A novel copper (II) complex containing pyrimidine-4-carboxylic acid: Synthesis, crystal structure, DFT studies, and molecular docking

The role of biochemical and biophysical properties, molecular docking and dynamics studies on azelastine

The structure of the 4-(4-chlorobenzyl)-2-(1-methylazepan-4-yl) phthalazin-1(2H)-one (IA) was optimized through computational study. The optimized structure revealed that the bond length between atoms C3 and C5 was the longest at 1.54 Å, while the bond between atoms C10 and H31 had the lowest length at about 1.01 Å, respectively. The natural bond orbital (NBO) analysis indicates that the bonding π(C3-C20) to anti-bonding π∗(N2-C3) interaction exhibits the most significant stabilization energy of about 253.59 kcal/mol. Due to the solvent's influence, the gas phase MEP value and HOMO-LUMO band gap value are lower, when compared to solvents. A localized bond pair that undergoes movement between two atoms, and a bond pair that undergoes movement between two different pairs of atoms are identified by electron localized function (ELF), localized orbital locator (LOL), and average localized ionization energy (ALIE) studies, respectively. The electron density and thermodynamic properties were determined using Gaussian software. This study examined various parameters such as non-linear optical (NLO), molecular electrostatic potential (MEP), UV-vis, and HOMO-LUMO in different solvents. Further, the biological activity of the IA compound was studied using molecular docking and dynamics on the target Mycobacterium tuberculosis ArgF (7NOR) protein, which showed favorable protein-ligand interaction energy.

The effect of complex formation on the static and frequency-dependent nonlinear optical properties: A combined experimental and theoretical investigation

A novel mixed ligand Mn(II) complex of 6-Bromopyridine-2-carboxylic acid (6Brpca) and 4,4'-dimethyl-2,2'-dipyridyl has been prepared and structurally characterized using single-crystal X-ray diffraction. The spectroscopic properties were also analyzed by using FT-IR and UV-Vis spectral techniques. The coordination complexes having transition metal ions are known to have promising optical nonlinearity behavior. Therefore, B3LYP level density functional theory was used to investigate first- and second-order hyperpolarizabilities (β and γ) and provide a deep understanding of the relation between the structure and NLO properties. The calculations of frequency-dependent α, β, and γ at frequencies of ω = 0.0856252 and 0.0428126 au. for 6Brpca and Dmdpy ligands as well as Mn(II) complex have been also carried out using B3LYP/LanL2DZ level. Especially second harmonic generation (SHG) first and second hyperpolarizabilities (β(-2ω;ω,ω) and γ (-2ω;ω,ω,0)) parameters for Mn(II) complex have been calculated as 11448 × 10-30 and 680035 × 10-36 esu, respectively. It has been determined that there is a tremendous increase in β and γ parameters when 6Brpca and Dmdpy ligands coordinate to the high spin multiplicity Mn(II) ion. Theoretical calculations revealed that the large first- and second-order hyperpolarizabilities are caused by strong intramolecular charge transfer between the transition metal and the coordinated ligands. These results indicate that the the organometallic complex under investigation is valuable candidate for optoelectronic and photonic applications.