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Synthesis, PXRD structure, spectroscopy, cyclic voltammogram, thermal analysis and DFT/TD-DFT calculations of bis[salicylaldehydato-κO,O']nickel(II). Inorganica Chim Acta 2023. [DOI: 10.1016/j.ica.2023.121430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Woodhouse SS, Dais TN, Etcheverry-Berríos A, Brechin EK, Lane JR, Plieger PG. Against the Norm: Non Irving–Williams Transmetalation in Transition Metal Dimers. Inorg Chem 2022; 61:17819-17827. [DOI: 10.1021/acs.inorgchem.2c03113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sidney S. Woodhouse
- School of Natural Sciences, Massey University, Private Bag 11 222, Palmerston North4410, New Zealand
| | - Tyson N. Dais
- School of Natural Sciences, Massey University, Private Bag 11 222, Palmerston North4410, New Zealand
| | - Alvaro Etcheverry-Berríos
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, EdinburghEH93FJ, Scotland, U.K
| | - Euan K. Brechin
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, EdinburghEH93FJ, Scotland, U.K
| | - Joseph R. Lane
- Department of Chemistry, School of Science, University of Waikato, Private Bag, Hamilton3105, New Zealand
| | - Paul G. Plieger
- School of Natural Sciences, Massey University, Private Bag 11 222, Palmerston North4410, New Zealand
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Structural and Electronic (Absorption and Fluorescence) Properties of a Stable Triplet Diphenylcarbene: A DFT Study. J Fluoresc 2022; 32:1629-1638. [PMID: 35596854 DOI: 10.1007/s10895-022-02969-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 05/05/2022] [Indexed: 10/18/2022]
Abstract
A triplet diphenylcarbene, bis[3-bromo-5-(trifluoromethyl)[1,1'-biphenyl]-4-yl]methylidene (B3B), with exceptional stability was discovered by chemists from Japan's Mie University. To investigate its different quantum chemical features, a theoretical analysis was predicated on Density Functional Theory (DFT) and Time Dependent-DFT (TD-DFT) based technique. According to the findings, the singlet-triplet energy gap (ES-T), as well as HOMO-LUMO energy bandgap (EH-L), was found to be diminished when nucleophilicity (N) rose. We looked at the geometrical dimensions, molecular orbitals (MOs), electronic spectra, electrostatic potential, molecular surfaces, reactivity characteristics, and thermodynamics features of the title carbene (B3B). Its electronic spectra in different solvents were calculated using TD-DFT and Polarizable Continuum Model (PCM) framework. The estimated absorption maxima of B3B were seen between 327 and 340 nm, relying on the solvents, and were attributed to the S0 → S1 transition. Estimated fluorescence spectral peaks were found around 389 and 407 nm with the S1 and S0 transitions being identified. Its fluorescence/absorption intensities revealed a blue shift change when the solvent polarity was increased. The least exciting state has been discovered to be the π → π* charge-transfer (CT) phase. According to the Natural Bonding Orbital (NBO) exploration, ICT offers a significant role in chemical system destabilization. Furthermore, several hybrid features were used to determine the NLO (nonlinear optical) features (polarizability, first-order hyperpolarizability, and dipole moment). The calculated values suggest that B3B is a promising candidate for further research into nonlinear optical properties.
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Chemical stability of 1-substituted 2-aldimine- and 2-azobenzimidazoles under copper-promoted autoxidation. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.121038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Dey SK, Kumari S, Mandrekar S, Mhaldar SN, Harmalkar SS, Janiak C. Revisiting salicylidene-based anion receptors. RSC Adv 2021; 11:36850-36858. [PMID: 35494355 PMCID: PMC9043535 DOI: 10.1039/d1ra07677a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Accepted: 11/04/2021] [Indexed: 11/23/2022] Open
Abstract
Several salicylidene-based colorimetric and fluorimetric anion sensors are known in the literature. However, our 1H-NMR experimental results (in DMSO-d6) showed hydrolysis of imine (–N
Created by potrace 1.16, written by Peter Selinger 2001-2019
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CH–) bonds in salicylidene-based receptors (SL, CL1 and CL2) in the presence of quaternary ammonium salts (n-Bu4N+) of halides (Cl− and Br−) and oxo-anions (H2PO4−, HSO4− and CH3COO−). The mono-salicylidene compound CL1 showed the most extensive –NCH– bond hydrolysis in the presence of anions. In contrast, the di-salicylidene compound CL2 and the tris-salicylidene compound SL showed comparatively slow hydrolysis of –NCH– bonds in the presence of anions. Anion-induced imine bond cleavage in salicylidene compounds could easily be detected in 1H-NMR due to the appearance of the salicylaldehyde –CHO peak at 10.3 ppm which eventually became more intense over time, and the –NCH– peak at 8.9–9.0 ppm became considerably weaker. Furthermore, the formation of the salicylidene O–H⋯X− (X− = Cl−/Br−) hydrogen-bonded complex, peak broadening due to proton-exchange processes and keto–enol tautomerism have also been clearly observed in the 1H-NMR experiments. Control 1H-NMR experiments revealed that the presence of moisture in the organic solvents could result in gradual hydrolysis of the salicylidene compounds, and the rate of hydrolysis has further been enhanced significantly in the presence of an anion. Based on 1H-NMR results, we have proposed a general mechanism for the anion-induced hydrolysis of imine bonds in salicylidene-based receptors. Salicylidene Schiff bases undergo imine bond hydrolysis in the presence of halides and oxo-anions in aprotic media, raising fundamental questions on the applicability of salicylidene-based receptors as anion sensors.![]()
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Affiliation(s)
- Sandeep Kumar Dey
- School of Chemical Sciences, Goa University, Taleigao Plateau, Goa 403206, India
| | - Sonam Kumari
- School of Chemical Sciences, Goa University, Taleigao Plateau, Goa 403206, India
| | - Sonal Mandrekar
- School of Chemical Sciences, Goa University, Taleigao Plateau, Goa 403206, India
| | - Shashank N. Mhaldar
- School of Chemical Sciences, Goa University, Taleigao Plateau, Goa 403206, India
| | - Sarvesh S. Harmalkar
- School of Chemical Sciences, Goa University, Taleigao Plateau, Goa 403206, India
| | - Christoph Janiak
- Institute of Inorganic and Structural Chemistry, Heinrich-Heine University, 40204, Düsseldorf, Germany
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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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Sadhukhan D, Ghosh P, Ghanta S. Spectroscopic evidence of chirality in tetranuclear Cu(II)-Schiff base complexes, catalytic potential for oxidative kinetic resolution of racemic benzoin. INORG NANO-MET CHEM 2020. [DOI: 10.1080/24701556.2020.1852425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Dipali Sadhukhan
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Midnapur, West Bengal, India
| | - Prithwi Ghosh
- Department of Botany, Narajole Raj College, Narajole, Paschim Medinipur, West Bengal, India
| | - Susanta Ghanta
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Midnapur, West Bengal, India
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Iqbal M, Ali S, Sohail M, Tahir MN, Anderson PA. Mononuclear vs. binuclear carboxylates of copper(II) with 2,2′‐bipyridine: Synthesis, characterization, structural description, and properties. J CHIN CHEM SOC-TAIP 2019. [DOI: 10.1002/jccs.201900048] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Muhammad Iqbal
- Department of ChemistryBacha Khan University Charsadda Pakistan
| | - Saqib Ali
- Department of ChemistryQuaid‐i‐Azam University Islamabad Pakistan
| | - Manzar Sohail
- Department of Chemistry, School of Natural SciencesNational University of Science and Technology Islamabad Pakistan
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Tidjani Rahmouni N, Bensiradj NEH, Megatli SA, Djebbar S, Benali Baitich O. New mixed amino acids complexes of iron(III) and zinc(II) with isonitrosoacetophenone: Synthesis, spectral characterization, DFT study and anticancer activity. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 213:235-248. [PMID: 30695742 DOI: 10.1016/j.saa.2019.01.042] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Revised: 12/11/2018] [Accepted: 01/15/2019] [Indexed: 06/09/2023]
Abstract
New mixed Fe(III) and Zn(II) complexes with isonitrosoacetophenone (HINAP) and l-amino acids (such as l-histidine, l-phenylalanine and l-proline) have been synthesized and characterized by elemental analyses, UV-Vis, IR and ESR spectroscopy and thermal analyses. The values of molar conductance of the complexes in DMSO solution at 10-3 M concentration indicate their non-electrolyte nature. IR spectroscopy has revealed the coordination of deprotonated ligands to metal through nitrogen and oxygen atoms in an N2O2 arrangement. Density functional theory (DFT) calculations were performed using the hybrid functional of Truhlar and Zhao (M06) with basis set of double zeta quality LANL2DZ to evaluate the cis and trans coordination modes and to ascertain dipole moment, HOMO-LUMO energy gap, chemical hardness, softness and electrophilicity. The magnetic moments and ESR measurements suggest that there is an admixture of S = 5/2 and S = 1/2 spins in Fe(III) complexes. UV-Visible spectra indicate a distorted octahedral geometry around the metal ions. Thermal analyses show the presence of hydrated and coordinated water. The antimicrobial activity was investigated against (G+ and G-) bacteria (Staphylococcus aureus, bacillus subtilis, Escherichia coli, Pseudomonas aeruginosa) and fungi (Candida albicans). The iron and zinc complexes were found to be more active against Gram-positive than Gram negative bacteria. They also show considerable growth inhibition against the fungi tested. In vitro antitumor activity assayed against cancer cell lines of the HEP2 type (cancer cells of the larynx) exhibited significant toxicity of the ligands and their mixed complexes.
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Affiliation(s)
- Nabila Tidjani Rahmouni
- Laboratoire d'Hydrométallurgie et Chimie Inorganique Moléculaire, Faculté de Chimie, USTHB, BP 32 El Alia, Bab Ezzouar, Algiers, Algeria.
| | - Nour El Houda Bensiradj
- Laboratoire de Chimie Théorique Computationnelle et Photonique, Faculté de Chimie, BP 32 El Alia, Bab Ezzouar, Algiers, Algeria
| | - Sid Ahmed Megatli
- Laboratoire d'Hydrométallurgie et Chimie Inorganique Moléculaire, Faculté de Chimie, USTHB, BP 32 El Alia, Bab Ezzouar, Algiers, Algeria
| | - Safia Djebbar
- Laboratoire d'Hydrométallurgie et Chimie Inorganique Moléculaire, Faculté de Chimie, USTHB, BP 32 El Alia, Bab Ezzouar, Algiers, Algeria
| | - Ouassini Benali Baitich
- Laboratoire d'Hydrométallurgie et Chimie Inorganique Moléculaire, Faculté de Chimie, USTHB, BP 32 El Alia, Bab Ezzouar, Algiers, Algeria
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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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Mayans J, Roc L, Font-Bardia M, Escuer A. Decanuclear Fe III clusters with hemiacetal ligands: a new {M 10(μ 3-O) 8} cluster core. Dalton Trans 2019; 48:13139-13142. [DOI: 10.1039/c9dt01568j] [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 characterization of a FeIII10 cluster with α-methyl-2-pyridinemethanolate lead us to explore the direct syntheses of medium nuclearity FeIII clusters with aldehydes in methanol. The complexes exhibit an unprecedented {Fe10(μ3-O)8} cluster core.
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Affiliation(s)
- J. Mayans
- Departament de Química Inorgànica i Orgànica
- Secció Inorgànica and Institute of Nanoscience (IN2UB) and Nanotecnology
- Universitat de Barcelona
- Barcelona-08028
- Spain
| | - L. Roc
- Departament de Química Inorgànica i Orgànica
- Secció Inorgànica and Institute of Nanoscience (IN2UB) and Nanotecnology
- Universitat de Barcelona
- Barcelona-08028
- Spain
| | - M. Font-Bardia
- Departament de Mineralogia
- Cristal·lografia i Dipòsits Minerals and Unitat de Difracció de R-X. Centre Científic i Tecnològic de la Universitat de Barcelona (CCiTUB)
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - A. Escuer
- Departament de Química Inorgànica i Orgànica
- Secció Inorgànica and Institute of Nanoscience (IN2UB) and Nanotecnology
- Universitat de Barcelona
- Barcelona-08028
- Spain
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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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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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