and poly(metalla-ynes) have emerged as unique molecular scaffolds with fascinating structural features and intriguing photo-luminescence (PL) properties. Their rigid-rod conducting backbone with tunable photo-physical properties has generated immense research interests for the design and development of application-oriented functional materials. Introducing a second d- or f-block metal fragment in the main-chain or side-chain of a metalla-yne and poly(metalla-yne) was found to further modulate the underlying features/properties. This review focuses on the photo-physical properties and opto-electronic (O-E) applications of heterometal grafted metalla-ynes and poly(metalla-ynes).

scholarly journals Linear poly(alkyl ethylene imine) with varying side chain length: synthesis and physical properties

2010 ◽  
Vol 1 (5) ◽  
pp. 747 ◽  
Author(s):  
Hanneke M. L. Lambermont-Thijs ◽  
Lies Bonami ◽  
Filip E. Du Prez ◽  
Richard Hoogenboom
Keyword(s):  
Physical Properties ◽  
Chain Length ◽  
Side Chain ◽  
Ethylene Imine ◽  
Side Chain Length ◽  
Linear Poly

A high triplet-energy polymer: synthesis and photo-physical properties of a π-stacked vinyl polymer having a xanthone moiety in the side chain

RSC Advances ◽  
2015 ◽  
Vol 5 (27) ◽  
pp. 21310-21315 ◽  
Author(s):  
Hiroyoshi Sugino ◽  
Yasuhito Koyama ◽  
Tamaki Nakano
Keyword(s):  
Excitation Energy ◽  
Physical Properties ◽  
Polymer Synthesis ◽  
Side Chain ◽  
Triplet Energy ◽  
Vinyl Polymer ◽  
Blue Phosphorescent

Poly(xanthon-3-yl methacrylate) having a π-stacked conformation efficiently harvests photo excitation energy for sky blue phosphorescent emission of iridium bis[(4,6-difluorophenyl)pyridinato-N,C2]picolinate (FIrpic) in solution and in film.

Low band gap diketopyrrolopyrrole-based small molecule bulk heterojunction solar cells: influence of terminal side chain on morphology and photovoltaic performance

RSC Advances ◽  
2016 ◽  
Vol 6 (34) ◽  
pp. 28658-28665 ◽  
Author(s):  
Quoc Viet Hoang ◽  
Chang Eun Song ◽  
In-Nam Kang ◽  
Sang-Jin Moon ◽  
Sang Kyu Lee ◽  
...  
Keyword(s):  
Physical Properties ◽  
Small Molecules ◽  
Band Gap ◽  
Small Molecule ◽  
Bulk Heterojunction ◽  
Photovoltaic Performance ◽  
Photovoltaic Property ◽  
Side Chain ◽  
Low Band Gap ◽  
Heterojunction Solar Cells

Two low band gap small molecules based on DPP with different terminal side chains were synthesized. They show similar physical properties but different photovoltaic property.

Synthesis and Physical Properties of Side-Chain Type Liquid Crystalline Poly(arylenevinylene)s

1997 ◽  
Vol 30 (6) ◽  
pp. 1857-1859 ◽  
Author(s):  
Yasutoshi Watanabe ◽  
Takashi Mihara ◽  
Naoyuki Koide
Keyword(s):  
Physical Properties ◽  
Liquid Crystalline ◽  
Side Chain ◽  
Chain Type

Effects of the ether oxygen atom in alkyl side chains on the physical properties of piperidinium ionic liquids

2018 ◽  
Vol 206 ◽  
pp. 523-534 ◽  
Author(s):  
T. Nokami ◽  
T. Yamashita ◽  
T. Komura ◽  
N. Handa ◽  
M. Shimizu ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Nitrogen Atom ◽  
Oxygen Atom ◽  
Physical Properties ◽  
Side Chain ◽  
Alkyl Side Chain ◽  
Ether Oxygen Atom ◽  
Alkyl Side Chains ◽  
Ether Oxygen ◽  
Positively Charged

Various types of piperidinium ionic liquids equipped with an oxygen atom-containing alkyl side chain on the positively charged nitrogen atom were systematically synthesized and their physical properties investigated.

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