Janus POSS Based on Mixed [2:6] Octakis-Adduct Regioisomers
Shuai-Yuan Han1, Xiao-Man Wang1, Yu Shao1
1Key Laboratory of Polymer Chemistry & Physics of the Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P.R. China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|March 25, 2016
Summary
Researchers synthesized Janus-type polyhedral oligomeric silsesquioxanes (POSS) with mixed functional groups. This novel method allows precise control over hetero-bifunctional POSS nano-building blocks for advanced applications.
Area of Science:
- Materials Science
- Organic Chemistry
- Nanotechnology
Background:
- Polyhedral oligomeric silsesquioxanes (POSS) are versatile nanoscale building blocks.
- Developing precisely functionalized POSS derivatives is crucial for advanced materials.
- Janus-type POSS with mixed surface functionalities offer unique properties.
Purpose of the Study:
- To synthesize regioisomeric Janus-type POSS with multiple, mixed surface functional groups.
- To establish a facile and controllable method for creating hetero-bifunctional POSS nano-building blocks.
- To explore the utility of thiol-ene click chemistry for POSS functionalization.
Main Methods:
- Utilized a cubic T8-POSS framework for synthesis.
- Employed two consecutive thiol-ene reactions.
- Isolated regioisomers (ortho, meta, para) via flash column chromatography.
- Characterized products using NMR spectroscopy ((1)H, (13)C, (29)Si) and MALDI-TOF mass spectrometry.
Main Results:
- Successfully synthesized a series of regioisomeric Janus-type POSS compounds.
- Achieved isolation of bis-adduct regioisomers in synthetically useful quantities.
- Demonstrated the installation of diverse functional groups onto the POSS framework.
- Confirmed product structures and configurations unambiguously.
Conclusions:
- Developed a robust synthetic route to precisely defined, hetero-bifunctional Janus POSS nano-building blocks.
- Thiol-ene click chemistry proves effective for controlled POSS surface modification.
- The synthesized Janus POSS materials hold potential for applications requiring tailored nanoscale components.
More Related Videos
06:35Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
8.6K
10:17Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
Published on: February 7, 2019
7.4K
Related Concept Videos
01:34Woodward–Hoffmann Selection Rules and Microscopic Reversibility
4.2K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
4.2K
02:32Stereoisomers
19.4K
On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to...
19.4K
02:37Disubstituted Cyclohexanes: cis-trans Isomerism
15.1K
Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds.
In cyclohexane, the substituents can occupy different positions generating distinct isomers....
In cyclohexane, the substituents can occupy different positions generating distinct isomers....
15.1K
02:33Stereoisomerism of Cyclic Compounds
11.8K
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
11.8K
02:52Stereoisomerism
14.5K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
14.5K
02:34Structural Isomerism
22.4K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
22.4K