Fluorinated Tris(2-pyridyl)borate Ligands for Stable Coinage Metal Ethylene Complexes
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Solution Overview
Problem
Current poly(pyridyl)borates are limited in their applications due to their steric profile and ligand backbone, which restricts their utility in metal coordination chemistry, particularly in catalysis and intermediate isolation processes.
Innovation Solution
Development of fluorinated tris(2-pyridyl)borate ligands, such as [t-BuPhB(6-(CF3)Py)3]−, which provide enhanced steric protection and coordination capabilities, allowing for the formation of stable coinage metal ethylene complexes with trigonal planar geometry, and their synthesis through reaction of a boron precursor with a pyridine reagent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorinated tris(2-pyridyl)borate ligands are used, then coordination stability and versatility are improved, but steric bulk increases
Solution Approach 1:
The patent applies local quality by introducing fluorine atoms at specific positions (R3 groups) on the pyridyl rings while keeping other regions of the ligand framework relatively compact. This localized modification enhances coordination stability through electrostatic interactions without uniformly increasing the overall steric bulk of the entire ligand molecule.
Solution Approach 2:
The ligand structure combines multiple functional elements: the borate core, pyridyl donor groups, and fluorine substituents create a composite molecular architecture. This composite design allows the different components to contribute separately to coordination stability (through multiple donor atoms and fluorine electrostatic effects) while managing steric requirements.
2Adaptability or versatility
If fluorinated tris(2-pyridyl)borate ligands are used, then catalytic activity and application range are improved, but ligand complexity increases
Solution Approach 1:
The fluorinated tris(2-pyridyl)borate ligand exhibits multi-functionality by supporting various coinage metal ions (Cu, Ag, Au) and accommodating different coordination geometries. The same ligand framework can participate in catalysis, intermediate isolation, and structural studies, making it a universal platform despite its molecular complexity.
Solution Approach 2:
The patent utilizes parameter changes by systematically varying the fluorine substitution patterns (different R3 groups) and pyridyl ring positions to tune the electronic and steric properties of the ligand. This allows optimization for specific applications while maintaining the core versatile framework.
3Force
If fluorine substitution is introduced, then electrostatic interactions with metal ions are enhanced, but synthesis difficulty increases
Solution Approach 1:
The synthesis strategy employs preliminary action by first preparing the fluorinated pyridine building blocks (with R3 groups already in place) before assembling them onto the borate core. This pre-functionalization approach allows the electrostatic-enhancing fluorine atoms to be installed early, simplifying subsequent coordination steps while achieving the desired strong metal-ligand interactions.
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 fluorinated tris(2-pyridyl)borate ligands demonstrate robustness and versatility in supporting coinage metal ions, enabling stable ethylene complexes with improved metrical and spectroscopic features, and computational analysis indicates significant electrostatic and covalent interactions with ethylene, enhancing their coordination properties.
Implementation Method 1
computational analysis indicates significant electrostatic and covalent interactions with ethylene
Implementation Method 2
computational analysis indicates significant electrostatic and covalent interactions with ethylene
Data Source
AI summary
Disclosed herein are poly(pyridyl)borate ligands and metal complexes comprising the poly(pyridyl)borate ligands. Also disclosed herein are methods of making and methods of using said poly(pyridyl)borate ligands and metal complexes comprising the poly(pyridyl)borate ligands. Also disclosed herein are methods of preparing a poly(pyridyl)borate ligand comprising reacting a boron precursor comprising a trifluoroborate to form the poly(pyridyl)borate ligand.