1
|
Dudek MK, Trzeciak K, Tajber L, Zając J, Kaźmierski S, Pindelska E, Makowski T, Svyntkivska M, Potrzebowski MJ. A New Look at the Mechanism of Cocrystal Formation and Coformers Exchange in Processes Forced by Mechanical and/or Thermal Stimuli - ex situ and in situ Studies of Low-Melting Eutectic Mixtures. Chemistry 2024; 30:e202302138. [PMID: 37957130 DOI: 10.1002/chem.202302138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 11/08/2023] [Accepted: 11/08/2023] [Indexed: 11/15/2023]
Abstract
Three different devices: ball mill, hot stage melting, and magic angle spinning (MAS) NMR rotor were used for the preparation of ethenzamide (ET) cocrystals with glutaric acid (GLU), ethylmalonic acid (EMA) and maleic acid (MAL) as coformers. In each case, well-defined binary systems (ET:EMA, ET:GLU, ET:MAL) were obtained. The common features of the two solvent free methods of cocrystal formation (grinding, melting) are presented on the basis of arguments obtained by solid state NMR spectroscopy. Thermal analysis (Differential Scanning Calorimetry) proved that the eutectic phase arises over a wide range of molar ratios of components for each of the binary systems. NMR techniques, supported by theoretical calculations, allowed to provide details about the pathway of the reaction mechanism with atomic accuracy. It was found that the formation of ET cocrystals is a complex process that requires five steps. Each step has been recognized and described. Variable temperature 1D and 2D MAS NMR experiments allowed to track physicochemical processes taking place in a molten state. Moreover, it was found that in a multicomponent mixture consisting of all four components, ET, EMA, GLU, and MAL, ET in the molten phase behaves as a specific selector choosing only one partner to form binary cocrystals according to energy preferences. The process of exchange of coformers in binary systems during grinding, melting, and NMR measurements is described. The stabilization energies (Estab ) and molecular electrostatic potential (MEP) maps computed for the cocrystals under discussion and their individual components rationalize the selection rules and explain the relationships between individual species.
Collapse
Affiliation(s)
- Marta K Dudek
- Centre of Molecular and Macromolecular Studies Polish Academy of Sciences, Sienkiewicza 112, 90-363, Lodz, Poland
| | - Katarzyna Trzeciak
- Centre of Molecular and Macromolecular Studies Polish Academy of Sciences, Sienkiewicza 112, 90-363, Lodz, Poland
| | - Lidia Tajber
- School of Pharmacy and Pharmaceuticals Sciences, the SFI Research Centre for Pharmaceuticals, Trinity College Dublin College Green, Dublin 2, Ireland
| | - Justyna Zając
- Centre of Molecular and Macromolecular Studies Polish Academy of Sciences, Sienkiewicza 112, 90-363, Lodz, Poland
| | - Sławomir Kaźmierski
- Centre of Molecular and Macromolecular Studies Polish Academy of Sciences, Sienkiewicza 112, 90-363, Lodz, Poland
| | - Edyta Pindelska
- Department of Pharmaceutical Chemistry and Biomaterials, Faculty of Pharmacy, Medical University of Warsaw, Banacha 1, 02-093, Warsaw, Poland
| | - Tomasz Makowski
- Centre of Molecular and Macromolecular Studies Polish Academy of Sciences, Sienkiewicza 112, 90-363, Lodz, Poland
| | - Mariia Svyntkivska
- Centre of Molecular and Macromolecular Studies Polish Academy of Sciences, Sienkiewicza 112, 90-363, Lodz, Poland
| | - Marek J Potrzebowski
- Centre of Molecular and Macromolecular Studies Polish Academy of Sciences, Sienkiewicza 112, 90-363, Lodz, Poland
| |
Collapse
|
2
|
Linberg K, Szymoniak P, Schönhals A, Emmerling F, Michalchuk AAL. The Origin of Delayed Polymorphism in Molecular Crystals Under Mechanochemical Conditions. Chemistry 2023; 29:e202302150. [PMID: 37679939 DOI: 10.1002/chem.202302150] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 09/05/2023] [Accepted: 09/07/2023] [Indexed: 09/09/2023]
Abstract
We show that mechanochemically driven polymorphic transformations can require extremely long induction periods, which can be tuned from hours to days by changing ball milling energy. The robust design and interpretation of ball milling experiments must account for this unexpected kinetics that arises from energetic phenomena unique to the solid state. Detailed thermal analysis, combined with DFT simulations, indicates that these marked induction periods are associated with processes of mechanical activation. Correspondingly, we show that the pre-activation of reagents can also lead to marked changes in the length of induction periods. Our findings demonstrate a new dimension for exerting control over polymorphic transformations in organic crystals. We expect mechanical activation to have a much broader implication across organic solid-state mechanochemistry.
Collapse
Affiliation(s)
- Kevin Linberg
- Bundesanstalt für Materialforschung und -prüfung (BAM), Richard-Willstätter-Strasse 11, and Unter den Eichen 87, 12205, Berlin, Germany
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489, Berlin, Germany
| | - Paulina Szymoniak
- Bundesanstalt für Materialforschung und -prüfung (BAM), Richard-Willstätter-Strasse 11, and Unter den Eichen 87, 12205, Berlin, Germany
| | - Andreas Schönhals
- Bundesanstalt für Materialforschung und -prüfung (BAM), Richard-Willstätter-Strasse 11, and Unter den Eichen 87, 12205, Berlin, Germany
| | - Franziska Emmerling
- Bundesanstalt für Materialforschung und -prüfung (BAM), Richard-Willstätter-Strasse 11, and Unter den Eichen 87, 12205, Berlin, Germany
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489, Berlin, Germany
| | - Adam A L Michalchuk
- Bundesanstalt für Materialforschung und -prüfung (BAM), Richard-Willstätter-Strasse 11, and Unter den Eichen 87, 12205, Berlin, Germany
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
| |
Collapse
|
3
|
Wohlgemuth M, Schmidt S, Mayer M, Pickhardt W, Grätz S, Borchardt L. Milling Medium-Free Suzuki Coupling by Direct Mechanocatalysis: From Mixer Mills to Resonant Acoustic Mixers. Chemistry 2023; 29:e202301714. [PMID: 37503657 DOI: 10.1002/chem.202301714] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 07/25/2023] [Accepted: 07/26/2023] [Indexed: 07/29/2023]
Abstract
Here we describe the development of a sustainable and cost-effective approach for catalytic cross-coupling reactions in mechanochemistry. It is found that the substrate's impact with the vessel wall alone is sufficient to initiate the reaction, thus indicating that milling balls function primarily as a mixing agent for direct mechanocatalytic Suzuki coupling. The absence of milling balls can be offset by adjusting the rheology using liquid-assisted grinding (LAG). The LAG sweet spot of 0.25 μL mg-1 is confirmed for both resonance acoustic mixers (RAMs) and ball-free mixer mills, and is higher than in the presence of milling balls. RAMs exhibit excellent performance in the Suzuki reaction, achieving yields of 90 % after 60 min and complete conversion after 90 min. The longevity of the milling vessel is significantly improved in a RAM, allowing for at least 20 reactions without deterioration.
Collapse
Affiliation(s)
- Maximilian Wohlgemuth
- Inorganic Chemistry I, Ruhr-Universität Bochum, Universitätsstraße150, 44801, Bochum, Germany
| | - Sarah Schmidt
- Inorganic Chemistry I, Ruhr-Universität Bochum, Universitätsstraße150, 44801, Bochum, Germany
| | - Maike Mayer
- Inorganic Chemistry I, Ruhr-Universität Bochum, Universitätsstraße150, 44801, Bochum, Germany
| | - Wilm Pickhardt
- Inorganic Chemistry I, Ruhr-Universität Bochum, Universitätsstraße150, 44801, Bochum, Germany
| | - Sven Grätz
- Inorganic Chemistry I, Ruhr-Universität Bochum, Universitätsstraße150, 44801, Bochum, Germany
| | - Lars Borchardt
- Inorganic Chemistry I, Ruhr-Universität Bochum, Universitätsstraße150, 44801, Bochum, Germany
| |
Collapse
|