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Mustafa FM, Abdel Khalek AA, Mahboob AA, Abdel-Latif MK. Designing Efficient Metal-Free Dye-Sensitized Solar Cells: A Detailed Computational Study. Molecules 2023; 28:6177. [PMID: 37687006 PMCID: PMC10488533 DOI: 10.3390/molecules28176177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 08/14/2023] [Accepted: 08/17/2023] [Indexed: 09/10/2023] Open
Abstract
The modulation of molecular characteristics in metal-free organic dyes holds significant importance in dye-sensitized solar cells (DSSCs). The D-π-A molecular design, based on the furan moiety (π) in the conjugated spacer between the arylamine (D) and the 2-cyanoacrylic acid (A), was developed and theoretically evaluated for its potential application in DSSCs. Utilizing linear response time-dependent density functional theory (TDDFT) with the CAM-B3LYP functional, different donor and acceptor groups were characterized in terms of the electronic absorption properties of these dyes. All the studied dye sensitizers demonstrate the ability to inject electrons into the semiconductor's conduction band (TiO2) and undergo regeneration through the redox potential triiodide/iodide (I3-/I-) electrode. TDDFT results indicate that the dyes with CSSH anchoring groups exhibit improved optoelectronic properties compared to other dyes. Further, the photophysical properties of all dyes absorbed on a Ti(OH)4 model were explored and reported. The observed results indicate that bidentate chemisorption occurs between dyes and TiO4H5. Furthermore, the HOMO-LUMO energy gaps for almost all dye complexes are significantly smaller than those of the free dyes. This decrease of the HOMO-LUMO energy gaps in the dye complexes facilitates electron excitation, and thus more photons can be adsorbed, guaranteeing larger values of efficiency and short-circuit current density.
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Affiliation(s)
- Fatma M. Mustafa
- Chemistry Department, Faculty of Science, Beni-Suef University, Beni-Suef City 62521, Egypt; (F.M.M.); (A.A.A.K.)
| | - Ahmed A. Abdel Khalek
- Chemistry Department, Faculty of Science, Beni-Suef University, Beni-Suef City 62521, Egypt; (F.M.M.); (A.A.A.K.)
| | - Abdulla Azzam Mahboob
- Chemistry Department, Collage of Science, United Arab Emirates University, Al-Ain P.O. Box 15551, United Arab Emirates;
| | - Mahmoud K. Abdel-Latif
- Chemistry Department, Faculty of Science, Beni-Suef University, Beni-Suef City 62521, Egypt; (F.M.M.); (A.A.A.K.)
- Chemistry Department, Collage of Science, United Arab Emirates University, Al-Ain P.O. Box 15551, United Arab Emirates;
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2
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Petrovskii S, Petrovskaia A, Sizova A, Sizov V, Grachova E. Homoleptic Alkynylpyridinium Au(I) Complexes as Organometallic 'D-π-A' Chromophores. Chempluschem 2023:e202300155. [PMID: 37235519 DOI: 10.1002/cplu.202300155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 05/25/2023] [Accepted: 05/26/2023] [Indexed: 05/28/2023]
Abstract
A series of terminal acetylenes bearing methylpyridinium acceptor group attached to the alkynyl unit with different π-conjugated aromatic linker have been synthetized. These alkynylpyridinium salts are efficient 'push-pull' chromophores demonstrating bright UV-vis fluorescence with quantum yields up to 70%. The homoleptic bis-alkynyl Au(I) complexes based on these alkynylpyridinium ligands demonstrate complicated photophysical behavior including dual emission in solution. The variation of the linker allows one to tune the intersystem charge transfer and thus to change the electronic and photophysical properties of the organogold 'D-π-A' system. This study demonstrates that absolute and relative intensities of the bands in emission spectra and their energies are responsive to solvent system and anion nature even in case of weakly coordinative anions. TDDFT calculations show that the transitions related to emission of the complex cations are strongly associated with the hybrid MLCT/ILCT charge transfer, thus demonstrating that the complex molecule acts as a unified 'D-π-A' system.
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Affiliation(s)
- Stanislav Petrovskii
- St Petersburg University: Sankt-peterburgskij gosudarstvennyj universitet, Institute of Chemistry, RUSSIAN FEDERATION
| | - Alina Petrovskaia
- St Petersburg University: Sankt-peterburgskij gosudarstvennyj universitet, Institute of Chemistry, RUSSIAN FEDERATION
| | - Anastasia Sizova
- St Petersburg University: Sankt-peterburgskij gosudarstvennyj universitet, Institute of Chemistry, RUSSIAN FEDERATION
| | - Vladimir Sizov
- St Petersburg University: Sankt-peterburgskij gosudarstvennyj universitet, Institute of Chemistry, RUSSIAN FEDERATION
| | - Elena Grachova
- St Petersburg University: Sankt-peterburgskij gosudarstvennyj universitet, Institute of Chemistry, Universitetskii pr., 26, 198504, St.Petersburg, RUSSIAN FEDERATION
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Zhai YJ, Zhou ZZ, Gao LL, Li JN, Pescitelli G, Gao JM, Han WB. Ethylidene-Tethered Chromene-Pyrone Hybrids as Potential Plant-Growth Regulators from an Endolichenic Phaeosphaeria Species. J Agric Food Chem 2023; 71:4615-4624. [PMID: 36945879 DOI: 10.1021/acs.jafc.2c08710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Phaeosphaeria sp., a lichen-associated fungus, produced six skeletally new dimeric spiciferones (1-6) and four known metabolites (7-10). The new structures were elucidated by spectroscopic analysis, and their absolute configurations were determined by electronic circular dichroism calculations. Compounds 1 and 3-6 represent the first examples of ethylidene-bridged dimers from the building blocks 4H-chromene-4,7(8H)-dione and α-pyrone, and 2 is a unique homodimer of spiciferone. Compounds 1, 2, and 5-9 significantly inhibited the growth of weed-like dicot Arabidopsis thaliana at 100.0 μM. Notably, 8 showed the strongest inhibitory activity against the fresh weight and root elongation of A. thaliana with the IC50 values of 32.04 and 26.78 μM, respectively, whereas 1, 8, and 9 stimulated the growth of A. thaliana at lower concentrations. Meanwhile, compounds 2 and 6 exhibited weak inhibitory effects on the root elongation of monocot rice, while 1 and 8 exhibited growth-promoting effects on the shoot and root elongation of rice in a roughly dose-dependent manner.
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Affiliation(s)
- Yi-Jie Zhai
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, Yangling, 712100 Shaanxi, People's Republic of China
| | - Zhen-Zhen Zhou
- Provincial Key Laboratory of Agrobiology and Institute of Germplasm Resources and Biotechnology, Jiangsu Academy of Agricultural Sciences, 210014 Nanjing, China
| | - Lin-Lin Gao
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, Yangling, 712100 Shaanxi, People's Republic of China
| | - Jian-Nan Li
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, Yangling, 712100 Shaanxi, People's Republic of China
| | - Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy
| | - Jin-Ming Gao
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, Yangling, 712100 Shaanxi, People's Republic of China
| | - Wen-Bo Han
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, Yangling, 712100 Shaanxi, People's Republic of China
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Pajuelo-Corral O, Razquin-Bobillo L, Rojas S, García JA, Choquesillo-Lazarte D, Salinas-Castillo A, Hernández R, Rodríguez-Diéguez A, Cepeda J. Lanthanide(III) Ions and 5-Methylisophthalate Ligand Based Coordination Polymers: An Insight into Their Photoluminescence Emission and Chemosensing for Nitroaromatic Molecules. Nanomaterials (Basel) 2022; 12:3977. [PMID: 36432263 PMCID: PMC9694308 DOI: 10.3390/nano12223977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 11/05/2022] [Accepted: 11/09/2022] [Indexed: 06/16/2023]
Abstract
The work presented herein reports on the synthesis, structural and physico-chemical characterization, luminescence properties and luminescent sensing activity of a family of isostructural coordination polymers (CPs) with the general formula [Ln2(μ4-5Meip)3(DMF)]n (where Ln(III) = Sm (1Sm), Eu (2Eu), Gd (3Gd), Tb (4Tb) and Yb (5Yb) and 5Meip = 5-methylisophthalate, DMF = N,N-dimethylmethanamide). Crystal structures consist of 3D frameworks tailored by the linkage between infinite lanthanide(III)-carboxylate rods by means of the tetradentate 5Meip ligands. Photoluminescence measurements in solid state at variable temperatures reveal the best-in-class properties based on the capacity of the 5Meip ligand to provide efficient energy transfers to the lanthanide(III) ions, which brings intense emissions in both the visible and near-infrared (NIR) regions. On the one hand, compound 5Yb displays characteristic lanthanide-centered bands in the NIR with sizeable intensity even at room temperature. Among the compounds emitting in the visible region, 4Tb presents a high QY of 63%, which may be explained according to computational calculations. At last, taking advantage of the good performance as well as high chemical and optical stability of 4Tb in water and methanol, its sensing capacity to detect 2,4,6-trinitrophenol (TNP) among other nitroaromatic-like explosives has been explored, obtaining high detection capacity (with Ksv around 105 M-1), low limit of detection (in the 10-6-10-7 M) and selectivity among other molecules (especially in methanol).
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Affiliation(s)
- Oier Pajuelo-Corral
- Departamento de Química Aplicada, Facultad de Química, Universidad del País Vasco (UPV/EHU), 20018 Donostia, Spain
| | - Laura Razquin-Bobillo
- Departamento de Química Aplicada, Facultad de Química, Universidad del País Vasco (UPV/EHU), 20018 Donostia, Spain
| | - Sara Rojas
- Departamento de Química Inorgánica, UEQ, C/Severo Ochoa s/n, University of Granada, 18071 Granada, Spain
| | - Jose Angel García
- Departamento de Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU), 48940 Leioa, Spain
| | - Duane Choquesillo-Lazarte
- Laboratorio de Estudios Cristalográficos, IACT, CSIC-Universidad de Granada, Avda. de las Palmeras 4, 18100 Armilla, Spain
| | - Alfonso Salinas-Castillo
- Departamento de Química Analítica, C/Severo Ochoa s/n, University of Granada, 18071 Granada, Spain
| | - Ricardo Hernández
- Departamento de Química Aplicada, Facultad de Química, Universidad del País Vasco (UPV/EHU), 20018 Donostia, Spain
| | - Antonio Rodríguez-Diéguez
- Departamento de Química Inorgánica, UEQ, C/Severo Ochoa s/n, University of Granada, 18071 Granada, Spain
| | - Javier Cepeda
- Departamento de Química Aplicada, Facultad de Química, Universidad del País Vasco (UPV/EHU), 20018 Donostia, Spain
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Guo L, Yang Q, Wang G, Zhang S, Liu M, Pan X, Pescitelli G, Xie Z. Ring D-Modified and Highly Reduced Angucyclinones From Marine Sediment-Derived Streptomyces sp. Front Chem 2021; 9:756962. [PMID: 34712650 PMCID: PMC8546756 DOI: 10.3389/fchem.2021.756962] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Accepted: 09/02/2021] [Indexed: 11/28/2022] Open
Abstract
Angucyclines and angucyclinones represent the largest family of type II PKS-engineered natural products. Chemical analysis of a marine Streptomyces sp. KCB-132 yielded three new members, actetrophenone A (1) and actetrophenols A–B (2–3). Their structures were elucidated by NMR spectroscopy, X-ray crystallography and CD calculations. Actetrophenone A (1) is the first representative of a novel-type angucyclinone bearing a nonaromatic D-ring. Actetrophenol A (2) features a highly reduced and aromatized four-ring system, which is unprecedented for natural products. While (Ra)- and (Sa)-actetrophenol B (3) bear an unprecedented N-acetyltryptamine-substituted tetraphene core skeleton, this is the first report of a pair of atropisomeric isomers in the angucyclinone family. Actetrophenol A (2) exhibits remarkable antibiotic activity, notably including potent activity to multiple resistant Staphylococcus aureus and Enterococcus faecium with MIC values of 4 μg/ml, in contrast, the positive control antimicrobial agent penicillin was inactive up to 32 μg/ml.
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Affiliation(s)
- Lin Guo
- School of Pharmacy, Binzhou Medical University, Yantai, China
| | - Qiaoli Yang
- College of Life Sciences, Yantai University, Yantai, China
| | - Guangfei Wang
- College of Life Sciences, Yantai University, Yantai, China
| | - Shumin Zhang
- School of Pharmacy, Binzhou Medical University, Yantai, China
| | - Ming Liu
- School of Pharmacy, Binzhou Medical University, Yantai, China
| | - Xiaohong Pan
- School of Pharmacy, Binzhou Medical University, Yantai, China
| | - Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy
| | - Zeping Xie
- School of Pharmacy, Binzhou Medical University, Yantai, China
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6
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Pescitelli G. For a Correct Application of the CD Exciton Chirality Method: The Case of Laucysteinamide A. Mar Drugs 2018; 16:E388. [PMID: 30332852 PMCID: PMC6213868 DOI: 10.3390/md16100388] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 10/10/2018] [Accepted: 10/15/2018] [Indexed: 12/15/2022] Open
Abstract
The circular dichroism (CD) exciton chirality method (ECM) is a very popular approach for assigning the absolute configuration (AC) of natural products, thanks to its immediacy and ease of application. The sign of an exciton couplet (two electronic CD bands with opposite sign and similar intensity) can be directly correlated with the molecular stereochemistry, including the AC. However, a correct application of the ECM necessitates several prerequisites: knowledge of the molecular conformation; knowledge of transition moment direction; and preeminence of the exciton coupling mechanism with respect to other sources of CD signals. In recent years, by using quantum-chemical CD calculations, we have demonstrated that some previous applications of ECM were wrong or based on incorrect assumptions. In a recent publication of this journal (Mar. Drugs, 2017, 15(4), 121), the ECM was employed to assign the AC of a marine metabolite, laucysteinamide A. This is a further case of incorrect application of the method, where none of the aforementioned prerequisites is fully met. Using this example, we will discuss the criteria required for a correct application of the ECM.
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Affiliation(s)
- Gennaro Pescitelli
- Department of Chemistry and Industrial Chemistry, University of Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy.
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Zhang J, Hong H, Lian C, Ma W, Xu X, Zhou X, Fu H, Liu K, Meng S. Interlayer-State-Coupling Dependent Ultrafast Charge Transfer in MoS 2/WS 2 Bilayers. Adv Sci (Weinh) 2017; 4:1700086. [PMID: 28932669 PMCID: PMC5604380 DOI: 10.1002/advs.201700086] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 03/24/2017] [Indexed: 05/05/2023]
Abstract
Light-induced interlayer ultrafast charge transfer in 2D heterostructures provides a new platform for optoelectronic and photovoltaic applications. The charge separation process is generally hypothesized to be dependent on the interlayer stackings and interactions, however, the quantitative characteristic and detailed mechanism remain elusive. Here, a systematical study on the interlayer charge transfer in model MoS2/WS2 bilayer system with variable stacking configurations by time-dependent density functional theory methods is demonstrated. The results show that the slight change of interlayer geometry can significantly modulate the charge transfer time from 100 fs to 1 ps scale. Detailed analysis further reveals that the transfer rate in MoS2/WS2 bilayers is governed by the electronic coupling between specific interlayer states, rather than the interlayer distances, and follows a universal dependence on the state-coupling strength. The results establish the interlayer stacking as an effective freedom to control ultrafast charge transfer dynamics in 2D heterostructures and facilitate their future applications in optoelectronics and light harvesting.
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Affiliation(s)
- Jin Zhang
- Beijing National Laboratory for Condensed Matter Physics, and Institute of PhysicsChinese Academy of SciencesBeijing100190P. R. China
- School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing100049P. R. China
| | - Hao Hong
- State Key Laboratory for Mesoscopic PhysicsSchool of PhysicsPeking UniversityBeijing100871P. R. China
| | - Chao Lian
- Beijing National Laboratory for Condensed Matter Physics, and Institute of PhysicsChinese Academy of SciencesBeijing100190P. R. China
| | - Wei Ma
- Beijing National Laboratory for Condensed Matter Physics, and Institute of PhysicsChinese Academy of SciencesBeijing100190P. R. China
- School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing100049P. R. China
| | - Xiaozhi Xu
- State Key Laboratory for Mesoscopic PhysicsSchool of PhysicsPeking UniversityBeijing100871P. R. China
| | - Xu Zhou
- State Key Laboratory for Mesoscopic PhysicsSchool of PhysicsPeking UniversityBeijing100871P. R. China
| | - Huixia Fu
- Beijing National Laboratory for Condensed Matter Physics, and Institute of PhysicsChinese Academy of SciencesBeijing100190P. R. China
- School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing100049P. R. China
| | - Kaihui Liu
- State Key Laboratory for Mesoscopic PhysicsSchool of PhysicsPeking UniversityBeijing100871P. R. China
- Collaborative Innovation Center of Quantum MatterBeijing100190P. R. China
| | - Sheng Meng
- Beijing National Laboratory for Condensed Matter Physics, and Institute of PhysicsChinese Academy of SciencesBeijing100190P. R. China
- School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing100049P. R. China
- Collaborative Innovation Center of Quantum MatterBeijing100190P. R. China
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Abstract
Photodecomposition of bromophenols (BPs) represents a potent channel of debromination and elimination of these species in the environment. From this perspective, the present contribution reports geometrical parameters, electronic absorption spectra and excited states of the complete series of BPs in their ground state (S0), as well as their first singlet exited state (S1). We calculate excitation energies for S0 → S1 transition within the framework of the time-dependent density functional theory (TDDFT). We estimate and discuss charges on bromine atoms and HOMO-LUMO energy gaps (E(H-L)) as molecular descriptors for the photoreactivity of BPs and photo-induced debromination mechanism of BPs. Spectral patterns reveal that, as the degree of bromination increases, peaks of absorption spectra red-shift toward wavelengths near 300 nm, for the pentabrominated phenol. Based on the analysis of optimised geometries and Hirshfeld's atomic charges, photodebromination of BPs commences via the loss of an ortho Br atom. The excitation energies decrease linearly with increasing number of bromine atoms. This indicates that, higher brominated congeners of BPs photodecompose more readily than lower brominated congeners.
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Affiliation(s)
- Anam Saeed
- School of Engineering and Information Technology, Murdoch University, 90 South Street, Murdoch, WA 6150, Australia
| | - Mohammednoor Altarawneh
- School of Engineering and Information Technology, Murdoch University, 90 South Street, Murdoch, WA 6150, Australia.
| | - Bogdan Z Dlugogorski
- School of Engineering and Information Technology, Murdoch University, 90 South Street, Murdoch, WA 6150, Australia
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Stončius S, Neniškis A, Loganathan N, Wendt OF. Synthesis, molecular structure, and chiroptical properties of dibenzylidene derivatives of bicyclo[3.3.1]nonane and brexane. Chirality 2015; 27:728-37. [PMID: 26415852 DOI: 10.1002/chir.22480] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 05/28/2015] [Indexed: 11/08/2022]
Abstract
Synthesis of several enantiomerically pure unsaturated bicyclo[3.3.1]nonane and related brexane (tricyclo[4.3.0.0(3,7) ]nonane) derivatives bearing exocyclic benzylidene substituents from readily available (+)-(1S,5S)-bicyclo[3.3.1]nonane-2,6-dione was accomplished. Molecular geometry and chiroptical properties of compounds with enone and styrene chromophores were studied by X-ray diffraction analysis, molecular modeling, and circular dichroism (CD) spectroscopy. Difunctional 3,7-dibenzylidenebicyclo[3.3.1]nonanes, such as and , exhibited intense CD couplets, arising from the exciton coupling between the two unsaturated chromophores. The observed negative sign of the exciton couplets is congruent with the negative twist (negative chirality) defined by the two interacting transition dipoles. The sign of the Cotton effect corresponding to the π→π* transitions in the CD spectra of monoenone and tricyclic brexane acetate was correlated with the intrinsic dissymmetry (helicity) of the styrene chromophore.
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Affiliation(s)
- Sigitas Stončius
- Department of Organic Chemistry, Vilnius University, Vilnius, Lithuania
| | - Algirdas Neniškis
- Department of Organic Chemistry, Vilnius University, Vilnius, Lithuania
| | - Nagarajan Loganathan
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, Lund, Sweden
| | - Ola F Wendt
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, Lund, Sweden
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Andrade MS, Silva VS, Lourenço AM, Lobo AM, Rzepa HS. Chiroptical properties of streptorubin B: the synergy between theory and experiment. Chirality 2015; 27:745-51. [PMID: 26316261 DOI: 10.1002/chir.22486] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Revised: 05/18/2015] [Accepted: 07/02/2015] [Indexed: 11/06/2022]
Abstract
Analysis of the calculated and measured optical rotation (OR) together with other calculated chiroptical properties such as electronic circular dichroism (ECD) and vibrational circular dichroism (VCD) of the prodigiosin alkaloid streptorubin B shows that these are dominated by the pseudoenantiomeric atropisomers anti-(S)-streptorubin B (1A) and syn-(S)-streptorubin (1B). Atropisomerism is a dynamic phenomenon with a potentially nonequilibrium population of isomers, and accordingly the measured chiroptical responses may vary with time, concentration, temperature, and the anion of the salts used. Streptorubin also has the potential to form stacked homodimers for which the optical rotations measured at 589 nm can vary greatly due to the presence of ECD-active electronic transitions in this region.
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Affiliation(s)
- Marta S Andrade
- Department of Chemistry, REQUIMTE/LAQV, Faculty of Sciences and Technology, Universidade NOVA de Lisboa, Caparica, Portugal
| | - Vanessa S Silva
- Department of Chemistry, REQUIMTE/LAQV, Faculty of Sciences and Technology, Universidade NOVA de Lisboa, Caparica, Portugal
| | - Ana M Lourenço
- Department of Chemistry, REQUIMTE/LAQV, Faculty of Sciences and Technology, Universidade NOVA de Lisboa, Caparica, Portugal
| | - Ana M Lobo
- Department of Chemistry, REQUIMTE/LAQV, Faculty of Sciences and Technology, Universidade NOVA de Lisboa, Caparica, Portugal
| | - Henry S Rzepa
- Department of Chemistry, Imperial College London, South Kensington Campus, Exhibition Road, London, UK
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Jorge FE, Jorge SS, Suave RN. Electronic circular dichroism of chiral alkenes: B3LYP and CAM-B3LYP calculations. Chirality 2014; 27:23-31. [PMID: 25283773 DOI: 10.1002/chir.22384] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Accepted: 08/02/2014] [Indexed: 11/07/2022]
Abstract
Time-dependent density functional theory (TDDFT) calculations of electronic circular dichroism (ECD) are widely used to determine absolute configurations (ACs) of chiral molecules. Two very popular DFT exchange-correlation functionals, one hybrid (B3LYP) and one long-range corrected (CAM-B3LYP), along with a hierarchical sequence of basis sets were investigated, and the ECD spectra predicted for eight alkenes and compared to gas-phase experimental spectra. Little variation in predicted ECD spectra was found with the basis set size enlargement, but the sensitivity to the functional is greater. Good agreement was obtained only with the CAM-B3LYP functional, leading to the conclusion that TDDFT calculations of ECD spectra can routinely provide reliable ACs if and only if an appropriate functional is used. For camphene, twistene, syn-(E)-bisfenchylidene, and phyllocladene, solvent effects were estimated.
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Affiliation(s)
- Francisco E Jorge
- Departamento de Física, Universidade Federal do Espírito Santo, Vitória, Brazil
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