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DFT and TDDFT exploration on the role of pyridyl ligands with copper toward bonding aspects and light harvesting

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Abstract

Context

Schiff base-containing metal complexes have been the subject of extensive research. In this work, a coordination polymer-derived complex called [Cu(L)] that is solution-stable (L = 2-(2-hydroxybenzylidene-amino)phenol) has been explored theoretically with five different pyridyl-based ligands using DFT/TDDFT in order to understand the structural–functional and electronic transitions of these five complexes. Frontier molecular orbital (FMO) analysis was carried out to assess the reactivity behavior of all five complexes. For the purpose of studying the charge energy distribution over complexes, electrostatic potential maps were also drawn. Furthermore, in order to identify any stabilizing interactions that may be present in the given complexes, an NBO analysis was studied. To learn more about any potential correlations between the properties of these five complexes, a comparative analysis was explored. Our calculations demonstrate that complex 3 having pyridine-4-carboxamide as a ligand has a lower energy gap and a higher negative electrostatic potential which may indicate its higher reactivity and this may be due to the electron withdrawing group (carboxamide). TDDFT results show that the highest light harvesting efficiency (LHE) of all the studied complexes is found in the range of 440–448 nm. Complexes 1, 2, and 4 show the higher light harvesting efficiency as compared to complexes 3 and 5. Our findings are in good accordance with the available experimental data.

Methods

All DFT computations were performed using the Gaussian16 with unrestricted B3LYP-D2 functional with the basis sets 6-31G(d,p) for O, N, C, and H while LanL2DZ for Cu. The polarized continuum model (PCM) was used for the solvation. The software GaussView6.1 was utilized for the modeling of initial geometries and the plotting of MEP maps. The NBO6.0 program which is incorporated in Gaussian16 was utilized to investigate the bonding nature and stabilization energies of the complexes. The ORCA program was used to simulate the absorption spectra.

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Acknowledgements

AA would like to thank the Central University of Haryana for providing computing facilities.

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MA would like to thank the Central University of Haryana for its financial support.

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  1. Department of Chemistry, Central University of Haryana, Mahendergarh, Haryana, 123031, India

    Mukhtar Ahmed, Manoj Kumar Gupta & Azaj Ansari

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  1. Mukhtar Ahmed
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Mukhtar Ahmed: calculations, validation, visualization, writing—original draft; Manoj Kumar Gupta: editing; Azaj Ansari: supervised this research.

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Ahmed, M., Gupta, M.K. & Ansari, A. DFT and TDDFT exploration on the role of pyridyl ligands with copper toward bonding aspects and light harvesting. J Mol Model 29, 358 (2023). https://doi.org/10.1007/s00894-023-05765-4

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