A Quantum Chemical Screening of Two Imidazole-Chalcone Hybrid Ligands and Their Pd, Pt and Zn Complexes for Charge Transport and Nonlinear Optical (NLO) Properties: A DFT Study — Oak Academic Publishing
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A Quantum Chemical Screening of Two Imidazole-Chalcone Hybrid Ligands and Their Pd, Pt and Zn Complexes for Charge Transport and Nonlinear Optical (NLO) Properties: A DFT Study
Research Unit of Noxious Chemistry and Environmental Engineering, Department of Chemistry, Faculty of Science, Univer-sity of Dschang, Dschang, Cameroon
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Research Unit of Noxious Chemistry and Environmental Engineering, Department of Chemistry, Faculty of Science, Univer-sity of Dschang, Dschang, Cameroon
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Research Unit of Noxious Chemistry and Environmental Engineering, Department of Chemistry, Faculty of Science, Univer-sity of Dschang, Dschang, Cameroon · Department of Chemistry, Faculty of Science, The University of Bamenda, Bambili-Bamenda, Cameroon
1 Research Unit of Noxious Chemistry and Environmental Engineering, Department of Chemistry, Faculty of Science, Univer-sity of Dschang, Dschang, Cameroon
2 Department of Chemistry, Faculty of Science, The University of Bamenda, Bambili-Bamenda, Cameroon
A quantum chemical screening of two imidazole-based chalcone ligands: 2- [1-(3-(1H-imidazol-1-yl)propylimino)-3-(phenylallyl)]phenol and 2-[1-(3-(1H- imidazol-1-yl)propylimino)-3-4-nitrophenylallyl]phenol (hereinafter referred to as HL1 and HL2 respectively) and their Pd, Pt and Zn chelates for charge transport and nonlinear optical (NLO) properties, is reported via dispersion- corrected density functional theory (DFT-D3) and time-dependent DFT (TD- DFT) methods. From our results, Pd and Pt complexes have been observed to show excellent hole-transport properties, owing to their very small reorganization energies. The light extraction efficiency of the HL1-Pt complex was deduced to be particularly impressive, thus suitable for the manufacture of hole transport layer in violet light emitting diodes (LEDs). Moreover, redox potentials and chemical stability studies have enabled us to validate the greater stability in moisture (towards oxidation), of HL2 complexes compared to their HL1 counterparts. The first and second hyperpolarizabilities of both ligands and their complexes have been found to be outstandingly higher than those of the push-pull prototypical, para-nitroaniline by factors of up to 12 in the case of HL2. These compounds, with the exception of the HL2-Pt complex, are thus interesting candidates having wide transparency tradeoffs for NLO efficiency in the manufacture of optoelectronic and photonic devices capable of second and third-order NLO response. Finally, metal chelation has been established to enhance the NLO response of all the chalcone-based imidazole ligands investigated as a result of metal-ligand charge transfer and ligand- metal charge transfer electronic transitions identified in the resulting complexes with the exception of the zinc complexes.
KeywordsDensity Functional TheoryTime-Dependent Density Functional TheoryChalcone-ImidazolesCharge Transport and Nonlinear Optical Properties
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