1
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Tauchi D, Kanno K, Hasegawa M, Mazaki Y, Tsubaki K, Sugiura KI, Shiga T, Mori S, Nishikawa H. Aggregation-induced enhanced fluorescence emission of chiral Zn(II) complexes coordinated by Schiff-base type binaphthyl ligands. Dalton Trans 2024; 53:8926-8933. [PMID: 38687172 DOI: 10.1039/d4dt00903g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
A pair of novel chiral Zn(II) complexes coordinated by Schiff-base type ligands derived from BINOL (1,1'-bi-2-naphthol), R-/S-Zn, were synthesized. X-ray crystallography revealed the presence of two crystallographically independent complexes; one has a distorted trigonal-bipyramidal structure coordinated by two binaphthyl ligands and one disordered methanol molecule (molecule A), while the other has a distorted tetrahedral structure coordinated by two binaphthyl ligands (molecule B). Numerous CH⋯π and CH⋯O interactions were identified, contributing to the formation of a 3-dimensional rigid network structure. Both R-/S-Zn exhibited fluorescence in both CH2Cl2 solutions and powder samples, with the photoluminescence quantum yields (PLQYs) of powder samples being twice as large as those in solutions, indicating aggregation-induced enhanced emission (AIEE). The AIEE properties were attributed to the restraint of the molecular motion arising from the 3-dimensional intermolecular interactions. CD and CPL spectra were observed for R-/S-Zn in both solutions and powders. The dissymmetry factors, gabs and gCPL values, were within the order of 10-3 to 10-4 magnitudes, comparable to those reported for chiral Zn(II) complexes in previous studies.
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Affiliation(s)
- Daiki Tauchi
- Graduate School of Science and Engineering, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan.
| | - Katsuya Kanno
- Graduate School of Science and Engineering, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan.
| | - Masashi Hasegawa
- Graduate School of Science, Kitasato University, Kanagawa 252-0373, Japan
| | - Yasuhiro Mazaki
- Graduate School of Science, Kitasato University, Kanagawa 252-0373, Japan
| | - Kazunori Tsubaki
- Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Kyoto 606-8522, Japan
| | - Ken-Ichi Sugiura
- Graduate School of Science, Tokyo Metropolitan University, Tokyo, 192-0397, Japan
| | - Takuya Shiga
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8577, Japan
| | - Seiji Mori
- Graduate School of Science and Engineering, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan.
| | - Hiroyuki Nishikawa
- Graduate School of Science and Engineering, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan.
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2
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Bhattacharjee T, Adhikari S, Sheikh AH, Mahmoudi G, Mlowe S, Akerman MP, Choudhury NA, Chakraborty S, Butcher RJ, Kennedy AR, Demir BS, Örs A, Saygideger Y. Syntheses, crystal structures, theoretical studies, and anticancer properties of an unsymmetrical schiff base ligand N-2-(6-methylpyridyl)-2-hydroxy-1-naphthaldimine and its Ni(II) complex. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133717] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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3
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Enamullah M, Mostafizur Rahman M, Khairul Islam M, Woschko D, Janiak C, Pescitelli G. Characterization of Diastereomeric Equilibria of Pseudotetrahedral Bis[(R or S)-N-1-(Ar)Ethylsalicylaldiminato-κ 2 N,O]zinc(II) with Λ/Δ-Chirality-At-Metal Induction. ChemistryOpen 2022; 11:e202200116. [PMID: 35822916 PMCID: PMC9278105 DOI: 10.1002/open.202200116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 05/24/2022] [Indexed: 11/10/2022] Open
Abstract
A family of bis[(R or S)-N-1-(Ar)ethylsalicylaldiminato-κ2 N,O]-Δ/Λ-zinc(II) {Ar=C6 H5 (ZnRL1 or ZnSL1 ), p-CH3 OC6 H4 (ZnRL2 or ZnSL2 ) and p-ClC6 H4 (ZnRL3 or ZnSL3 )} compounds was synthesized and investigated by multiple methods. They feature Λ/Δ-chirality-at-metal induction along the pseudo-C2 axis of the molecules. The chirality induction is quantitative in the solid state, explored by X-ray crystallography and powder X-ray diffraction (PXRD), where R or S-ligated complexes diastereoselectively yield Λ or Δ-configuration at the metal. On the other hand, Λ and Δ-diastereomers co-exist in solution. The Λ⇆Δ equilibrium is solvent- and temperature-dependent. Electronic circular dichroism (ECD) spectra confirm the existence of a diastereomeric excess of Λ-ZnRL1-3 or Δ-ZnSL1-3 in solution. DSC analysis reveals thermally induced irreversible phase transformation from a crystalline solid to an isotropic liquid phase. ECD spectra were reproduced by DFT geometry optimizations and time-dependent DFT (TD-DFT) calculations, providing ultimate proof of the dominant chirality atmetal in solution.
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Affiliation(s)
| | | | | | - Dennis Woschko
- Institute of Inorganic Chemistry and Structural ChemistryHeinrich-Heine-University of Düsseldorf40204DüsseldorfGermany
| | - Christoph Janiak
- Institute of Inorganic Chemistry and Structural ChemistryHeinrich-Heine-University of Düsseldorf40204DüsseldorfGermany
| | - Gennaro Pescitelli
- Department of Chemistry and Industrial ChemistryUniversity of Pisa56124PisaItaly
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4
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Ikeshita M, Mizugaki M, Ishikawa T, Matsudaira K, Kitahara M, Imai Y, Tsuno T. Sign control of circularly polarized luminescence of chiral Schiff-base Zn(II) complexes through coordination geometry changes. Chem Commun (Camb) 2022; 58:7503-7506. [PMID: 35698874 DOI: 10.1039/d2cc01959k] [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
The handedness of circularly polarized luminescence (CPL) of Zn(II) complexes with a chiral Schiff-base ligand can be controlled by coordination geometry changes in solution and in the solid state. The relationships between molecular structure and chiroptical properties were discussed with the results of X-ray diffraction analysis and DFT calculations.
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Affiliation(s)
- Masahiro Ikeshita
- Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University, Narashino, Chiba 275-8575, Japan.
| | - Momo Mizugaki
- Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University, Narashino, Chiba 275-8575, Japan.
| | - Takahiro Ishikawa
- Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University, Narashino, Chiba 275-8575, Japan.
| | - Kana Matsudaira
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
| | - Maho Kitahara
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
| | - Yoshitane Imai
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
| | - Takashi Tsuno
- Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University, Narashino, Chiba 275-8575, Japan.
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Rudbari HA, Kordestani N, Cuevas-Vicario JV, Zhou M, Efferth T, Correia I, Schirmeister T, Barthels F, Enamullah M, Fernandes AR, Micale N. Investigation of the influence of chirality and halogen atoms on the anticancer activity of enantiopure palladium( ii) complexes derived from chiral amino-alcohol Schiff bases and 2-picolylamine. NEW J CHEM 2022. [DOI: 10.1039/d2nj00321j] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
In order to evaluate the impact of chirality and halogen-substitution pattern on biological activity, four mixed-ligand enantiomeric pairs of Pd(ii) complexes were synthesized and characterized.
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Affiliation(s)
- Hadi Amiri Rudbari
- Department of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
| | - Nazanin Kordestani
- Department of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
| | - Jose V. Cuevas-Vicario
- Department of Chemistry, Universidad de Burgos, Pza. Misael Bañuelos s/n, E-09001 Burgos, Spain
| | - Min Zhou
- Department of Pharmaceutical Biology, Institute of Pharmaceutical and Biomedical Sciences, Johannes Gutenberg University, Staudinger Weg 5, 55128 Mainz, Germany
| | - Thomas Efferth
- Department of Pharmaceutical Biology, Institute of Pharmaceutical and Biomedical Sciences, Johannes Gutenberg University, Staudinger Weg 5, 55128 Mainz, Germany
| | - Isabel Correia
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
| | - Tanja Schirmeister
- Department of Medicinal Chemistry, Institute of Pharmaceutical and Biomedical Sciences, Johannes Gutenberg University, Staudinger Weg 5, 55128 Mainz, Germany
| | - Fabian Barthels
- Department of Medicinal Chemistry, Institute of Pharmaceutical and Biomedical Sciences, Johannes Gutenberg University, Staudinger Weg 5, 55128 Mainz, Germany
| | - Mohammed Enamullah
- Department of Chemistry, Jahangirnagar University, Dhaka 1342, Bangladesh
| | - Alexandra R. Fernandes
- Associate Laboratory i4HB - Institute for Health and Bioeconomy, NOVA School of Science and Technology, NOVA University Lisbon, 2819-516 Caparica, Portugal
- UCIBIO – Applied Molecular Biosciences Unit, Department of Life Sciences, NOVA School of Science and Technology, NOVA University Lisbon, 2819-516 Caparica, Portugal
| | - Nicola Micale
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Viale Ferdinando Stagno D’Alcontres 31, I-98166 Messina, Italy
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6
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Amiri Rudbari H, Saadati A, Ariaeefar M, Blacque O, Correia I, Islam MK, Woschko D, Janiak C, Enamullah M. Pseudotetrahedral Zn(II)-(R or S)-dihalogen-salicylaldiminato complexes with Λ- or Δ-chirality induction at-metal. Dalton Trans 2022; 51:2385-2399. [DOI: 10.1039/d1dt04220c] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reactions of enantiopure (S or R)-N-1-(phenyl)ethyl-2,4-X1,X2-salicylaldimine (S-H or R-H; X1, X2 = dihalogen) with Zn(II)-nitrate give bis[(S or R)-N-1-(phenyl)ethyl-2,4-X1,X2-salicylaldiminato-κ2N,O]-zinc(II), (Δ-ZnS or Λ-ZnR) with Δ/Λ-chirality induction at-metal in the C2-symmetric molecules....
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7
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Ben Abdallah J, Gόmez-Garcίa CJ, Boughzala H. Synthesis, crystal structure, optical, thermal and magnetic studies of a new organic-inorganic hybrid based on tetrachloroferrate (III). J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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8
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Górecki M, Enamullah M, Islam MA, Islam MK, Höfert SP, Woschko D, Janiak C, Pescitelli G. Synthesis and Characterization of Bis[( R or S)- N-1-(X-C 6H 4)ethyl-2-oxo-1-naphthaldiminato-κ 2N, O]-Λ/Δ-cobalt(II) (X = H, p-CH 3O, p-Br) with Symmetry- and Distance-Dependent Vibrational Circular Dichroism Enhancement and Sign Inversion. Inorg Chem 2021; 60:14116-14131. [PMID: 34477372 PMCID: PMC8456410 DOI: 10.1021/acs.inorgchem.1c01503] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
The enantiopure Schiff
bases (R or S)-N-1-(X-C6H4)ethyl-2-hydroxy-1-naphthaldimine
{X = H [(R or S)-HL1], p-CH3O [(R or S)-HL2],
and p-Br [(R- or S)-HL3]} react with cobalt(II) acetate to give bis[(R or S)-N-1-(X-C6H4)ethyl-2-oxo-1-naphthaldiminato-κ2N,O]-Λ/Δ-cobalt(II) {X = H
[Λ/Δ-Co-(R or S)-L1], p-CH3O [Λ/Δ-Co-(R or S)-L2], and p-Br [Λ/Δ-Co-(R or S)-L3]} (1–3), respectively. Induced Λ and Δ chirality originates
at the metal center of the C2-symmetric
molecule in pseudotetrahedral geometry. Differential scanning calorimetry
analyses explored the thermal stability of the complexes, which undergo
reversible phase transformation from crystalline solid to isotropic
liquid phase for 1 and 3 but irreversible
phase transformation for 2. Like other cobalt(II) complexes,
compounds 1–3 exhibit a continuous
ensemble of absorption and circular dichroism bands, which span from
the UV to IR region and can be collected into a superspectrum. Infrared
vibrational circular dichroism (IR-VCD) spectra witness the coupling
between Co2+-centered low-lying electronic states and ligand-centered
vibrations. The coupling produces enhanced and almost monosignate
VCD spectra, with both effects being mode-dependent in terms of the A or B symmetry (in the C2 point group) and distance from the Co2+ core. Chiroptical superspectra of naphthaldiminatocobalt(II)
complexes 1−3 exhibit a continuous
ensemble of absorption
and circular dichroism bands from the UV to IR region, including peculiar
and almost monosignate vibrational circular dichroism (VCD) spectra
dominated by the coupling between Co2+-centered low-lying
electronic states and ligand-centered vibrations, which depend on
the normal-mode symmetry and distance from the Co2+ core
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Affiliation(s)
- Marcin Górecki
- Department of Chemistry and Industrial Chemistry, University of Pisa, Pisa 56126, Italy.,Institute of Organic Chemistry, Polish Academy of Sciences, Warsaw 01-224, Poland
| | - Mohammed Enamullah
- Department of Chemistry, Jahangirnagar University, Dhaka 1342, Bangladesh
| | | | | | - Simon-Patrick Höfert
- Institute of Inorganic Chemistry and Structural Chemistry, Heinrich-Heine-University of Düsseldorf, Düsseldorf 40225, Germany
| | - Dennis Woschko
- Institute of Inorganic Chemistry and Structural Chemistry, Heinrich-Heine-University of Düsseldorf, Düsseldorf 40225, Germany
| | - Christoph Janiak
- Institute of Inorganic Chemistry and Structural Chemistry, Heinrich-Heine-University of Düsseldorf, Düsseldorf 40225, Germany
| | - Gennaro Pescitelli
- Department of Chemistry and Industrial Chemistry, University of Pisa, Pisa 56126, Italy
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9
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Enamullah M, Al-moktadir Zaman M, Bindu MM, Woschko D, Islam MK, Janiak C. Pseudotetrahedral high-spin manganese(II)-complexes with (S or R)-N-1-(Ar)ethyl-salicylaldimine: Chiroptical property, chirality induction at-metal, paramagnetism, redox-potential, PXRD structures and DFT/TDDFT. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Kordestani N, Amiri Rudbari H, Correia I, Valente A, Côrte-Real L, Islam MK, Micale N, Braun JD, Herbert DE, Tumanov N, Wouters J, Enamullah M. Heteroleptic enantiopure Pd( ii)-complexes derived from halogen-substituted Schiff bases and 2-picolylamine: synthesis, experimental and computational characterization and investigation of the influence of chirality and halogen atoms on the anticancer activity. NEW J CHEM 2021. [DOI: 10.1039/d1nj01491a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
To investigate the effect of chirality and different halogen substituents on the anticancer activity, seven enantiomeric pairs of palladium complexes were synthesized and characterized.
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Affiliation(s)
| | | | - Isabel Correia
- Centro de Química Estrutural
- Departamento de Engenharia Química
- Instituto Superior Técnico
- 1049-001 Lisboa
- Portugal
| | - Andreia Valente
- Centro de Química Estrutural and Departamento de Química e Bioquímica
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
- Portugal
| | - Leonor Côrte-Real
- Centro de Química Estrutural and Departamento de Química e Bioquímica
- Faculdade de Ciências
- Universidade de Lisboa
- 1749-016 Lisboa
- Portugal
| | | | - Nicola Micale
- Department of Chemical, Biological
- Pharmaceutical and Environmental Sciences
- University of Messina
- I-98166 Messina
- Italy
| | - Jason D. Braun
- Department of Chemistry
- University of Manitoba
- Winnipeg
- Canada
| | | | - Nikolay Tumanov
- Department of Chemistry
- Namur Institute of Structured Matter
- University of Namur
- 5000 Namur
- Belgium
| | - Johan Wouters
- Department of Chemistry
- Namur Institute of Structured Matter
- University of Namur
- 5000 Namur
- Belgium
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11
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Zullo V, Górecki M, Guazzelli L, Mezzetta A, Pescitelli G, Iuliano A. Exploiting isohexide scaffolds for the preparation of chiral ionic liquids tweezers. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114528] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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12
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Aryaeifar M, Amiri Rudbari H, Blacque O, Islam MK, Scopelliti R, Braun JD, Herbert DE, Bruno G, Janiak C, Enamullah M. Schiff base ligands derived from 1,2-bis(2′-nitro-/amino-phenoxy)-3-R-benzene and 2-hydroxy-1-naphthaldehyde and their Cu/Zn( ii) complexes: synthesis, characterization, X-ray structures and computational studies. CrystEngComm 2021. [DOI: 10.1039/d1ce00829c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Racemic crystals of Cu/Zn(ii)-tetradentate Schiff base ligands with Λ/Δ-chirality induction at-metal center.
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Affiliation(s)
- Mahnaz Aryaeifar
- Department of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
| | - Hadi Amiri Rudbari
- Department of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
| | - Olivier Blacque
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | | | - Rosario Scopelliti
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Jason D. Braun
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - David E. Herbert
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Giuseppe Bruno
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Viale Ferdinando Stagno D'Alcontres 31, I-98166 Messina, Italy
| | - Christoph Janiak
- Institut für Anorganische Chemie und Strukturchemie, Heinrich-Heine-Universität Düsseldorf, D-40204 Düsseldorf, Germany
| | - Mohammed Enamullah
- Department of Chemistry, Jahangirnagar University, Dhaka 1342, Bangladesh
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13
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Enamullah M, Anwar Hossain M, Islam MK, Woschko D, Janiak C. Pseudotetrahedral copper(II)-complexes with enantiopure ( R or S)-2-(((aryl)ethylimino)ethyl)phenolate Schiff base ligands. Dalton Trans 2021; 50:9236-9249. [PMID: 34128030 DOI: 10.1039/d1dt01671g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Condensation of 2-hydroxy-benzophenone (HL') with (R or S)-(Ar)ethylamine yields the enantiopure Schiff bases (S or R)-2-((E)-1-(1-(Ar)ethylimino)ethyl)phenol {Ar = C6H5 (S- or R-HL1), p-CH3OC6H4 (S- or R-HL2)}. These Schiff bases react with copper(ii) acetate under reflux to give green microcrystals of bis[(R or S)-2-((E)-1-(1-(Ar)ethylimino)ethyl)phenolato-κ2N,O]-Λ/Δ-copper(ii), {Ar = C6H5 (Λ/Δ-Cu-R- or S-L1), p-CH3OC6H4 (Λ/Δ-Cu-R- or S-L2)} with induction of Λ/Δ-chirality at-metal. The presence of Schiff base ligands in the paramagnetic green microcrystals is confirmed by decomplexation reaction with NaCN via reduction of Cu(ii) to Cu(i) in DMSO-d6 solution. Crystallization attempts of the green microcrystalline Schiff-base Cu complexes provide deep-green block-shaped crystals of an about equal admixture of bis[2-oxo-benzophenonato-κ2O,O']-copper(ii), (CuL'2) and bis[2-(imino(phenyl)methyl)phenolato-κ2N,O]copper(ii), (CuL''2) via in situ hydrolysis of the coordinated Schiff base ligands back to 2-hydroxy-benzophenone (HL') and to 2-(imino(phenyl)methyl)phenol (HL''), which in-turn bind with the copper(ii) ion. Powder X-ray diffraction (PXRD) patterns of R-HL1 and Cu-R-L1 allowed their structure determinations using the program Expo-2014 followed by Rietveld refinement. The Cu structures refined to four-coordinated Λ/Δ-copper(ii)-complexes by the two phenolate-oxygen and two imine-nitrogen atoms from two Schiff base ligands in a pseudotetrahedral geometry. DFT optimized structures (at gas-phase) reveal the Δ-Cu-S-L1 or Λ-Cu-R-L1 diastereomer as slightly more stable than the corresponding Λ-Cu-S-L1 or Δ-Cu-R-L1 by ca. 7.60 kcal mol-1, resulting from diastereoselectively induced Λ vs. Δ-chirality at-metal. Electronic circular dichroism (ECD) spectra display mirror-image relationships and comparisons of experimental and simulated ECD spectra by TDDFT suggest an excess of the Δ-Cu-S-L1 or Λ-Cu-R-L1 diastereomer in solution. The cyclic voltammograms demonstrate two one electron charge transfer processes for Cu2+/Cu+ and Cu+/Cu0 couples in acetonitrile, respectively.
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Affiliation(s)
- Mohammed Enamullah
- Department of Chemistry, Jahangirnagar University, Dhaka-1342, Bangladesh.
| | | | | | - Dennis Woschko
- Institut für Anorganische Chemie und Strukturchemie, Heinrich-Heine-Universität, Universitätsstr. 1, D-40225 Düsseldorf, Germany.
| | - Christoph Janiak
- Institut für Anorganische Chemie und Strukturchemie, Heinrich-Heine-Universität, Universitätsstr. 1, D-40225 Düsseldorf, Germany.
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14
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Asymmetric construction of tetrahedral chiral zinc with high configurational stability and catalytic activity. Nat Commun 2020; 11:6263. [PMID: 33298960 PMCID: PMC7726038 DOI: 10.1038/s41467-020-20074-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 11/12/2020] [Indexed: 12/13/2022] Open
Abstract
Chiral metal complexes show promise as asymmetric catalysts and optical materials. Chiral-at-metal complexes composed of achiral ligands have expanded the versatility and applicability of chiral metal complexes, especially for octahedral and half-sandwich complexes. However, Werner-type tetrahedral complexes with a stereogenic metal centre are rarely used as chiral-at-metal complexes because they are too labile to ensure the absolute configuration of the metal centre. Here we report the asymmetric construction of a tetrahedral chiral-at-zinc complex with high configurational stability, using an unsymmetric tridentate ligand. Coordination/substitution of a chiral auxiliary ligand on zinc followed by crystallisation yields an enantiopure chiral-only-at-zinc complex (> 99% ee). The enantiomer excess remains very high at 99% ee even after heating at 70 °C in benzene for one week. With this configurationally stable zinc complex of the tridentate ligand, the remaining one labile site on the zinc can be used for a highly selective asymmetric oxa-Diels-Alder reaction (98% yield, 87% ee) without substantial racemisation.
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15
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Cho J, Jeong JH, Shin HJ, Min KS. Synthesis, structure and photoluminescence properties of naphthalene-based chiral zinc(II) complexes. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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16
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Swathi K, Sissa C, Painelli A, George Thomas K. Supramolecular chirality: a caveat in assigning the handedness of chiral aggregates. Chem Commun (Camb) 2020; 56:8281-8284. [PMID: 32572405 DOI: 10.1039/d0cc01922d] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The handedness of a supramolecular chiral aggregate is often assigned based on the sign of circular dichroism spectra, adopting the exciton chirality method. However, the method does not properly account for the nature of intermolecular interactions. We introduce a generalized picture on the use of the sign of chiral signals in determining the helicity of chiral aggregates, rooted in the exciton model, supported by TD-DFT results.
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Affiliation(s)
- K Swathi
- Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Università di Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy.
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17
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Enamullah M, Hossain MA, Bindu MM, Islam MK, Zaman MAM. Diastereoselection and induced chirality at-metal in distorted-tetrahedral bis[( R or S)-1-( p-R 1-C 6H 4)- N-(phenyl(pyridin-2-yl)methylene)ethanamino-κ 2N, N]-Δ/Λ-copper(PF 6) 2. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1795841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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18
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Chen C, Ji J, Wang CJ, Jia AQ, Zhang QF. Synthesis, characterization and crystal structures of half-sandwich ruthenium complexes with bidentate chiral Schiff-base ligands. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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19
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Enamullah M, Islam MK, Höfert SP, Janiak C. Syntheses, spectroscopy, tautomerism, induced chirality and molecular structure of 3-(o/p-tolylimino)indolin-2-one and bis[3-(o/p-tolylimino)indole-2-olato-κ2N,O]-Δ/Λ-zinc(II). Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2019.119245] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Enamullah M, Al-moktadir Zaman M, Bindu MM, Islam MK, Islam MA. Experimental and theoretical studies on isatin-Schiff bases and their copper(II)-complexes: Syntheses, spectroscopy, tautomerism, redox potentials, EPR, PXRD and DFT/TDDFT. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.127207] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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21
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Kordestani N, Amiri Rudbari H, Bruno G, Rosario S, Braun JD, Herbert DE, Blacque O, Correia I, Zaman MAM, Bindu MM, Janiak C, Enamullah M. Solid-state to solution helicity inversion of pseudotetrahedral chiral copper(ii) complexes with 2,4-dihalo-salicylaldiminate ligands. Dalton Trans 2020; 49:8247-8264. [DOI: 10.1039/d0dt01649g] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Steric constraints by the halogen substituents show an efficient control of stereochemical behaviours of the complexes.
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Affiliation(s)
| | | | - Giuseppe Bruno
- Department of Chemical
- Biological
- Pharmaceutical and Environmental Sciences
- University of Messina
- I-98166 Messina
| | - Scopelliti Rosario
- Institut des Sciences et Ingénierie Chimiques
- École Polytechnique Fédérale de Lausanne (EPFL)
- CH-1015 Lausanne
- Switzerland
| | - Jason D. Braun
- Department of Chemistry
- University of Manitoba
- Winnipeg
- Canada
| | | | - Olivier Blacque
- Department of Chemistry
- University of Zurich
- Zurich
- Switzerland
| | - Isabel Correia
- Centro de Química Estrutural
- Departamento de Engenharia Química
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisboa
| | | | | | - Christoph Janiak
- Institut für Anorganische Chemie und Strukturchemie
- Universität Düsseldorf
- D-40204 Düsseldorf
- Germany
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22
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Farahmand S, Ghiaci M, Vatanparast M, Razavizadeh JS. One-step hydroxylation of benzene to phenol over Schiff base complexes incorporated onto mesoporous organosilica in the presence of different axial ligands. NEW J CHEM 2020. [DOI: 10.1039/d0nj00928h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Liquid-phase hydroxylation of benzene to phenol using Schiff base complexes anchored on a mesoporous organosilica support was investigated in various solvents when molecular oxygen was utilized as a green oxidant.
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Affiliation(s)
| | - Mehran Ghiaci
- Department of Chemistry
- Isfahan University of Technology
- Isfahan
- Iran
| | - Morteza Vatanparast
- Department of Chemistry
- Amirkabir University of Technology
- Tehran Polytechnic
- Tehran
- Iran
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23
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High-spin bis[(S or R)-N-1-(Ar)ethyl-salicylaldiminato-κ2N,O]-Λ/Δ-iron(II): Combined studies of syntheses, spectroscopy, diastereoselection, electrochemistry, paramagnetic, thermal, PXRD and DFT/TDDFT. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.126947] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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24
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Spielvogel KD, Coughlin EJ, Petras H, Luna JA, Benson A, Donahue CM, Kibasa A, Lee K, Salacinski R, Bart SC, Shaw SK, Shepherd JJ, Daly SR. The Influence of Redox-Innocent Donor Groups in Tetradentate Ligands Derived from o-Phenylenediamine: Electronic Structure Investigations with Nickel. Inorg Chem 2019; 58:12756-12774. [DOI: 10.1021/acs.inorgchem.9b01675] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Kyle D. Spielvogel
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242-1294, United States
| | - Ezra J. Coughlin
- H.C. Brown Laboratory, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Hayley Petras
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242-1294, United States
| | - Javier A. Luna
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242-1294, United States
| | - Austin Benson
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242-1294, United States
| | - Courtney M. Donahue
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242-1294, United States
| | - Amani Kibasa
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242-1294, United States
| | - Kyounghoon Lee
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242-1294, United States
| | - Ryan Salacinski
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242-1294, United States
| | - Suzanne C. Bart
- H.C. Brown Laboratory, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Scott K. Shaw
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242-1294, United States
| | - James J. Shepherd
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242-1294, United States
| | - Scott R. Daly
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242-1294, United States
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25
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Sheta SM, El-Sheikh SM, Abd-Elzaher MM, Wassel AR. A novel nano-size lanthanum metal-organic framework based on 5-amino-isophthalic acid and phenylenediamine: Photoluminescence study and sensing applications. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.4777] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Sheta M. Sheta
- Inorganic Chemistry Department; National Research Centre; 33 El-Behouth St., Dokki Giza 12622 Egypt
| | - Said M. El-Sheikh
- Nanomaterials and Nanotechnology Department; Central Metallurgical R & D Institute; Cairo 11421 Egypt
| | - Mohkles M. Abd-Elzaher
- Inorganic Chemistry Department; National Research Centre; 33 El-Behouth St., Dokki Giza 12622 Egypt
| | - Ahmed R. Wassel
- Electron Microscope & Thin films Department, Physics Division; National Research Centre; 33 El-Behouth St., Dokki Giza 12622 Egypt
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26
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Goszczycki P, Stadnicka KM, Musielak B, Ostrowska K. Cobalt(II), copper(II), and zinc(II) isostructural, pseudotetrahedral, racemic complexes of pyrrolo[2,3-b]quinoxaline with bis(2-thienylmethyl)propylenediamine chain: Synthesis, crystal structure, spectroscopy. Polyhedron 2019. [DOI: 10.1016/j.poly.2018.12.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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27
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Rodríguez MR, Del Plá J, Balsa LM, León IE, Piro OE, Echeverría GA, García-Tojal J, Pis-Diez R, Parajón-Costa BS, González-Baró AC. Cu(ii) and Zn(ii) complexes with a poly-functional ligand derived from o-vanillin and thiophene. Crystal structure, physicochemical properties, theoretical studies and cytotoxicity assays against human breast cancer cells. NEW J CHEM 2019. [DOI: 10.1039/c8nj06274a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New ML2 complexes were extensively characterized showing stability in solution and promising anti-tumoral results, particularly for CuL2.
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Affiliation(s)
| | - Julián Del Plá
- CEQUINOR (CONICET-CCT La Plata, UNLP)
- B1900AVV La Plata
- Argentina
| | - Lucía M. Balsa
- CEQUINOR (CONICET-CCT La Plata, UNLP)
- B1900AVV La Plata
- Argentina
| | - Ignacio E. León
- CEQUINOR (CONICET-CCT La Plata, UNLP)
- B1900AVV La Plata
- Argentina
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28
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Enamullah M, Joy BA, Islam MK. Syntheses, spectroscopy, electrochemistry, EPR, PXRD-structure and DFT/TD-DFT of bis[2-oxo-1-naphthaldehydato-κO,O']copper(II). J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.07.068] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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29
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Pescitelli G, Lüdeke S, Chamayou AC, Marolt M, Justus V, Górecki M, Arrico L, Di Bari L, Islam MA, Gruber I, Enamullah M, Janiak C. Broad-Range Spectral Analysis for Chiral Metal Coordination Compounds: (Chiro)optical Superspectrum of Cobalt(II) Complexes. Inorg Chem 2018; 57:13397-13408. [PMID: 30339376 DOI: 10.1021/acs.inorgchem.8b01932] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Chiroptical broad-range spectral analysis extending from UV to mid-IR was employed to study a family of Co(II) N-(1-(aryl)ethyl)salicylaldiminato Schiff base complexes with pseudotetrahedral geometry associated with chirality-at-metal of the Δ/Λ type. While common chiral organic compounds have well-separated absorption and circular dichroism spectra (CD) in the UV/vis and IR regions, chiral Co(II) complexes feature an almost unique continuum of absorption and CD bands, which cover in sequence the UV, visible, near-IR (NIR), and IR regions of the electromagnetic spectrum. They can be collected in a single (chiro)optical superspectrum ranging from the UV (230 nm, 5.4 eV) to the mid-IR (1000 cm-1, 0.12 eV), which offers a fingerprint of the structure and stereochemistry of the metal complexes. Each region of the superspectrum contributes to one piece of information: the NIR-CD region, in combination with TDDFT calculations, allows a reliable assignment of the metal-centered chirality; the UV-CD region facilitates the analysis of the Δ/Λ diastereomeric equilibrium in solution; and the IR-VCD region contains a combination of low-lying metal-centered electronic states (LLES) and ligand-centered vibrations and displays characteristically enhanced and monosignate VCD bands. Circular dichroism in the NIR and IR regions is crucial to reveal the presence of d-d transitions of the Co(II) core which, due to the electric-dipole forbidden character, would be otherwise overlooked in the corresponding absorption spectra.
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Affiliation(s)
- Gennaro Pescitelli
- Department of Chemistry and Industrial Chemistry , University of Pisa , 56126 Pisa , Italy
| | - Steffen Lüdeke
- Institute of Pharmaceutical Sciences , University of Freiburg , D-79104 Freiburg , Germany
| | | | - Marija Marolt
- Institute of Pharmaceutical Sciences , University of Freiburg , D-79104 Freiburg , Germany
| | - Viktor Justus
- Institute of Pharmaceutical Sciences , University of Freiburg , D-79104 Freiburg , Germany
| | - Marcin Górecki
- Department of Chemistry and Industrial Chemistry , University of Pisa , 56126 Pisa , Italy.,Institute of Organic Chemistry , Polish Academy of Sciences , 01-224 Warsaw , Poland
| | - Lorenzo Arrico
- Department of Chemistry and Industrial Chemistry , University of Pisa , 56126 Pisa , Italy
| | - Lorenzo Di Bari
- Department of Chemistry and Industrial Chemistry , University of Pisa , 56126 Pisa , Italy
| | | | - Irina Gruber
- Institute of Inorganic Chemistry and Structural Chemistry , University of Düsseldorf , D-40225 Düsseldorf , Germany
| | - Mohammed Enamullah
- Department of Chemistry , Jahangirnagar University , Dhaka - 1342 , Bangladesh
| | - Christoph Janiak
- Institute of Inorganic Chemistry and Structural Chemistry , University of Düsseldorf , D-40225 Düsseldorf , Germany
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30
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Enamullah M, Ariful Islam M, Christin Kautz A, Janiak C. Synthesis, spectroscopy, electrochemistry, and molecular structure oftetrakis{(E)-2-((pyridin-2-ylimino)methyl)phenolato}(hydroxido)0.5(nitrato)1.5-tetracopper(II) nitrate hydroxide. J COORD CHEM 2018. [DOI: 10.1080/00958972.2018.1506111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
| | | | - Anna Christin Kautz
- Institute for Inorganic and Structure Chemistry, Heinrich-Heine-University, Düsseldorf, Germany
| | - Christoph Janiak
- Institute for Inorganic and Structure Chemistry, Heinrich-Heine-University, Düsseldorf, Germany
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31
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Enamullah M, Islam MA, Joy BA, Dittrich B, Reiss GJ, Janiak C. π–π interaction leading to an inversion-symmetric complex pair of Λ- and Δ-bis[N-2-(R-pyridyl)-2-oxo-1-naphthaldiminato-κ2N,O]zinc(II). Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.07.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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32
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Tang LH, Chen X, Jia AQ, Xin ZF, Zhang QF. Synthesis, characterization and crystal structures of ruthenium complexes with bidentate chiral salicylaldiminato ligands. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.04.052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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33
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Zehra S, Shavez Khan M, Ahmad I, Arjmand F. New tailored substituted benzothiazole Schiff base Cu(II)/Zn(II) antitumor drug entities: effect of substituents on DNA binding profile, antimicrobial and cytotoxic activity. J Biomol Struct Dyn 2018; 37:1863-1879. [DOI: 10.1080/07391102.2018.1467794] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Siffeen Zehra
- Department of Chemistry, Aligarh Muslim University , Aligarh
202002, Uttar Pradesh, India
| | - Mohammad Shavez Khan
- Department of Agricultural Microbiology, Aligarh Muslim University , Aligarh
202002, Uttar Pradesh, India
| | - Iqbal Ahmad
- Department of Agricultural Microbiology, Aligarh Muslim University , Aligarh
202002, Uttar Pradesh, India
| | - Farukh Arjmand
- Department of Chemistry, Aligarh Muslim University , Aligarh
202002, Uttar Pradesh, India
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34
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Enamullah M, Vasylyeva V, Quddus MA, Islam MK, Höfert SP, Janiak C. Spontaneous resolution of a Δ/Λ-chiral-at-metal pseudo-tetrahedral Schiff-base zinc complex to a racemic conglomerate with C–H⋯O organized 41- and 43-helices. CrystEngComm 2018. [DOI: 10.1039/c8ce00839f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Weak supramolecular interactions can be decisive!
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Affiliation(s)
| | - Vera Vasylyeva
- Institut für Anorganische Chemie und Strukturchemie
- Heinrich-Heine-Universität Düsseldorf
- D-40225 Düsseldorf
- Germany
| | | | | | - Simon-Patrick Höfert
- Institut für Anorganische Chemie und Strukturchemie
- Heinrich-Heine-Universität Düsseldorf
- D-40225 Düsseldorf
- Germany
| | - Christoph Janiak
- Institut für Anorganische Chemie und Strukturchemie
- Heinrich-Heine-Universität Düsseldorf
- D-40225 Düsseldorf
- Germany
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35
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Pescitelli G, Di Bari L. Revision of the Absolute Configuration of Preussilides A-F Established by the Exciton Chirality Method. JOURNAL OF NATURAL PRODUCTS 2017; 80:2855-2859. [PMID: 29039947 DOI: 10.1021/acs.jnatprod.7b00740] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In a recent contribution to this Journal (J. Nat. Prod. 2017, 80, 1531-1540), Noumeur et al. reported the isolation and structure elucidation of six novel polyketides named preussilides A-F, endowed with remarkable antiproliferative activity. The absolute configuration of the new compounds was established mainly by analyzing exciton-coupled electronic circular dichroism (ECD) spectra. However, the application of the exciton chirality method (ECM) was incorrect, because the chirality defined by transition moments was assigned in a wrong way. A correct application of the ECM, substantiated by time-dependent density functional theory (TDDFT) calculations of ECD spectra, led us to revise the absolute configuration of Preussilides A-F. A brief discussion on the criteria required for a correct application of the ECM is also presented.
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Affiliation(s)
- Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa , Via Moruzzi 13, 56124 Pisa, Italy
| | - Lorenzo Di Bari
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa , Via Moruzzi 13, 56124 Pisa, Italy
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36
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Enamullah M, Chamayou AC, Banu KS, Kautz AC, Janiak C. Copper(II)-salicylaldehydate/-methoxy(pyridine-2-yl)methanolate complexes via in-situ hydrolysis of Schiff bases. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2017.05.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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37
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Affiliation(s)
- Gennaro Pescitelli
- Dipartimento Di Chimica E Chimica Industriale; Università Di Pisa; Pisa Italy
| | - Lorenzo Di Bari
- Dipartimento Di Chimica E Chimica Industriale; Università Di Pisa; Pisa Italy
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38
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Distinct optoelectronic properties of four-coordinate and five-coordinate Zn(II) complexes with chiral polypyridine ligands. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.01.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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39
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Enamullah M, Quddus MA, Rahman MM, Burrow TE. Syntheses, spectroscopy, cyclic voltammetry, thermal analyses, EPR, and DFT/TDDFT on bis[N-2-(R-pyridyl)salicylaldiminato-κ2NˆO]copper(II) (R = H, 4/6-CH3). J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.11.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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40
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Azizi Talouki S, Grivani G, Crochet P, Cadierno V. Half-sandwich ruthenium(II) complexes with water-soluble Schiff base ligands: Synthesis and catalytic activity in transfer hydrogenation of carbonyl compounds. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2016.10.041] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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41
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Enamullah M, Islam MA, Joy BA, Reiss GJ. Bis[N-2-(R-pyridyl)-2-oxo-1-naphthaldiminato-κ2N^O]copper(II) (R = H, 4/6-CH3): Combined studies on syntheses, spectroscopy, cyclic voltammetry, thermal analyses, crystal structure and DFT/TDDFT. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.08.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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