Non-covalent interactions between anions and a cationic rhenium diamine complex: structural characterization of the supramolecular adducts

2006 ◽  
Vol 30 (6) ◽  
pp. 838-841 ◽  
Author(s):  
Sonia Nieto ◽  
Julio Pérez ◽  
Lucía Riera ◽  
Víctor Riera ◽  
Daniel Miguel
Keyword(s):  
Structural Characterization ◽  
Non Covalent Interactions ◽  
Complex Structural ◽  
Covalent Interactions

scholarly journals Characterization of N⋯O non-covalent interactions involving σ-holes: “electrostatics” or “dispersion”

2016 ◽  
Vol 18 (43) ◽  
pp. 29946-29954 ◽  
Author(s):  
Rahul Shukla ◽  
Deepak Chopra
Keyword(s):  
Non Covalent Interactions ◽  
Pnicogen Bonds ◽  
Covalent Interactions ◽  
Oxygen Atoms

Exploring the possibility of formation of pnicogen bonds or chalcogen bonds by utilizing the σ-holes present on nitrogen and oxygen atoms in per-halo substituted complexes.

scholarly journals The isolation and characterization of the high-molecular-weight glycoprotein from pig colonic mucus

1978 ◽  
Vol 173 (2) ◽  
pp. 569-578 ◽  
Author(s):  
T Marshall ◽  
A Allen
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Quaternary Structure ◽  
Water Soluble ◽  
Isolation And Characterization ◽  
Nuclease Digestion ◽  
Non Covalent Interactions ◽  
Covalent Interactions ◽  
Equilibrium Centrifugation

1. A high-molecular-weight glycoprotein constitutes over 80% by weight of the total glycoprotein from water-soluble pig colonic mucus. 2. It was isolated from from nucleic acid and non-covalently bound protein by nuclease digestion followed by equilibrium centrifugation in a CsCl gradient. 3. The glycoprotein has the following composition by weight: fucose 10.4%; glucosamine 23.9%; galactosamine 8.3%; sialic acid 9.9%; galactose 20.8%; sulphate 3.0%; protein 13.3%; moisture about 10%. 4. The native glycoprotein has the high mol.wt. of 15×10(6). 5. Reduction of the native glycoprotein with 2-mercaptoethanol results in a glycoprotein of mol.wt. 6×10(6). 6. Pronase digestion removes 29% of the protein (3% of the glycoprotein) but none of the carbohydrate. 7. The molecular weight of the Pronase-digested glycoprotein is 1.5×10(6), which is halved to 0.76×10(6) on reduction with 2-mercaptoethanol. 8. The contribution of non-covalent interactions, disulphide bridges and the non-glycosylated peptide core to the quaternary structure of the glycoprotein are discussed and compared with the known structure of pig gastric glycoportein.

scholarly journals Manifold Dynamic Non-Covalent Interactions for Steering Molecular Assembly and Cyclization

2021 ◽  
Author(s):  
Shaotang Song ◽  
Jie Su ◽  
Lulu Wang ◽  
Zhen Xu ◽  
Chia-Hsiu Hsu ◽  
...  
Keyword(s):  
Real Space ◽  
Molecular Assembly ◽  
Biological Processes ◽  
Chemical Transformations ◽  
Molecular Assemblies ◽  
Non Covalent Interactions ◽  
Covalent Interactions ◽  
Space Characterization

Deciphering rich non-covalent interactions that govern many chemical and biological processes is crucial for the design of drugs and controlling molecular assemblies and their chemical transformations. However, real-space characterization of...

scholarly journals Stereodynamic tetrahydrobiisoindole “NU-BIPHEP(O)”s: functionalization, rotational barriers and non-covalent interactions

2016 ◽  
Vol 12 ◽  
pp. 1453-1458 ◽  
Author(s):  
Golo Storch ◽  
Sebastian Pallmann ◽  
Frank Rominger ◽  
Oliver Trapp
Keyword(s):  
Adduct Formation ◽  
Enantioselective Catalysis ◽  
Cellulose Derivatives ◽  
Diphosphine Ligands ◽  
Rotational Barriers ◽  
Covalent Adduct ◽  
Non Covalent Interactions ◽  
Covalent Interactions

Stereodynamic ligands offer intriguing possibilities in enantioselective catalysis. “NU-BIPHEPs” are a class of stereodynamic diphosphine ligands which are easily accessible via rhodium-catalyzed double [2 + 2 + 2] cycloadditions. This study explores the preparation of differently functionalized “NU-BIPHEP(O)” compounds, the characterization of non-covalent adduct formation and the quantification of enantiomerization barriers. In order to explore the possibilities of functionalization, we studied modifications of the ligand backbone, e.g., with 3,5-dichlorobenzoyl chloride. Diastereomeric adducts with Okamoto-type cellulose derivatives and on-column deracemization were realized on the basis of non-covalent interactions. Enantioselective dynamic HPLC (DHPLC) allowed for the determination of rotational barriers of ΔG ‡ 298K = 92.2 ± 0.3 kJ mol−1 and 99.5 ± 0.1 kJ mol−1 underlining the stereodynamic properties of “NU-BIPHEPs” and “NU-BIPHEP(O)s”, respectively. These results make the preparation of tailor-made functionalized stereodynamic ligands possible and give an outline for possible applications in enantioselective catalysis.

Sign in / Sign up

Export Citation Format

Share Document