1
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Dellai A, Naim C, Cerezo J, Prampolini G, Castet F. Dynamic effects on the nonlinear optical properties of donor acceptor stenhouse adducts: insights from combined MD + QM simulations. Phys Chem Chem Phys 2024; 26:13639-13654. [PMID: 38511505 DOI: 10.1039/d4cp00310a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/22/2024]
Abstract
The second-order nonlinear optical (NLO) responses of a donor-acceptor stenhouse adduct (DASA) are investigated by using a computational approach combining molecular dynamics simulations and density functional theory (DFT) calculations. Specific force fields for the open and closed photoswitching forms are first parameterized and validated according to the Joyce protocol, in order to finely reproduce the geometrical features and potential energy surfaces of both isomers in chloroform solution. Then, DFT calculations are performed on structural snapshots extracted at regular time steps of the MD trajectories to address the influence of the thermalized conformational dynamics on the NLO responses related to hyper-Rayleigh scattering (HRS) experiments. We show that accounting for the structural dynamics largely enhances the HRS hyperpolarizability (βHRS) compared to DFT calculations considering solely equilibrium geometries, and greatly improves the agreement with experimental measurements. Furthermore, we show that the NLO responses of the NLO-active open form are correlated with the bond order alternation along the triene bridge connecting the donor and acceptor moieties, which is rationalized using simple essential state models.
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Affiliation(s)
- Angela Dellai
- Univ. Bordeaux, CNRS, Bordeaux INP, Institut des Sciences Moléculaires, UMR 5255, F-33400 Talence, France.
| | - Carmelo Naim
- Univ. Bordeaux, CNRS, Bordeaux INP, Institut des Sciences Moléculaires, UMR 5255, F-33400 Talence, France.
- Donostia International Physics Center (DIPC), Manuel Lardizabal Ibilbidea 4, 20018 Donostia, Euskadi, Spain
| | - Javier Cerezo
- Departamento de Química and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | | | - Frédéric Castet
- Univ. Bordeaux, CNRS, Bordeaux INP, Institut des Sciences Moléculaires, UMR 5255, F-33400 Talence, France.
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2
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Clerc M, Sandlass S, Rifaie-Graham O, Peterson JA, Bruns N, Read de Alaniz J, Boesel LF. Visible light-responsive materials: the (photo)chemistry and applications of donor-acceptor Stenhouse adducts in polymer science. Chem Soc Rev 2023; 52:8245-8294. [PMID: 37905554 PMCID: PMC10680135 DOI: 10.1039/d3cs00508a] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Indexed: 11/02/2023]
Abstract
Donor-acceptor Stenhouse adduct (DASA) photoswitches have gained a lot of attention since their discovery in 2014. Their negative photochromism, visible light absorbance, synthetic tunability, and the large property changes between their photoisomers make them attractive candidates over other commonly used photoswitches for use in materials with responsive or adaptive properties. The development of such materials and their translation into advanced technologies continues to widely impact forefront materials research, and DASAs have thus attracted considerable interest in the field of visible-light responsive molecular switches and dynamic materials. Despite this interest, there have been challenges in understanding their complex behavior in the context of both small molecule studies and materials. Moreover, incorporation of DASAs into polymers can be challenging due to their incompatibility with the conditions for most common polymerization techniques. In this review, therefore, we examine and critically discuss the recent developments and challenges in the field of DASA-containing polymers, aiming at providing a better understanding of the interplay between the properties of both constituents (matrix and photoswitch). The first part summarizes current understanding of DASA design and switching properties. The second section discusses strategies of incorporation of DASAs into polymers, properties of DASA-containing materials, and methods for studying switching of DASAs in materials. We also discuss emerging applications for DASA photoswitches in polymeric materials, ranging from light-responsive drug delivery systems, to photothermal actuators, sensors and photoswitchable surfaces. Last, we summarize the current challenges in the field and venture on the steps required to explore novel systems and expand both the functional properties and the application opportunities of DASA-containing polymers.
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Affiliation(s)
- Michèle Clerc
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Biomimetic Membranes and Textiles, 9014 St. Gallen, Switzerland.
- University of Fribourg, Department of Chemistry, 1700 Fribourg, Switzerland
- Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, UK
- Swiss National Center of Competence in Research Bio-Inspired Materials, Switzerland
| | - Sara Sandlass
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, USA
| | - Omar Rifaie-Graham
- Department of Chemistry, School of Physical and Chemical Sciences, Queen Mary University of London, London E1 4NS, UK
| | - Julie A Peterson
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA.
| | - Nico Bruns
- Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, UK
- Swiss National Center of Competence in Research Bio-Inspired Materials, Switzerland
- Department of Chemistry, Technical University of Darmstadt, 64287 Darmstadt, Germany.
| | - Javier Read de Alaniz
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA.
| | - Luciano F Boesel
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Biomimetic Membranes and Textiles, 9014 St. Gallen, Switzerland.
- Swiss National Center of Competence in Research Bio-Inspired Materials, Switzerland
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3
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Dubuis S, Dellai A, Courdurié C, Owona J, Kalafatis A, Vellutini L, Genin E, Rodriguez V, Castet F. Nonlinear Optical Responses of Photoswitchable Donor-Acceptor Stenhouse Adducts. J Am Chem Soc 2023; 145:10861-10871. [PMID: 37141624 DOI: 10.1021/jacs.3c02778] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
This work combines hyper-Rayleigh scattering (HRS) experiments performed in the NIR range (1.30 and 1.60 μm) and quantum chemical calculations to provide a comprehensive description of the second harmonic generation (SHG) responses of donor-acceptor Stenhouse adducts (DASAs). Representative derivatives of the three generations of DASAs, which differ by the nature of their electron-donating and withdrawing moieties and also include clickable species, have been synthesized and their photoswitching behavior fully characterized. The HRS measurements allow us to establish relationships between the magnitude of the SHG response of open forms and the nature of the donor and acceptor groups. The largest SHG responses are obtained for derivatives incorporating either a barbituric acid or an indanedione acceptor unit, while N-methylaniline appears as the most efficient donor group. The calculations support well the experimental data and show that high hyperpolarizabilities are associated to low excitation energies and large extent of the photoinduced intramolecular charge transfer, which enhances the dipole moment variation between the ground and first dipole-allowed electronic excited state. In addition, a complete investigation of the photoswitching kinetics of DASAs in chloroform solution shows important differences, highlighting in particular the role of the donor group on the photoswitching efficiency.
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Affiliation(s)
- Simon Dubuis
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33405 Cedex Talence, France
| | - Angela Dellai
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33405 Cedex Talence, France
| | - Chloé Courdurié
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33405 Cedex Talence, France
| | - Josianne Owona
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33405 Cedex Talence, France
| | - Apostolos Kalafatis
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33405 Cedex Talence, France
| | - Luc Vellutini
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33405 Cedex Talence, France
| | - Emilie Genin
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33405 Cedex Talence, France
| | - Vincent Rodriguez
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33405 Cedex Talence, France
| | - Frédéric Castet
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33405 Cedex Talence, France
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4
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Li Y, Zhu C, Gu F, Liu F. Revisiting photocyclization of the donor-acceptor stenhouse adduct: missing pieces in the mechanistic jigsaw discovered. Phys Chem Chem Phys 2023; 25:7417-7422. [PMID: 36847409 DOI: 10.1039/d2cp05143e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
Donor-acceptor Stenhouse adducts (DASA) have recently emerged as a class of visible-light-induced photochromic molecular switches, but their photocyclization mechanism remains puzzling and incomplete. In this work, we carried out MS-CASPT2//SA-CASSCF calculations to reveal the complete mechanism of the dominant channels and possible side reactions. We found that a new thermal-then-photo isomerization channel, i.e., EEZ → EZZ → EZE, other than the commonly accepted EEZ → EEE → EZE channel, is dominant in the initial step. Besides, our calculations rationalized why the expected byproducts ZEZ and ZEE are unobserved and proposed a competitive stepwise channel for the final ring-closure step. The findings here redraw the mechanistic picture of the DASA reaction by better accounting for experimental observations, and more importantly, provide critical physical insight in understanding the interplay between thermal- and photo-induced processes widely present in photochemical synthesis and reactions.
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Affiliation(s)
- Yazhen Li
- Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou 510006, P. R. China. .,Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an 710119, P. R. China.
| | - Chaoyuan Zhu
- Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou 510006, P. R. China.
| | - Fenglong Gu
- Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou 510006, P. R. China.
| | - Fengyi Liu
- Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an 710119, P. R. China.
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5
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Peñín B, Sanosa N, Sampedro D, Funes-Ardoiz I. Mechanism of the Aza-Piancatelli Reaction: Scope and Limitations of Furan Substitution in Donor-Acceptor Stenhouse Adduct Synthesis. ACS OMEGA 2022; 7:22811-22817. [PMID: 35811875 PMCID: PMC9261078 DOI: 10.1021/acsomega.2c02439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 06/02/2022] [Indexed: 06/15/2023]
Abstract
The aza-Piancatelli reaction has been widely used to synthesize donor-acceptor Stenhouse adducts (DASAs), a new class of molecular photoswitches with unique properties. However, the substitution pattern of furan cores has been limited to position 3, as 3,4-disubstituted furans remain unreactive. Herein, we explore the aza-Piancatelli reaction mechanism using density functional theory (DFT) calculations to understand the influence of the different substituents on the reactivity. We found that all the reaction pathways are kinetically accessible, but the driving force of the reaction is lost in disubstituted furans due to the loss of conjugation in the DASA products. Finally, a simple model is proposed to guide the design of synthetic routes using this reaction.
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6
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A multi-stage single photochrome system for controlled photoswitching responses. Nat Chem 2022; 14:942-948. [PMID: 35681046 DOI: 10.1038/s41557-022-00947-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 04/07/2022] [Indexed: 11/08/2022]
Abstract
The ability of molecular photoswitches to convert on/off responses into large macroscale property change is fundamental to light-responsive materials. However, moving beyond simple binary responses necessitates the introduction of new elements that control the chemistry of the photoswitching process at the molecular scale. To achieve this goal, we designed, synthesized and developed a single photochrome, based on a modified donor-acceptor Stenhouse adduct (DASA), capable of independently addressing multiple molecular states. The multi-stage photoswitch enables complex switching phenomena. To demonstrate this, we show spatial control of the transformation of a three-stage photoswitch by tuning the population of intermediates along the multi-step reaction pathway of the DASAs without interfering with either the first or final stage. This allows for a photonic three-stage logic gate where the secondary wavelength solely negates the input of the primary wavelength. These results provide a new strategy to move beyond traditional on/off binary photochromic systems and enable the design of future molecular logic systems.
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7
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McDonough R, Rudgley N, Majewski O, Perkins MV, Evans RA, Lewis DA. Photochromic performance of Donor‐Acceptor‐Stenhouse‐Adducts in Polymer Binders and Solution. CHEMPHOTOCHEM 2022. [DOI: 10.1002/cptc.202200076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Rowan McDonough
- Flinders University College of Science and Engineering AUSTRALIA
| | - Nick Rudgley
- Flinders University College of Science and Engineering AUSTRALIA
| | - Oskar Majewski
- DST Group: Defence Science and Technology Group Land Division AUSTRALIA
| | | | | | - David Andrew Lewis
- Flinders University School of Chemical and Physical Sciences Sturt Rd 5042 Adelaide AUSTRALIA
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8
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Sanchez DM, Raucci U, Martínez TJ. In Silico Discovery of Multistep Chemistry Initiated by a Conical Intersection: The Challenging Case of Donor-Acceptor Stenhouse Adducts. J Am Chem Soc 2021; 143:20015-20021. [PMID: 34761899 DOI: 10.1021/jacs.1c06648] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Detailed mechanistic understanding of multistep chemical reactions triggered by internal conversion via a conical intersection is a challenging task that emphasizes limitations in theoretical and experimental techniques. We present a discovery-based, hypothesis-free computational approach based on first-principles molecular dynamics to discover and refine the switching mechanism of donor-acceptor Stenhouse adducts (DASAs). We simulate the photochemical experiment in silico, following the "hot" ground state dynamics for 10 ps after photoexcitation. Using state-of-the-art graphical processing units-enabled electronic structure calculations we performed in total ∼2 ns of nonadiabatic ab initio molecular dynamics discovering (a) critical intermediates that are involved in the open-to-closed transformation, (b) several competing pathways which lower the overall switching yield, and (c) key elements for future design strategies. Our dynamics describe the natural evolution of both the nuclear and electronic degrees of freedom that govern the interconversion between DASA ground-state intermediates, exposing significant elements for future design strategies of molecular switches.
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Affiliation(s)
- David M Sanchez
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States.,Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Umberto Raucci
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States.,Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Todd J Martínez
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States.,Department of Chemistry, Stanford University, Stanford, California 94305, United States
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9
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Volarić J, Szymanski W, Simeth NA, Feringa BL. Molecular photoswitches in aqueous environments. Chem Soc Rev 2021; 50:12377-12449. [PMID: 34590636 PMCID: PMC8591629 DOI: 10.1039/d0cs00547a] [Citation(s) in RCA: 119] [Impact Index Per Article: 39.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Indexed: 12/17/2022]
Abstract
Molecular photoswitches enable dynamic control of processes with high spatiotemporal precision, using light as external stimulus, and hence are ideal tools for different research areas spanning from chemical biology to smart materials. Photoswitches are typically organic molecules that feature extended aromatic systems to make them responsive to (visible) light. However, this renders them inherently lipophilic, while water-solubility is of crucial importance to apply photoswitchable organic molecules in biological systems, like in the rapidly emerging field of photopharmacology. Several strategies for solubilizing organic molecules in water are known, but there are not yet clear rules for applying them to photoswitchable molecules. Importantly, rendering photoswitches water-soluble has a serious impact on both their photophysical and biological properties, which must be taken into consideration when designing new systems. Altogether, these aspects pose considerable challenges for successfully applying molecular photoswitches in aqueous systems, and in particular in biologically relevant media. In this review, we focus on fully water-soluble photoswitches, such as those used in biological environments, in both in vitro and in vivo studies. We discuss the design principles and prospects for water-soluble photoswitches to inspire and enable their future applications.
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Affiliation(s)
- Jana Volarić
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, Faculty for Science and Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
| | - Wiktor Szymanski
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, Faculty for Science and Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
- Department of Radiology, Medical Imaging Center, University of Groningen, University Medical Centre Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Nadja A Simeth
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, Faculty for Science and Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
- Institute for Organic and Biomolecular Chemistry, University of Göttingen, Tammannstr. 2, 37077 Göttingen, Germany
| | - Ben L Feringa
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, Faculty for Science and Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
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10
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Mukhopadhyay S, Sarkar A, Ghoshal S, Sarkar P, Dhara K, Chattopadhyay P. Encapsulation and Stabilization of a Donor-Acceptor Stenhouse Adduct Isomer in Water Inside the Blue Box: A Combined Experimental and Theoretical Approach. J Phys Chem B 2021; 125:7222-7230. [PMID: 34181423 DOI: 10.1021/acs.jpcb.1c03890] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We synthesized two types of donor-acceptor Stenhouse adducts (DASAs), a new type of photochromic molecules showing dual color in two different isomeric forms in solution phase, using Meldrum acid (DASA-Mel) and barbituric acid (DASA-Bar), along with a naphthalimide derivative to obtain interesting fluorescence properties. DASA-Mel was found to have fast photochromic conversion in comparison to DASA-Bar, evident from ultraviolet-visible (UV-vis) and fluorescence spectroscopic studies. The colored form of DASA-Mel was encapsulated inside the water-soluble Stoddart's blue box and became soluble in water much faster than DASA-Bar. Interestingly, the competitive encapsulation experiment showed that DASA-Mel was selectively encapsulated inside the blue box in water whereas DASA-Bar was mostly separated out from the solution after centrifugation, and this phenomenon was confirmed by 1H and DOSY NMR and mass spectroscopies. Moreover, we found through density functional theory (DFT) optimization that the open form of DASA-Mel was more stable during the encapsulation reaction in a water medium in comparison to DASA-Bar. The calculated binding energies of encapsulated DASA-Mel and DASA-Bar are -10.2 and -9.9 kcal/mol, respectively, clearly showing that the former is more stable by 0.3 kcal. Consequently, the organic macrocycle selectively separating one kind of DASA from a mixture by encapsulation in water is reported for the first time with experimental and theoretical support in the literature.
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Affiliation(s)
- Sujay Mukhopadhyay
- Department of Chemistry, The University of Burdwan, Golapbag, Burdwan 713104, West Bengal, India
| | - Arnab Sarkar
- Department of Chemistry, The University of Burdwan, Golapbag, Burdwan 713104, West Bengal, India
| | - Sourav Ghoshal
- Department of Chemistry, Visva-Bharati University, Santiniketan 731235, West Bengal, India
| | - Pranab Sarkar
- Department of Chemistry, Visva-Bharati University, Santiniketan 731235, West Bengal, India
| | - Koushik Dhara
- Department of Chemistry, Sambhu Nath College, Labpur, Birbhum 731303, West Bengal, India
| | - Pabitra Chattopadhyay
- Department of Chemistry, The University of Burdwan, Golapbag, Burdwan 713104, West Bengal, India
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11
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Huang Y, Du Y, Yuan L, Chu Z, He L. Donor-acceptor Stenhouse adducts as new emerging photoswitches: synthesis, light-responsive properties, and applications in polymers science. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2021. [DOI: 10.1080/10601325.2021.1936550] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Yingjie Huang
- School of Chemical Engineering; State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, China
| | - Yiying Du
- School of Chemical Engineering; State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, China
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, China
| | - Ling Yuan
- School of Chemical Engineering; State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, China
| | - Zonglin Chu
- Department of Applied Chemistry, Hunan University, Changsha, China
| | - Lirong He
- School of Chemical Engineering; State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, China
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12
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Martínez-López D, Santamaría-Aranda E, Marazzi M, García-Iriepa C, Sampedro D. π-Bridge Substitution in DASAs: The Subtle Equilibrium between Photochemical Improvements and Thermal Control*. Chemistry 2021; 27:4420-4429. [PMID: 33258498 DOI: 10.1002/chem.202004988] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Indexed: 01/25/2023]
Abstract
Donor-acceptor Stenhouse adducts (DASAs) are playing an outstanding role as innovative and versatile photoswitches. Until now, all the efforts have been spent on modifying the donor and acceptor moieties to modulate the absorption energy and improve the cyclization and reversion kinetics. However, there is a strong dependence on specific structural modifications and a lack of predictive behavior, mostly owing to the complex photoswitching mechanism. Here, by means of a combined experimental and theoretical study, the effect of chemical modification of the π-bridge linking the donor and acceptor moieties is systematically explored, revealing the significant impact on the absorption, photocyclization, and relative stability of the open form. In particular, a position along the π-bridge is found to be the most suited to redshift the absorption while preserving the cyclization. However, thermal back-reaction to the initial isomer is blocked. These effects are explained in terms of an increased acceptor capability offered by the π-bridge substituent that can be modulated. This strategy opens the path toward derivatives with infra-red absorption and a potential anchoring point for further functionalization.
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Affiliation(s)
- David Martínez-López
- Departamento de Química, Centro de Investigación en Síntesis, Química (CISQ), University of La Rioja, Madre de Dios 53, 26006, Logroño, Spain
| | - Eduardo Santamaría-Aranda
- Departamento de Química, Centro de Investigación en Síntesis, Química (CISQ), University of La Rioja, Madre de Dios 53, 26006, Logroño, Spain
| | - Marco Marazzi
- Departamento de Química, Centro de Investigación en Síntesis, Química (CISQ), University of La Rioja, Madre de Dios 53, 26006, Logroño, Spain.,Department of Analytical Chemistry, Physical Chemistry and Chemical, Engineering, Universidad de Alcalá, Ctra. Madrid-Barcelona, km 33,600, 28871, Alcalá de Henares, Madrid, Spain.,Chemical Research Institute "Andrés M. del Río" (IQAR), Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain
| | - Cristina García-Iriepa
- Department of Analytical Chemistry, Physical Chemistry and Chemical, Engineering, Universidad de Alcalá, Ctra. Madrid-Barcelona, km 33,600, 28871, Alcalá de Henares, Madrid, Spain.,Chemical Research Institute "Andrés M. del Río" (IQAR), Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain
| | - Diego Sampedro
- Departamento de Química, Centro de Investigación en Síntesis, Química (CISQ), University of La Rioja, Madre de Dios 53, 26006, Logroño, Spain
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13
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Sroda MM, Stricker F, Peterson JA, Bernal A, Read de Alaniz J. Donor-Acceptor Stenhouse Adducts: Exploring the Effects of Ionic Character. Chemistry 2021; 27:4183-4190. [PMID: 33348446 DOI: 10.1002/chem.202005110] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Indexed: 11/11/2022]
Abstract
The effects of solution-state dielectric and intermolecular interactions on the degree of charge separation provide a route to understanding the switching properties and concentration dependence of donor-acceptor Stenhouse adducts (DASAs). Through solvatochromic analysis of the open-form DASA in conjunction with X-ray diffraction and computational theory, we have analyzed the ionic character of a series of DASAs. First- and third-generation architectures lead to a higher zwitterionic resonance contribution of the open form and a zwitterionic closed form, whereas the second-generation architecture possesses a less charge-separated open form and neutral closed form. This can be correlated with equilibrium control and photoswitching solvent compatibility. As a result of the high contribution of the zwitterionic resonance forms of first- and third-generation DASAs, we were able to control their switching kinetics by means of ion concentration, whereas second-generation DASAs were less affected. Importantly, these results show how the previously reported concentration dependence of DASAs is not universal, and that DASAs with a more hybrid structure in the open form can achieve photoswitching at high concentrations.
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Affiliation(s)
- Miranda M Sroda
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA
| | - Friedrich Stricker
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA
| | - Julie A Peterson
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA
| | - Alexandria Bernal
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA
| | - Javier Read de Alaniz
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA
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14
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Berraud-Pache R, Santamaría-Aranda E, de Souza B, Bistoni G, Neese F, Sampedro D, Izsák R. Redesigning donor-acceptor Stenhouse adduct photoswitches through a joint experimental and computational study. Chem Sci 2021; 12:2916-2924. [PMID: 34164058 PMCID: PMC8179403 DOI: 10.1039/d0sc06575g] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 01/02/2021] [Indexed: 12/03/2022] Open
Abstract
Many studies have recently explored a new class of reversible photoswitching compounds named Donor-Acceptor Stenhouse Adducts (DASAs). Upon light irradiation, these systems evolve from a coloured open-chain to a colourless closed-ring form, while the thermal back-reaction occurs at room temperature. In order to fulfill the requirements for different applications, new molecules with specific properties need to be designed. For instance, shifting the activation wavelength towards the red part of the visible spectrum is of relevance to biological applications. By using accurate computational calculations, we have designed new DASAs and predicted some of their photophysical properties. Starting from well-studied donor and acceptor parts, we have shown that small chemical modifications can lead to substantial changes in both photophysical and photoswitching properties of the resulting DASAs. Furthermore, we have also analysed how these substitutions impact the electronic structure of the systems. Finally, some pertinent candidates have been successfully synthesized and their photoswitching properties have been characterized experimentally.
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Affiliation(s)
- Romain Berraud-Pache
- Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm Platz 1 45470 Mülheim an der Ruhr Germany
- Sorbonne Université, Laboratoire d'Archéologie Moléculaire et Structurale, CNRS UMR 8220, UPMC - Tour 23, 3ème étage Couloir 23-33, BP 225, 4 place Jussieu 75005 Paris France
| | - Eduardo Santamaría-Aranda
- Departamento de Química, Centro de Investigación en Síntesis Química (CISQ), Universidad de La Rioja Madre de Dios 53 E-26006 Logroño Spain
| | | | - Giovanni Bistoni
- Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm Platz 1 45470 Mülheim an der Ruhr Germany
| | - Frank Neese
- Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm Platz 1 45470 Mülheim an der Ruhr Germany
| | - Diego Sampedro
- Departamento de Química, Centro de Investigación en Síntesis Química (CISQ), Universidad de La Rioja Madre de Dios 53 E-26006 Logroño Spain
| | - Róbert Izsák
- Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm Platz 1 45470 Mülheim an der Ruhr Germany
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15
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Ugandi M, Roemelt M. An Ab Initio Computational Study of Electronic and Structural Factors in the Isomerization of Donor-Acceptor Stenhouse Adducts. J Phys Chem A 2020; 124:7756-7767. [PMID: 32845147 DOI: 10.1021/acs.jpca.0c06494] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In this work, the photochemically and thermally induced isomerization of multiple donor-acceptor Stenhouse adducts (DASAs) of the first, second, and third generation is studied by means of state-of-the-art ab initio electronic structure methods leading to new insight into multiple facets of the reaction mechanism. Importantly, prior to any studies of the reaction mechanism, a set of test calculations demonstrate the suitability of the applied ADC(2) and CC2 methods in the present context. An important aspect in this regard is the availability of electronic energies and gradients under implicit consideration of solvent effects. On the basis of calculated reaction energies and barriers as well as a thorough analysis of the wave function compositions, interesting features of the reaction mechanism are deduced. For example, the closed form of second- and third-generation DASAs can be significantly stabilized by π - π interactions between the donor and acceptor termini when certain structural requirements are fulfilled. The central point of this work concerns the delicate balance between neutral and zwitterionic resonance structures that governs the relative barrier height for the crucial C2-C3 and C3-C4 bond rotations. Finally, a set of calculations on yet unreported derivatives highlights how this balance and hence the barrier heights can be tuned through variation of the donor-acceptor strength as well as the solvent polarity.
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Affiliation(s)
- Mihkel Ugandi
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, Bochum D-44780, Germany
| | - Michael Roemelt
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, Bochum D-44780, Germany
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16
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Sanchez DM, Raucci U, Ferreras KN, Martínez TJ. Putting Photomechanical Switches to Work: An Ab Initio Multiple Spawning Study of Donor-Acceptor Stenhouse Adducts. J Phys Chem Lett 2020; 11:7901-7907. [PMID: 32864975 DOI: 10.1021/acs.jpclett.0c02401] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Photomechanical switches are light sensitive molecules capable of transducing the energy of a photon into mechanical work via photodynamics. In this Letter, we present the first atomistic investigation of the photodynamics of a novel class of photochromes called donor-acceptor Stenhouse adducts (DASA) using state-of-the-art ab initio multiple spawning interfaced with state-averaged complete active-space self-consistent field theory. Understanding the Z/E photoisomerization mechanism in DASAs at the molecular level is crucial in designing new derivatives with improved photoswitching capabilities. Our dynamics simulations show that the actinic step consists of competing nonradiative relaxation pathways that collectively contribute to DASAs' low (21% in toluene) photoisomerization quantum yield. Furthermore, we highlight the important role the intramolecular hydrogen bond plays in the selectivity of photoisomerization in DASAs, identifying it as a possible structural element to tune DASA properties. Our fully ab initio simulations reveal the key degrees of freedom involved in the actinic step, paving the way for the rational design of new generations of DASAs with improved quantum yield and efficiency.
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Affiliation(s)
- D M Sanchez
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
- Department of Chemistry and The PULSE Institute, Stanford University, Stanford, California 94305, United States
| | - U Raucci
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
- Department of Chemistry and The PULSE Institute, Stanford University, Stanford, California 94305, United States
| | - K N Ferreras
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
- Department of Chemistry and The PULSE Institute, Stanford University, Stanford, California 94305, United States
| | - Todd J Martínez
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
- Department of Chemistry and The PULSE Institute, Stanford University, Stanford, California 94305, United States
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