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Dong X, Ran X, Hou C, Zhou Z, Wang Z, Zhang T. Theoretical insights into the linker effects on the turn-on fluorescence behaviors in pyridazinone-containing NO probes. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 321:124761. [PMID: 38955069 DOI: 10.1016/j.saa.2024.124761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2024] [Revised: 06/21/2024] [Accepted: 06/28/2024] [Indexed: 07/04/2024]
Abstract
Fluorescent probes with preferred photophysical properties have attracted considerable attention for their advantages in real-time and accurate detection of signalling molecules in living organisms. Nitric oxide (NO) is a ubiquitous cellular messenger closely associated with many physiological and pathological processes. A NO fluorescent probe, PYSNO, based on the pyridazinone (PY) scaffold with o-phenylenediamine as the receptor and thiophene (S) as the linker has been synthesized. Inspired by the experimental guidance, three other dyes (PYSSNO, PYSONO and PYONO) were theoretically designed by replacing the S linker with thieno[3,2-b]thiophene (SS), thieno[3,2-b]thiophene 1,1-dioxide (SO) and thiophene 1,1-dioxide (O) groups. The photophysical properties were theoretically investigated in aqueous solution, by the combined time-dependent density functional theory, polarizable continuum model and thermal vibration correlation function approaches. Our results indicate that the emission wavelengths of all the designed dyes show red shifts due to either an increase in the conjugation length or electron-accepting ability of the linkers compared to PYSNO. The photoinduced electron transfer (PET) processes are all absent in these systems. PYSSNO and PYSONO are theoretically expected to be promising candidates for novel NO fluorescent probes, but the suitability of PYONO as a NO probe is compromised by the predicted non-luminescent emission before and after reaction with NO. Our study not only offers valuable insights into the detailed structure-property relationships, but also opens a new avenue for the rational design of efficient fluorescent sensors for NO detection.
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Affiliation(s)
- Xiaoxu Dong
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, PR China
| | - Xin Ran
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, PR China
| | - Chengshuo Hou
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, PR China
| | - Ziheng Zhou
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, PR China
| | - Zhiming Wang
- AIE Institute, State Key Laboratory of Luminescent Materials and Devices, Center for Aggregation-Induced Emission, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, PR China.
| | - Tian Zhang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, PR China.
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Jiao Y, Dong X, Ran X, Deng Q, Xiao H, Wang Z, Zhang T. Theoretical characterization of two-photon fluorescent probes for nitric oxide detection: sensing mechanism, photophysical properties and protonation effects. Phys Chem Chem Phys 2023; 25:19932-19942. [PMID: 37458714 DOI: 10.1039/d3cp01091k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2023]
Abstract
Nitric oxide (NO) is an important signal molecule in biological systems and is correlated with many physiological processes and pathological diseases. To date, numerous fluorescent probes based on o-diamino aromatics have been designed and synthesized for NO detection utilizing the principle of photoinduced electron transfer (PET). However, the underlying PET mechanism has rarely been validated, and a systematic computational study on the photophysical properties is urgently desired. In this study, we used a theoretical protocol to comparatively investigate the sensing mechanism, photophysical properties and protonation effects of two emblematic probes NINO and PYSNO in aqueous solution, which combines a polarizable continuum model (PCM), time-dependent density functional theory (TD-DFT) and thermal vibration correlation function formalism (TVCF). Our findings reveal that the weak emission of NINO is due to activated PET with negative driving energy and blocked fluorescence with significant charge separation. In contrast, the poor luminescence of PYSNO is caused by the facilitated non-radiative dissipation, even though the fluorescence emission remains unobstructed. Although NINO has been successfully used in two-photon microscopy for detecting NO, we suggest that PYSNO possesses a superior two-photon absorption (TPA) cross section in the near-infrared region. The protonation effects suggest that both probes can function effectively in practical acidic lysosomal environments. Our study opens a new avenue for understanding the mechanism and predicting the properties of two-photon fluorescent probes for NO detection, thus aiding the rational design of efficient fluorescent sensors.
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Affiliation(s)
- Yawen Jiao
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, China.
| | - Xiaoxu Dong
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, China.
| | - Xin Ran
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, China.
| | - Qiyun Deng
- AIE Institute, State Key Laboratory of Luminescent Materials and Devices, Center for Aggregation-Induced Emission, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, China.
| | - Haibin Xiao
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, China.
| | - Zhiming Wang
- AIE Institute, State Key Laboratory of Luminescent Materials and Devices, Center for Aggregation-Induced Emission, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, China.
| | - Tian Zhang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, China.
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Asgarpour Khansary M, Shirazian S, Walker G. A molecularly enhanced proof of concept for targeting cocrystals at molecular scale in continuous pharmaceuticals cocrystallization. Proc Natl Acad Sci U S A 2022; 119:e2114277119. [PMID: 35594395 PMCID: PMC9173768 DOI: 10.1073/pnas.2114277119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 12/09/2021] [Indexed: 11/18/2022] Open
Abstract
It is impossible to optimize a process for a target drug product with the desired profile without a proper understanding of the interplay among the material attributes, the process parameters, and the attributes of the drug product. There is a particular need to bridge the micro- and mesoscale events that occur during this process. Here, we propose а molecular engineering methodology for the continuous cocrystallization process, based on Raman spectra measured experimentally with a probe and from quantum mechanical calculations. Using molecular dynamics simulations, the theoretical Raman spectra were calculated from first principles for local mixture structures under an external shear force at various temperatures. A proof of concept is developed to build the process design space from the computed data. We show that the determined process design space provides valuable insight for optimizing the cocrystallization process at the nanoscale, where experimental measurements are difficult and/or inapplicable. The results suggest that our method may be used to target cocrystallization processes at the molecular scale for improved pharmaceutical synthesis.
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Affiliation(s)
| | - Saeed Shirazian
- Department of Chemical Science, Bernal Institute, University of Limerick, Limerick, V94 T9PX Ireland
| | - Gavin Walker
- Synthesis and Solid State Pharmaceutical Centre, Bernal Institute, University of Limerick, Limerick, V94 T9PX Ireland
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Xu Y, Zhang K, Gao X, Leng J, Fan J. Responsive mechanism of 2-fluoro-5-nitrobenzoate based two-photon fluorescent probes for H 2S n detection: A theoretical perspective. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 250:119244. [PMID: 33281087 DOI: 10.1016/j.saa.2020.119244] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 10/23/2020] [Accepted: 11/14/2020] [Indexed: 06/12/2023]
Abstract
Two-photon fluorescent probes with large two-photon absorption (TPA) cross sections have shown wide applications in biomedical domain. However, both the species and amounts of high efficient probes are far from meeting the requirements, one main reason is that the relationship between the molecular structures and the responsive mechanisms are not clear and theoretical framework in this field is not perfect. In this work, the photophysical properties including one- and two-photon absorption and emission of three newly synthesized fluorescent probes for hydrogen polysulfide (H2Sn) detection are investigated by density functional theory and time-dependent density functional theory with the polarizable continuum model in different solvents. Results indicate that the enhanced fluorescent intensity and enlarged TPA cross section can be found when the probes reacted with H2Sn. Moreover, the OPA intensity is largest and its fluorescent intensity is largely enhanced when detecting H2Sn for Pro2, this verifies its superior performance in the detection of H2Sn than Pro1 and Pro 3. Furthermore, the inner mechanism for the increase of TPA cross section is revealed, the responsive mechanisms for photo induced electron transfer (PET) and fluorescence resonance energy transfer (FRET) processes are revealed through analyzing the energies and distributions of frontier orbitals. Our calculations provide theoretical perspectives for experimental measurements and could sever as a useful reference for developing advanced probes in biomedical fields.
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Affiliation(s)
- Yuanyuan Xu
- School of Science, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
| | - Kai Zhang
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, Institute of Materials and Clean Energy, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
| | - Xingguo Gao
- School of Science, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.
| | - Jiancai Leng
- School of Science, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.
| | - Jianzhong Fan
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, Institute of Materials and Clean Energy, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China.
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Asgarpour Khansary M, Shirazian S, Walker G. Molecular engineering of cocrystallization process in holt melt extrusion based on kinetics of elementary molecular processes. Int J Pharm 2021; 601:120495. [PMID: 33794321 DOI: 10.1016/j.ijpharm.2021.120495] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 03/11/2021] [Accepted: 03/12/2021] [Indexed: 01/15/2023]
Abstract
Continuous co-crystallization in a twin-screw granulator is a promising technology. In order to fundamentally optimize the process flow, it is necessary to investigate the kinetics of molecular interactions within the mixture and the effect of these interactions on co-crystal formation. In this study, the processes governing the co-crystallization of ibuprofen and nicotinamide were considered. Density functional theory calculations employing the Hirshfeld partitioning scheme were used to identify donor-acceptor sites on each molecule. A total of twenty-one different molecular interactions was identified (nine of ibuprofen and nicotinamide (resembling co-crystals), three of ibuprofen and itself (resembling the ibuprofen dimer), and nine of nicotinamide and itself (resembling the nicotinamide dimer)). Each interaction was defined as an artificial reversible reaction and the kinetics were calculated using the transition state theory of chemical reactions, where linear and quadratic synchronous transition methods were utilized to identify transition-state structures; the minimum energy path was determined using the nudged elastic band method. A kinetic Monte Carlo framework was used to study the collective/coupled effect of reactions on the progress of the co-crystallization process. it was found that operating at low temperatures (especially lower or very close to the melting temperature of ibuprofen) for longer residency times creates a safe route for maximizing the presence of ibuprofen and nicotinamide co-crystals. If the proposed route is applied, the purity and properties of the produced co-crystal would be significant, especially its desirable availability within the body.
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Affiliation(s)
| | - Saeed Shirazian
- Department of Chemical Sciences, Bernal Institute, University of Limerick, Limerick, Ireland
| | - Gavin Walker
- Synthesis & Solid-State Pharmaceutical Centre, Bernal Institute, University of Limerick, Limerick, Ireland
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Asgarpour Khansary M, Walker G, Shirazian S. Incomplete cocrystalization of ibuprofen and nicotinamide and its interplay with formation of ibuprofen dimer and/or nicotinamide dimer: A thermodynamic analysis based on DFT data. Int J Pharm 2020; 591:119992. [DOI: 10.1016/j.ijpharm.2020.119992] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2020] [Revised: 10/11/2020] [Accepted: 10/13/2020] [Indexed: 12/20/2022]
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