Dimeric Platinum Complex Synthesis via Solvent Optimization
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Solution Overview
Problem
Current methods for synthesizing dimeric transition metal complexes, particularly halogen-bridged platinum complexes, suffer from low yields and require expensive raw materials, making them industrially unattractive due to the formation of by-products and the need for excess platinum materials.
Innovation Solution
A process involving mixing a transition metal(II) salt with a monodentate organic phosphine ligand in an organic solvent at temperatures between 110°C and 150°C for at least 10 hours, in the presence of a nitrile compound, significantly improves the yield to over 85% by optimizing reaction conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to synthesize dimeric transition metal complexes, then the reaction can proceed with standard conditions, but the yield remains low (50-80%) and expensive raw materials are required in excess
Solution Approach 1:
The patent applies parameter changes by optimizing the reaction conditions including using a specific solvent system (mixture of toluene and acetonitrile in 4:1 v/v ratio), controlling temperature (reflux conditions), and adjusting the molar ratio of reactants (PtCl2:PR3 = 1:1.05 to 1:1.20). These parameter optimizations resolve the contradiction by achieving high yields (85-99%) while minimizing the excess of expensive platinum raw materials needed.
2Productivity
If conventional synthesis methods are employed, then the process can be performed with standard procedures, but by-products are formed resulting in low yield
Solution Approach 1:
The patent uses acetonitrile as an intermediary substance in the solvent mixture. This intermediary facilitates the reaction by coordinating with the platinum center and promoting the formation of the desired dimeric complex while minimizing side reactions. The specific ratio of toluene to acetonitrile (4:1 v/v) optimizes this intermediary effect, resolving the contradiction between high yield and by-product formation.
3Ease of manufacture
If existing synthesis routes are used, then the process can be implemented with current technology, but the cost is high due to expensive raw materials and low yield
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: the solvent composition (toluene/acetonitrile 4:1 ratio), temperature (reflux), and stoichiometry (PtCl2:PR3 ratio). These coordinated parameter changes improve the yield to 85-99%, which directly reduces the amount of costly platinum raw materials needed per unit of product, thereby improving industrial viability and reducing manufacturing costs.
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
This process achieves high yields of dimeric transition metal complexes, making them more industrially viable by reducing the need for excess expensive materials and minimizing by-product formation, and allows their use as precatalysts or catalysts in chemical reactions.
Implementation Method 1
mixing a transition metal(II) salt with a monodentate organic phosphine ligand in an organic solvent at temperatures between 110°C and 150°C for at least 10 hours
Data Source
AI summary
The present invention relates to transition metal complexes and its process of preparation. In particular the present invention relates to a process for preparing dimeric transition metal complexes and their use. More particularly the present invention relates to a process for preparing dimeric platinum metal complexes and their use. The present invention relates also to dimeric platinum metal complexes with triarylphosphine ligands, their process of preparation and their use.