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Enamullah M, Haque I, Resma AK, Woschko D, Janiak C. Schiff Base in Ketoamine Form and Rh(η 4-cod)-Schiff Base Complex with Z' = 2 Structure from Pairwise C-H···Metallochelate-π Contacts. MOLECULES (BASEL, SWITZERLAND) 2022; 28:molecules28010172. [PMID: 36615366 PMCID: PMC9821875 DOI: 10.3390/molecules28010172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/14/2022] [Accepted: 12/19/2022] [Indexed: 12/28/2022]
Abstract
Condensation of 2-hydroxybenzaldehyde (salicylaldehyde) or 2-hydroxy-1-naphthaldehyde with 2-ethylaniline yields the Schiff base compound of (E)-2-(((2-ethylphenyl)imino)methyl)phenol (HL1) or (E)-1-(((2-ethylphenyl)imino)methyl)naphthalen-2-ol (HL2), which in turn react with the dinuclear complex of [Rh(η4-cod)(µ-O2CCH3)]2 (cod = cycloocta-1,5-diene) to afford the mononuclear (η4-cod){(E)-2-(((2-ethylphenyl)imino)methyl)phenolato-κ2N,O}rhodium(I), [Rh(η4-cod)(L1)] (1) or (η4-cod){(E)-1-(((2-ethylphenyl)imino)methyl)naphthalen-2-olato-κ2N,O}rhodium(I), [Rh(η4-cod)(L2)] (2) (L1 or L2 = deprotonated Schiff base ligand). The X-ray structure determination revealed that the HL2 exists in the solid state not as the usual (imine)N···H-O(phenol) form (enolamine form) but as the zwitterionic (imine)N-H+···-O(phenol) form (ketoamine form). 1H NMR spectra for HL2 in different solvents demonstrated the existence of keto-enol tautomerism (i.e., keto ⇆ enol equilibrium) in solution. The structure for 1 and 2 showed that the deprotonated Schiff base ligand coordinates to the Rh(η4-cod)-fragment as a six-membered N^O-chelate around the rhodium atom with a close-to-square-planar geometry. Two symmetry-independent molecules (with Rh1 and Rh2) were found in the asymmetric unit in 1 in a structure with Z' = 2. The supramolecular packing in HL2 was organized by π-π and C-H···π contacts, while only two recognized C-H···π contacts were revealed in 1 and 2. Remarkably, there were reciprocal or pairwise C-H···π contacts between a pair of each of the symmetry-independent molecules in 1. This pairwise C-H contact to the Rh-N^O chelate (metalloaromatic) ring may be a reason for the two symmetry-independent molecules in 1. Differential scanning calorimetry (DSC) analyses revealed an irreversible phase transformation from the crystalline-solid to the isotropic-liquid phase and subsequently confirmed the thermal stability of the compounds. Absorption spectra in solution were explained by excited state properties from DFT/TD-DFT calculations.
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Affiliation(s)
- Mohammed Enamullah
- Department of Chemistry, Jahangirnagar University, Dhaka 1342, Bangladesh
- Correspondence: (M.E.); (C.J.)
| | - Imdadul Haque
- Department of Chemistry, Jahangirnagar University, Dhaka 1342, Bangladesh
| | - Amina Khan Resma
- Department of Chemistry, Jahangirnagar University, Dhaka 1342, Bangladesh
| | - Dennis Woschko
- Institut für Anorganische Chemie und Strukturchemie, Universität Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany
| | - Christoph Janiak
- Institut für Anorganische Chemie und Strukturchemie, Universität Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany
- Correspondence: (M.E.); (C.J.)
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Rahman MS, Hossain SM, Rahman MT, Halim MA, Ishtiak MN, Kabir M. Determination of trace metal concentration in compost, DAP, and TSP fertilizers by neutron activation analysis (NAA) and insights from density functional theory calculations. ENVIRONMENTAL MONITORING AND ASSESSMENT 2017; 189:618. [PMID: 29119383 DOI: 10.1007/s10661-017-6328-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 10/24/2017] [Indexed: 06/07/2023]
Abstract
Leaching of toxic metals from fertilizers is a growing concern in an agricultural country like Bangladesh due to the serious consequences in health and food chain. Fertilizers used in farming fields and nurseries (plant sales outlet) in the mid-southern part of Bangladesh were collected for the determination of toxic metals. This study employed the neutron activation method and a relative standardization approach. Three standard/certified reference materials, namely NIST coal fly ash 1633b, IAEA-Soil-7, and IAEA-SL-1 (lake sediment), were considered for elemental quantification. Concentration of As (2.63-16.73 mg/kg), Cr (40.93-261.77 mg/kg), Sb (0.47-63.58 mg/kg), Th (1.44-19.16 mg/kg), and U (1.90-209.41 mg/kg) were determined in fertilizers. High concentrations of Cr, Sb, and U were detected in some compost and phosphate fertilizers (TSP and diammonium phosphate (DAP)) in comparison with the IAEA/European market standard and other studies. Quantum mechanical calculations were performed to understand the molecular level interaction of CrO3, Sb2O3, and AsO3, with DAP by employing density functional theory with the B3LYP/SDD level of theory. Our results indicated that CrO3 and Sb2O3 have strong binding affinity with DAP compared to AsO3, which supports the experimental results. These compounds attached to the phosphate group through covalent-like bonding with oxygen. The frontier molecular orbital calculation indicated that HOMO-LUMO gap of the AsO3-DAP (5.46 eV) and Sb2O3-DAP (6.48 eV) complexes are relatively lower than the CrO3-DAP, which indicates that As and Sb oxides are chemically more prone to attach with the phosphate group of DAP fertilizer.
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Affiliation(s)
- Md Sajjadur Rahman
- Department of Chemistry and Biochemistry, South Dakota State University, Brookings, SD, 57007, USA
| | - Syed Mohammod Hossain
- Reactor and Neutron Physics Division, INST, Atomic Energy Research Establishment, Savar, GPO Box-3787, Dhaka, 1000, Bangladesh
| | - Mir Tamzid Rahman
- Department of Chemistry, Jahangirnagar University, Savar, Dhaka, 1342, Bangladesh.
| | - Mohammad A Halim
- Division of Quantum Chemistry, Green Research Centre, BICCB, 38 Green Road West, Dhaka, 1205, Bangladesh
| | - Mohammad Niaz Ishtiak
- Division of Quantum Chemistry, Green Research Centre, BICCB, 38 Green Road West, Dhaka, 1205, Bangladesh
| | - Mahbub Kabir
- Department of Chemistry, Jahangirnagar University, Savar, Dhaka, 1342, Bangladesh
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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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Synthesis, characterization, density functional study and antimicrobial evaluation of a series of bischelated complexes with a dithiocarbazate Schiff base ligand. ARAB J CHEM 2017. [DOI: 10.1016/j.arabjc.2016.07.019] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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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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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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Enamullah M, Islam MA, Janiak C. Rh{(η4-cod) or (PPh3)2}-Schiff base complexes with a Z′=2 structure: Syntheses, spectroscopy, thermalanalyses and DFT/TDDFT. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.05.093] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Enamullah M, Makhloufi G, Ahmed R, Joy BA, Islam MA, Padula D, Hunter H, Pescitelli G, Janiak C. Synthesis, X-ray, and Spectroscopic Study of Dissymmetric Tetrahedral Zinc(II) Complexes from Chiral Schiff Base Naphthaldiminate Ligands with Apparent Exception to the ECD Exciton Chirality. Inorg Chem 2016; 55:6449-64. [DOI: 10.1021/acs.inorgchem.6b00403] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Mohammed Enamullah
- Department of Chemistry, Jahangirnagar University, Dhaka-1342, Bangladesh
- Department of Chemistry, York University, 4700 Keele Street, Toronto, Canada
| | - Gamall Makhloufi
- Institut
für Anorganische Chemie und Strukturchemie, Universität Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany
| | - Rifat Ahmed
- Department of Chemistry, Jahangirnagar University, Dhaka-1342, Bangladesh
| | - Baitul Alif Joy
- Department of Chemistry, Jahangirnagar University, Dhaka-1342, Bangladesh
| | | | - Daniele Padula
- Department of Chemistry, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy
| | - Howard Hunter
- Department of Chemistry, York University, 4700 Keele Street, Toronto, Canada
| | - Gennaro Pescitelli
- Department of Chemistry, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy
| | - Christoph Janiak
- Institut
für Anorganische Chemie und Strukturchemie, Universität Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany
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Enamullah M, Quddus MA, Hasan MR, Pescitelli G, Berardozzi R, Makhloufi G, Vasylyeva V, Janiak C. Chirality at metal and helical ligand folding in optical isomers of chiral bis(naphthaldiminato)nickel(ii) complexes. Dalton Trans 2016; 45:667-80. [DOI: 10.1039/c5dt03940a] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ni-Schiff base complexes combine ligand chirality, chirality at metal, and helical ligand folding in a concerted way.
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Affiliation(s)
| | | | | | | | | | - Gamall Makhloufi
- Institut für Anorganische Chemie und Strukturchemie
- Universität Düsseldorf
- D-40225 Düsseldorf
- Germany
| | - Vera Vasylyeva
- Institut für Anorganische Chemie und Strukturchemie
- Universität Düsseldorf
- D-40225 Düsseldorf
- Germany
| | - Christoph Janiak
- Institut für Anorganische Chemie und Strukturchemie
- Universität Düsseldorf
- D-40225 Düsseldorf
- Germany
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