2,2'-Bipyridine Derivatives with Reactive Silyl Groups for Immobilization
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Solution Overview
Problem
The development of 2,2'-bipyridine derivatives with reactive silyl groups at position 5 is hindered by steric hindrance, making it difficult to immobilize transition metal complexes on solid supports, which limits their reuse and efficiency in catalytic applications.
Innovation Solution
A novel 2,2'-bipyridine derivative with a reactive silyl group at position 5 is synthesized, allowing for effective immobilization on solid supports, enabling the formation of supported-type transition metal complexes that can be reused as catalysts or used in electrochemical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a silyl group is introduced at position 6 of the bipyridine ring for immobilization, then the transition metal complex can be attached to solid support, but steric hindrance prevents formation of bis(bipyridine) and tris(bipyridine) complexes
Solution Approach 1:
The patent divides the bipyridine structure into two separate ligands, each containing a silyl group at position 5 rather than position 6. This segmentation allows both ligands to coordinate with the metal center without steric interference, enabling formation of stable bis(bipyridine) and tris(bipyridine) complexes while maintaining immobilization capability through the silyl groups.
Solution Approach 2:
The patent changes the position of the silyl group from position 6 to position 5 on the bipyridine ring. This positional shift creates additional spatial dimension for complex formation, allowing multiple ligands to coordinate with the metal center without steric hindrance, thus enabling versatile complex formation while preserving solid support attachment capability.
2Productivity
If transition metal complex is used in homogeneous system for catalysis, then reaction efficiency is high, but catalyst separation and reuse becomes difficult
Solution Approach 1:
The patent introduces a silyl group as an intermediary functional group on the bipyridine ligand that mediates between the hydrophobic transition metal complex and the hydrophilic solid support surface. This intermediary enables covalent bonding to the solid support while maintaining the complex's catalytic activity in homogeneous-like environments, thus achieving both high reaction efficiency and easy catalyst recovery.
Solution Approach 2:
The patent utilizes solid porous supports with high surface area for immobilizing the transition metal complex. The porous structure provides extensive surface area for catalyst attachment while allowing reactants and products to diffuse freely, maintaining high reaction efficiency while enabling easy separation and reuse of the catalyst through simple filtration or decantation.
3Reliability
If electronic interaction between transition metal complex and solid support is utilized for immobilization, then complex can be attached, but immobilization distance is too far from the support surface
Solution Approach 1:
The patent performs preliminary functionalization of the bipyridine ligand by introducing a silyl group at position 5 before complex formation. This preliminary action ensures that the silyl group is positioned optimally for direct covalent bonding to the solid support, creating a short and stable connection between the metal complex and the support surface, thus reducing immobilization distance while maintaining stability.
Solution Approach 2:
The patent changes the chemical parameter of the ligand by introducing a reactive silyl group that can form strong covalent bonds with the solid support. This parameter change transforms the immobilization mechanism from weak electronic interaction to strong covalent bonding, achieving stable attachment at a shorter distance from the support surface.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The new 2,2'-bipyridine derivative facilitates the immobilization of transition metal complexes, enhancing their recyclability and efficiency in catalytic processes and electrochemical applications, such as dye-sensitized photoelectric conversion and electrochemical sensing.
Implementation Method 1
silyl group can react with various types of substituents such as hydroxy group on the support
Implementation Method 2
absorb visible light in substantially all visible range at high conversion rate
Implementation Method 3
use of complexes of iron, cobalt, ruthenium, and the like as a catalyst for cyclization and dimerization of a conjugated diolefin
Implementation Method 4
use of complexes of iron, cobalt, ruthenium, and the like as a catalyst for cyclization and dimerization of a conjugated diolefin
Implementation Method 5
use of complexes of iron, cobalt, ruthenium, and the like as a catalyst for cyclization and dimerization of a conjugated diolefin
Data Source
Figure 1~2
AI summary
A 2,2'-bipyridine derivative having a reactive silyl group represented by the following general formula (1): wherein R1 and R2 represent a substituent selected from a monovalent hydrocarbon group, an organoxy group, an acyloxy group, hydroxy group, a halogen atom, hydrogen atom, mercapto group, an amino group, cyano group, cyanate group, isocyanate group, thiocyanate group, and isothiocyanate group; R3 represents a monovalent aliphatic unsaturated hydrocarbon group, an organoxy group, an alkoxy group, an acyloxy group, hydroxy group, a halogen atom, hydrogen atom, mercapto group, an amino group, cyano group, cyanate group, isocyanate group, thiocyanate group, and isothiocyanate group; R4 represents a reactive silyl group represented by the formula: R1R2 R3Si, a monovalent hydrocarbon group, or hydrogen atom; R5, R6, R7, and R8 are a monovalent hydrocarbon group or hydrogen atom.