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Dobšíková K, Taušová T, Fagan P, Paškanová N, Kuchař M, Čejka J, Setnička V. Solid-state vibrational circular dichroism: Methodology and application for amphetamine derivatives. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 305:123486. [PMID: 37820493 DOI: 10.1016/j.saa.2023.123486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 09/22/2023] [Accepted: 10/01/2023] [Indexed: 10/13/2023]
Abstract
Amphetamine derivatives are considered most seized substances worldwide. In this study, solid-state vibrational circular dichroism (VCD) measurements of enantiomerically pure substances were performed for spectroscopic discrimination between (S)- and (R)-enantiomers. First, we have developed a universal experimental approach to obtain reliable and reproducible solid-state VCD spectra. First, the samples were prepared as pellets composed of mixtures of camphor as a model compound and a crystalline matrix powder. In order to obtain the best results without artifacts and with a maximum signal-to-noise ratio, the following experimental conditions were optimized: pellet thickness and diameter and sample rotation speed. The optimized parameters were then used for the analysis of amphetamine and its derivatives (methamphetamine and 3,4-methylendioxymethamphetamine). Our high-quality spectra and results suggest that solid-state VCD spectroscopy represents a cost-effective and easy-to-use method for the analysis of conformation changes and molecular packing in solid-state with potential applications in pharmaceutical and forensic practice.
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Affiliation(s)
- K Dobšíková
- Department of Analytical Chemistry, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic
| | - T Taušová
- Department of Analytical Chemistry, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic
| | - P Fagan
- Department of Analytical Chemistry, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic
| | - N Paškanová
- Forensic Laboratory of Biologically Active Substances, Department of Chemistry of Natural Compounds, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic
| | - M Kuchař
- Forensic Laboratory of Biologically Active Substances, Department of Chemistry of Natural Compounds, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic; Psychedelic Research Centre, National Institute of Mental Health, Topolová 748, Klecany 250 67, Czech Republic
| | - J Čejka
- Department of Solid State Chemistry, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic
| | - V Setnička
- Department of Analytical Chemistry, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic.
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2
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Shedding Light on Degradation Gradients in Celluloid: An ATR-FTIR Study of Artificially and Naturally Aged Specimens. Polymers (Basel) 2023; 15:polym15030522. [PMID: 36771825 PMCID: PMC9920386 DOI: 10.3390/polym15030522] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 01/13/2023] [Accepted: 01/17/2023] [Indexed: 01/21/2023] Open
Abstract
Celluloid artifacts are known by conservation professionals to be prone to degradation, threatening their own integrity and that of nearby heritage collections. Celluloid alteration can have a heterogeneous nature, and this research topic is still in its infancy for heritage science. This article investigates degradation gradients, both along depth and width, of artificially aged celluloid sheets, and compares them to three-dimensional (3D) historical objects with the aim of gaining a better insight into the nature and evolution of their decay. ATR-FTIR was used to systematically study different sampling points of the artificially and naturally aged specimens and allowed us to recognize better-preserved surfaces and more deteriorated cores. ATR-FTIR was found suitable for assessing the molecular changes induced by degradation, particularly denitration and formation of carbonyl-containing degradation products in severely aged specimens. Even though the severely artificially aged sheets displayed unusual alteration phenomena, they present a degradation gradient similar to the one observed for the naturally aged 3D objects under study. This research underlines that sampling at different depths and/or widths is relevant for characterizing the heterogeneity of degraded celluloid, and further investigation with chromatographic techniques would greatly benefit the understanding of the complex degradation of celluloid artifacts.
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3
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Weirich L, Merten C. Induced VCD and conformational chirality in host-guest complexes of a chiral ammonium salt with crown ethers. Phys Chem Chem Phys 2021; 23:18300-18307. [PMID: 34114592 DOI: 10.1039/d1cp01846a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The hydrogen bonded complexes of the chiral ammonium salt α-methylbenzyl ammonium chloride (MBA-H+Cl-) and the achiral crown ethers 18c6 and 15c5 serve as model systems to investigate the effect of host-guest complex formation on the conformational preferences of the macrocycles. We demonstrate that the intermolecular interactions result in new VCD signatures, that can be assigned to vibrational modes of the crown ethers. Based on a detailed conformational analysis, we investigate the origin of these signatures and discuss induced VCD (iVCD) and conformational chirality as possible sources of VCD intensity. The macrocycle in the MBA-H+/18c6 complex prefers either an achiral D3d-symmetric conformation, which gives rise to iVCD, or chiral conformations, that feature individual contributions to the VCD spectrum. For the MBA-H+/15c5 complex, the contributions of the macrocycle to the VCD signatures are less pronounced and found to arise solely from conformational chirality. Therefore, analysis of the VCD signatures confirms that the small chiral guest molecule is able to affect the conformational preferences of a macrocyclic host. The study thus demonstrates the suitability of VCD spectroscopy for the characterization of analogous supramolecular host-guest complexes.
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Affiliation(s)
- Luisa Weirich
- Ruhr-Universität Bochum, Fakultät für Chemie und Biochemie, Organische Chemie II, Universitätsstraße 150, 44801 Bochum, Germany.
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4
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Yang Y, Cheramy J, Xu Y. Matrix Isolation-Vibrational Circular Dichroism Spectroscopic Study of Conformations and Non-Covalent Interactions of Tetrahydro-2-Furoic Acid. Chemphyschem 2021; 22:1336-1343. [PMID: 33945674 DOI: 10.1002/cphc.202100256] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 05/01/2021] [Indexed: 11/10/2022]
Abstract
The conformational landscape and aggregation behaviour of tetrahydro-2-furoic acid (THFA) were investigated by using matrix isolation-vibrational circular dichroism (MI-VCD). The well-resolved experimental MI-IR and MI-VCD features in an argon matrix at 10 K allow one to identify two dominant monomeric conformations as trans-THFA where the hydroxyl and carbonyl groups of COOH are at opposite sides, as well as one cis-conformer. At 24 K and 30 K deposition temperatures, the experimental IR and VCD spectral features reveal further growth of the binary THFA aggregates. Systematic conformational searches identified three vastly different binary binding topologies, resulting in a few hundred stable (THFA)2 conformers. Interestingly, the main binary structures observed correspond to an unusual type of structure which is made of two trans-THFA subunits, in contrast to the usual double H-bonded ring binary structures, identified in a previous solution study. The present work showcases the power of MI-VCD spectroscopy in revealing unusual structures formed in a cold rare gas matrix.
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Affiliation(s)
- Yanqing Yang
- Chemistry Department, University of Alberta Edmonton, Alberta, Canada, T6G 2G2
| | - Joseph Cheramy
- Chemistry Department, University of Alberta Edmonton, Alberta, Canada, T6G 2G2
| | - Yunjie Xu
- Chemistry Department, University of Alberta Edmonton, Alberta, Canada, T6G 2G2
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5
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Pelliccioli V, Franzini R, Mazzeo G, Villani C, Abbate S, Longhi G, Licandro E, Cauteruccio S. Chiral bis(benzo[1,2- b:4,3- b′]dithiophene) atropisomers: experimental and theoretical investigations of the stereochemical and chiroptical properties. NEW J CHEM 2021. [DOI: 10.1039/d1nj03248h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Conformational chirality is a feature that may arise from the presence of a hindered rotation around a single bond that corresponds to a stereogenic axis.
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Affiliation(s)
- Valentina Pelliccioli
- Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, I-20133 Milan, Italy
| | - Roberta Franzini
- Dipartimento di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, P.le A. Moro 5, 00185 Roma, Italy
| | - Giuseppe Mazzeo
- Dipartimento di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Claudio Villani
- Dipartimento di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, P.le A. Moro 5, 00185 Roma, Italy
| | - Sergio Abbate
- Dipartimento di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy
- Istituto Nazionale di Ottica (INO), CNR, Research Unit of Brescia, c/o CSMT, via Branze 45, 25123 Brescia, Italy
| | - Giovanna Longhi
- Dipartimento di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy
- Istituto Nazionale di Ottica (INO), CNR, Research Unit of Brescia, c/o CSMT, via Branze 45, 25123 Brescia, Italy
| | - Emanuela Licandro
- Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, I-20133 Milan, Italy
| | - Silvia Cauteruccio
- Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, I-20133 Milan, Italy
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6
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Ghidinelli S, Abbate S, Boiadjiev SE, Lightner DA, Longhi G. l-Stercobilin-HCl and d-Urobilin-HCl. Analysis of Their Chiroptical and Conformational Properties by VCD, ECD, and CPL Experiments and MD and DFT Calculations. J Phys Chem B 2018; 122:12351-12362. [DOI: 10.1021/acs.jpcb.8b07954] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Simone Ghidinelli
- Dipartimento di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Sergio Abbate
- Dipartimento di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Stefan E. Boiadjiev
- Department of Chemistry and Biochemistry, Medical University-Pleven, 1 St. Kl. Ohridski Str., 5800 Pleven, Bulgaria
| | - David A. Lightner
- Department of Chemistry, University of Nevada, Reno, 1664 North Virginia Street, Reno, 89557-0020 Nevada, United States
| | - Giovanna Longhi
- Dipartimento di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy
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7
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Quesada-Moreno MM, Virgili A, Monteagudo E, Claramunt RM, Avilés-Moreno JR, López-González JJ, Alkorta I, Elguero J. A vibrational circular dichroism (VCD) methodology for the measurement of enantiomeric excess in chiral compounds in the solid phase and for the complementary use of NMR and VCD techniques in solution: the camphor case. Analyst 2018; 143:1406-1416. [PMID: 29457166 DOI: 10.1039/c7an01855j] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
For the first time, the success of a methodology for the determination of enantiomeric excess (% ee) in chiral solid samples by vibrational circular dichroism (VCD) spectroscopy is reported. We have used camphor to determine the % ee in a blind sample constituted by a mixture of its two enantiomers as a test for the validity of our approach. IR and VCD spectra of different enantiomeric mixtures of R/S-camphor in Nujol mulls were recorded and linear regressions of VCD intensities (ΔAbs.) vs. % ee for selected bands were found. Finally, the VCD intensities of a blind sample were interpolated in these linear regressions, obtaining its % ee with a rms of 2.4. These results in the solid phase were complemented with the determination of % ee in the liquid phase by VCD and NMR techniques, which are proved to be complementary techniques to carry out this kind of analysis. In the same way as in the VCD solid phase, linear regressions of ΔAbs. vs. % ee for selected bands were established, obtaining a rms of 1.1 in the % ee determination of a blind sample. 1H NMR experiments at 600 MHz using the chiral solvating agent, (S,S)-ABTE, allow the determination of the proportions of enantiomers in CD2Cl2 solution with great accuracy. 13C CPMAS NMR spectra prove that this technique cannot be used for conglomerates and/or solid solutions.
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Affiliation(s)
- María Mar Quesada-Moreno
- Grupo de Investigación Química Física Teórica y Experimental (FQM-173), Departamento de Química Física y Analítica, Facultad de Ciencias Experimentales, Universidad de Jaén, Campus de Las Lagunillas, E-23071 Jaén, Spain.
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8
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Mazzeo G, Longhi G, Corless VB, Zajdlik A, Yudin AK, Abbate S. Vibrational Circular Dichroism Unveils Chiroptical, Electrical, and Magnetic Properties of Borylated Isocyanides and Aldehydes. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Giuseppe Mazzeo
- Dipartimento di Medicina Molecolare e Traslazionale; Università di Brescia; Viale Europa 11 25123 Brescia Italy
| | - Giovanna Longhi
- Dipartimento di Medicina Molecolare e Traslazionale; Università di Brescia; Viale Europa 11 25123 Brescia Italy
| | - Victoria B. Corless
- Davenport Research Laboratories; Department of Chemistry; University of Toronto; 80 St. George St. M5S 3H6 Toronto ON Canada
| | - Adam Zajdlik
- Davenport Research Laboratories; Department of Chemistry; University of Toronto; 80 St. George St. M5S 3H6 Toronto ON Canada
| | - Andrei K. Yudin
- Davenport Research Laboratories; Department of Chemistry; University of Toronto; 80 St. George St. M5S 3H6 Toronto ON Canada
| | - Sergio Abbate
- Dipartimento di Medicina Molecolare e Traslazionale; Università di Brescia; Viale Europa 11 25123 Brescia Italy
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9
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The role of chirality in a set of key intermediates of pharmaceutical interest, 3-aryl-substituted-γ-butyrolactones, evidenced by chiral HPLC separation and by chiroptical spectroscopies. J Pharm Biomed Anal 2017; 144:41-51. [PMID: 28118957 DOI: 10.1016/j.jpba.2017.01.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 12/14/2016] [Accepted: 01/04/2017] [Indexed: 11/20/2022]
Abstract
The enantiomers of four chiral 3-aryl-substituted-γ-butyrolactones, key intermediates for the preparation of compounds of pharmaceutical interest, were successfully isolated by enantioselective chromatography, employing the Chiralpak AD-H chiral stationary phase. For all compounds the same elution order was observed, as monitored by a full set of chiroptical methods that we employed, namely ORD (optical rotatory dispersion), ECD (electronic circular dichroism, or CD in the UV range), and VCD (vibrational circular dichroism, or CD in the IR range). By density functional theory (DFT) calculations we were able to determine that the first eluted enantiomer has (S) absolute configuration in all four cases. We were able to justify the elution order by molecular docking calculations for all four enantiomeric pairs and suitable modeling of the stationary and mobile phases of the employed columns. The optimal performance of the chiroptical spectroscopies and of the DFT calculations allows us to formulate a lactone chirality rule out of the CO stretching region of the VCD spectra.
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10
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Citti C, Battisti UM, Ciccarella G, Maiorano V, Gigli G, Abbate S, Mazzeo G, Castiglioni E, Longhi G, Cannazza G. Analytical and preparative enantioseparation and main chiroptical properties of Iridium(III) bis(4,6-difluorophenylpyridinato)picolinato. J Chromatogr A 2016; 1467:335-346. [DOI: 10.1016/j.chroma.2016.05.059] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Revised: 05/09/2016] [Accepted: 05/17/2016] [Indexed: 12/17/2022]
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11
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Mazzeo G, Abbate S, Longhi G, Castiglioni E, Boiadjiev SE, Lightner DA. pH Dependent Chiroptical Properties of (1R,2R)- and (1S,2S)-trans-Cyclohexane Diesters and Diamides from VCD, ECD, and CPL Spectroscopy. J Phys Chem B 2016; 120:2380-7. [DOI: 10.1021/acs.jpcb.5b11223] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Giuseppe Mazzeo
- Dipartimento
di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Sergio Abbate
- Dipartimento
di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy
- CNISM, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Via della Vasca
Navale, 84, 00146 Roma, Italy
| | - Giovanna Longhi
- Dipartimento
di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy
- CNISM, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Via della Vasca
Navale, 84, 00146 Roma, Italy
| | - Ettore Castiglioni
- Dipartimento
di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy
- JASCO Europe, Via Cadorna 1, 23894 Cremella, LC, Italy
| | - Stefan E. Boiadjiev
- Department
of Chemistry and Biochemistry, Medical University-Pleven, 1 St. Kl. Ohridski Str., 5800 Pleven, Bulgaria
| | - David A. Lightner
- Department
of Chemistry, University of Nevada, Reno, Nevada 89557-0020, United States
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12
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Said MEA, Vanloot P, Bombarda I, Naubron JV, Dahmane EM, Aamouche A, Jean M, Vanthuyne N, Dupuy N, Roussel C. Analysis of the major chiral compounds of Artemisia herba-alba essential oils (EOs) using reconstructed vibrational circular dichroism (VCD) spectra: En route to a VCD chiral signature of EOs. Anal Chim Acta 2016; 903:121-30. [DOI: 10.1016/j.aca.2015.11.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 10/21/2015] [Accepted: 11/05/2015] [Indexed: 02/07/2023]
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13
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Mazzeo G, Fusè M, Longhi G, Rimoldi I, Cesarotti E, Crispini A, Abbate S. Vibrational circular dichroism and chiroptical properties of chiral Ir(iii) luminescent complexes. Dalton Trans 2016; 45:992-9. [DOI: 10.1039/c5dt03642a] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three chiroptical spectroscopic techniques are applied to an octahedral iridium complex. The vibrational exciton interpretation of VCD spectra is especially important.
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Affiliation(s)
- Giuseppe Mazzeo
- Dipartimento di Medicina Molecolare e Traslazionale
- Università di Brescia
- 25123 Brescia
- Italy
| | - Marco Fusè
- Dipartimento di Scienze Farmaceutiche
- Università di Milano
- 20133 Milano
- Italy
| | - Giovanna Longhi
- Dipartimento di Medicina Molecolare e Traslazionale
- Università di Brescia
- 25123 Brescia
- Italy
- CNISM Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia
| | - Isabella Rimoldi
- Dipartimento di Scienze Farmaceutiche
- Università di Milano
- 20133 Milano
- Italy
| | - Edoardo Cesarotti
- Dipartimento di Scienze Farmaceutiche
- Università di Milano
- 20133 Milano
- Italy
| | - Alessandra Crispini
- MAT_INLAB (Laboratorio di Materiali Molecolari Inorganici) (Unità della Calabria
- Dipartimento di Chimica e Tecnologie Chimiche) University of Calabria
- I-87030 Arcavacata di Rende
- Italy
| | - Sergio Abbate
- Dipartimento di Medicina Molecolare e Traslazionale
- Università di Brescia
- 25123 Brescia
- Italy
- CNISM Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia
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14
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Mazzeo G, Abbate S, Longhi G, Castiglioni E, Villani C. Vibrational Circular Dichroism (VCD) Reveals Subtle Conformational Aspects and Intermolecular Interactions in the Carnitine Family. Chirality 2015; 27:907-13. [PMID: 26447810 DOI: 10.1002/chir.22532] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 08/24/2015] [Accepted: 08/25/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Giuseppe Mazzeo
- Dipartimento di Medicina Molecolare e Traslazionale; Università di Brescia; Brescia Italy
| | - Sergio Abbate
- Dipartimento di Medicina Molecolare e Traslazionale; Università di Brescia; Brescia Italy
- CNISM Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia; Roma Italy
| | - Giovanna Longhi
- Dipartimento di Medicina Molecolare e Traslazionale; Università di Brescia; Brescia Italy
- CNISM Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia; Roma Italy
| | - Ettore Castiglioni
- Dipartimento di Medicina Molecolare e Traslazionale; Università di Brescia; Brescia Italy
- JASCO Europe; Cremella LC Italy
| | - Claudio Villani
- Dipartimento di Chimica e Tecnologie del Farmaco; Università di Roma La Sapienza; Roma Italy
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15
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Abbate S, Mazzeo G, Meneghini S, Longhi G, Boiadjiev SE, Lightner DA. Bicamphor: a prototypic molecular system to investigate vibrational excitons. J Phys Chem A 2015; 119:4261-7. [PMID: 25871493 DOI: 10.1021/acs.jpca.5b02332] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Vibrational circular dichroism (VCD) and IR spectra have been recorded in the fingerprint and carbonyl stretching regions for endo,endo-bicamphor (1), exo,exo-bicamphor (2), endo,exo-bicamphor (3), 3,3'-bicamphorylidene (4), and exo,exo-bis-thiocamphor (5). The C2 symmetry possessed by these molecular systems (except in one case), as well as their limited conformational mobility associated with well-defined degrees of freedom, allow for optimal test of the vibrational circular dichroism exciton chirality (VCDEC) rule introduced by Taniguchi and Monde. Density functional theory calculations are employed not only to predict the entire aspect of the VCD and IR spectra but also to study how the VCDEC rule may be impacted by the coupling between C═O stretchings and from C═O stretchings with other vibrational modes and by the rotation about the C-C bond connecting the two camphors. Comments are provided about the limitations and potentialities of the VCDEC method and about the manifestation of different vibrational excitons in other regions of the VCD spectra, either in the mid-IR or in the CH-stretching regions.
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Affiliation(s)
- Sergio Abbate
- †Dipartimento di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy.,‡CNISM Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia,Via della Vasca Navale, 84, 00146 Roma, Italy
| | - Giuseppe Mazzeo
- †Dipartimento di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Silvia Meneghini
- †Dipartimento di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy.,§Dipartimento di Scienze del Farmaco, viale Taramelli 12, Università di Pavia, 27100 Pavia, Italy
| | - Giovanna Longhi
- †Dipartimento di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy.,‡CNISM Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia,Via della Vasca Navale, 84, 00146 Roma, Italy
| | - Stefan E Boiadjiev
- ∥Department of Chemistry and Biochemistry, Medical University-Pleven, 1 St. Kl. Ohridski Str., 5800 Pleven, Bulgaria
| | - David A Lightner
- ⊥Department of Chemistry, University of Nevada, 1664 North Virginia Street, Reno, Nevada 89557-0020, United States
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16
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Calvo F. Atomistic Modeling of IR Action Spectra Under Circularly Polarized Electromagnetic Fields: Toward Action VCD Spectra. Chirality 2015; 27:253-61. [DOI: 10.1002/chir.22421] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Revised: 11/06/2014] [Accepted: 11/28/2014] [Indexed: 11/12/2022]
Affiliation(s)
- Florent Calvo
- Laboratoire Interdisciplinaire de Physique; Université Joseph Fourier; Grenoble France
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17
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Fusè M, Mazzeo G, Longhi G, Abbate S, Zerla D, Rimoldi I, Contini A, Cesarotti E. VCD spectroscopy as an excellent probe of chiral metal complexes containing a carbon monoxide vibrational chromophore. Chem Commun (Camb) 2015; 51:9385-7. [DOI: 10.1039/c5cc02170g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
η5-Menthyl-C5H4Ru(ii) carbonyl complexes show VCD of CO; the stretching is very sensitive and diagnostic to the (R)Ru/(S)Rumetal chirality.
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Affiliation(s)
- Marco Fusè
- Dipartimento di Scienze Farmaceutiche
- Università di Milano Via Golgi 19
- 20133 Milano
- Italy
| | - Giuseppe Mazzeo
- Dipartimento di Medicina Molecolare e Traslazionale, Università di Brescia
- 25123 Brescia
- Italy
| | - Giovanna Longhi
- Dipartimento di Medicina Molecolare e Traslazionale, Università di Brescia
- 25123 Brescia
- Italy
- CNISM Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia
- 00146 Roma
| | - Sergio Abbate
- Dipartimento di Medicina Molecolare e Traslazionale, Università di Brescia
- 25123 Brescia
- Italy
- CNISM Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia
- 00146 Roma
| | - Daniele Zerla
- Dipartimento di Scienze Farmaceutiche
- Università di Milano Via Golgi 19
- 20133 Milano
- Italy
| | - Isabella Rimoldi
- Dipartimento di Scienze Farmaceutiche
- Università di Milano Via Golgi 19
- 20133 Milano
- Italy
| | - Alessandro Contini
- Dipartimento di Scienze Farmaceutiche
- Università di Milano Via Golgi 19
- 20133 Milano
- Italy
| | - Edoardo Cesarotti
- Dipartimento di Scienze Farmaceutiche
- Università di Milano Via Golgi 19
- 20133 Milano
- Italy
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18
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Mazzeo G, Longhi G, Abbate S, Buonerba F, Ruzziconi R. Chiroptical Signatures of Planar and Central Chirality in [2]Paracyclo[2](5,8)quinolinophane Derivatives. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402945] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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19
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Passarello M, Abbate S, Longhi G, Lepri S, Ruzziconi R, Nicu VP. Importance of C*–H Based Modes and Large Amplitude Motion Effects in Vibrational Circular Dichroism Spectra: The Case of the Chiral Adduct of Dimethyl Fumarate and Anthracene. J Phys Chem A 2014; 118:4339-50. [DOI: 10.1021/jp502544v] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marco Passarello
- Dipartimento
di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Sergio Abbate
- Dipartimento
di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy
- CNISM Consorzio
Nazionale Interuniversitario per le Scienze Fisiche della Materia, Via della Vasca Navale, 84, 00146 Roma, Italy
| | - Giovanna Longhi
- Dipartimento
di Medicina Molecolare e Traslazionale, Università di Brescia, Viale Europa 11, 25123 Brescia, Italy
- CNISM Consorzio
Nazionale Interuniversitario per le Scienze Fisiche della Materia, Via della Vasca Navale, 84, 00146 Roma, Italy
| | - Susan Lepri
- Dipartimento
di Chimica, Biologia e Biotecnologie, Università di Perugia, via Elce
di Sotto 8, 06100 Perugia, Italy
| | - Renzo Ruzziconi
- Dipartimento
di Chimica, Biologia e Biotecnologie, Università di Perugia, via Elce
di Sotto 8, 06100 Perugia, Italy
| | - Valentin Paul Nicu
- Theoretical
Chemistry, Vrjie Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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20
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Sherer EC, Lee CH, Shpungin J, Cuff JF, Da C, Ball R, Bach R, Crespo A, Gong X, Welch CJ. Systematic approach to conformational sampling for assigning absolute configuration using vibrational circular dichroism. J Med Chem 2014; 57:477-94. [PMID: 24383452 DOI: 10.1021/jm401600u] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Systematic methods that speed-up the assignment of absolute configuration using vibrational circular dichrosim (VCD) and simplify its usage will advance this technique into a robust platform technology. Applying VCD to pharmaceutically relevant compounds has been handled in an ad hoc fashion, relying on fragment analysis and technical shortcuts to reduce the computational time required. We leverage a large computational infrastructure to provide adequate conformational exploration which enables an accurate assignment of absolute configuration. We describe a systematic approach for rapid calculation of VCD/IR spectra and comparison with corresponding measured spectra and apply this approach to assign the correct stereochemistry of nine test cases. We suggest moving away from the fragment approach when making VCD assignments. In addition to enabling faster and more reliable VCD assignments of absolute configuration, the ability to rapidly explore conformational space and sample conformations of complex molecules will have applicability in other areas of drug discovery.
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Affiliation(s)
- Edward C Sherer
- Merck Research Laboratories, Merck & Co., Inc., PO Box 2000, Rahway, New Jersey 07065, United States
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21
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Liu L, Guo J, Li Z, Wei J. Photobase generating monomers: synthesis, evaluation and utilization for fabricating fluorescence patterns. RSC Adv 2014. [DOI: 10.1039/c4ra00499j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
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22
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Scafato P, Caprioli F, Pisani L, Padula D, Santoro F, Mazzeo G, Abbate S, Lebon F, Longhi G. Combined use of three forms of chiroptical spectroscopies in the study of the absolute configuration and conformational properties of 3-phenylcyclopentanone, 3-phenylcyclohexanone, and 3-phenylcycloheptanone. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.10.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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23
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Experimental and Calculated CPL Spectra and Related Spectroscopic Data of Camphor and Other Simple Chiral Bicyclic Ketones. Chirality 2013; 25:589-99. [DOI: 10.1002/chir.22176] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Accepted: 02/26/2013] [Indexed: 11/07/2022]
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24
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Wu T, Zhang XP, Li CH, Bouř P, Li YZ, You XZ. Vibrational and electronic circular dichroism monitoring of copper(II) coordination with a chiral ligand. Chirality 2012; 24:451-8. [DOI: 10.1002/chir.22010] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tao Wu
- State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering; Nanjing University; Nanjing; China
| | - Xiao-Peng Zhang
- State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering; Nanjing University; Nanjing; China
| | - Cheng-Hui Li
- State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering; Nanjing University; Nanjing; China
| | - Petr Bouř
- Institute of Organic Chemistry and Biochemistry; Praha 6; Czech Republic
| | - Yi-Zhi Li
- State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering; Nanjing University; Nanjing; China
| | - Xiao-Zeng You
- State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering; Nanjing University; Nanjing; China
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25
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Ostrowski S, Jamróz MH, Rode JE, Dobrowolski JC. On stability, chirality measures, and theoretical VCD spectra of the chiral C58X2 fullerenes (X = N, B). J Phys Chem A 2012; 116:631-43. [PMID: 22077444 DOI: 10.1021/jp208687c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The stability of all 23 C(58)N(2) and C(58)B(2) heterofullerenes in the singlet and triplet states was determined at the B3LYP/6-31G** level. In equilibrium mixture the achiral (1,4) C(58)N(2) isomer would be populated in ca. 95.8%, the chiral (1,16) one in ca. 3.3%, and the achiral (1,4) C(58)B(2) in 100%, whereas all triplet state isomers are less stable. Fourteen out of 23 C(58)X(2) are chiral. Four different chirality measures were calculated by our own CHIMEA program: pure geometrical, labeled, mass, and charge. Intercorrelations between the measures for all chiral compounds indicate that the pure geometrical chirality measure is unstable and should not be used in QSAR predictions of the other molecular properties, while the labeled and mass-weighted ones are promising QSAR descriptors. For each chiral C(58)N(2) molecule, some very strong VCD bands, of intensity comparable with that in the IR spectra, can serve in identification and characterization of the isomers.
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Affiliation(s)
- Sławomir Ostrowski
- Industrial Chemistry Research Institute, 8 Rydygiera Street, 01-793 Warsaw, Poland
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26
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Baggetto L, Danilov D, Notten PHL. Honeycomb-structured silicon: remarkable morphological changes induced by electrochemical (de)lithiation. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:1563-1566. [PMID: 21449062 DOI: 10.1002/adma.201003665] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2010] [Indexed: 05/30/2023]
Affiliation(s)
- Loïc Baggetto
- Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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27
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Chiral terpenes in different phases: R-(−)-camphorquinone studied by IR–Raman–VCD spectroscopies and theoretical calculations. Struct Chem 2010. [DOI: 10.1007/s11224-010-9690-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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28
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Partal Ureña F, Avilés Moreno JR, López González JJ. Rotational strength sign and normal modes description: A theoretical and experimental comparative study in bicyclic terpenes. Chirality 2010; 22 Suppl 1:E123-9. [DOI: 10.1002/chir.20899] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2009] [Accepted: 06/16/2010] [Indexed: 11/09/2022]
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29
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Longhi G, Abbate S, Scafato P, Rosini C. A vibrational circular dichroism approach to the determination of the absolute configuration of flexible and transparent molecules: fluorenone ketals of 1,n-diols. Phys Chem Chem Phys 2010; 12:4725-32. [DOI: 10.1039/b913213a] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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