Structural, computational and antimicrobial studies of 2–[(E)–[2–(2,4,6-trimethylbenzenesulfonyl)-hydrazinylidene] methyl] benzoic acid and its Cu(II), Zn(II) and Co(II) complexes

Synthesis, Structure, Hirshfeld Surface Analysis, Non-Covalent Interaction, and In Silico Studies of 4-Hydroxy-1-[(4-Nitrophenyl)Sulfonyl]Pyrrolidine-2-Carboxyllic Acid

The new compound 4-hydroxy-1-[(4-nitrophenyl)sulfonyl]pyrrolidine-2-carboxyllic acid was obtained by the reaction of 4-hydroxyproline with 4-nitrobenzenesulfonyl chloride. The compound was characterized using single crystal X-ray diffraction studies. Spectroscopic methods including NMR, FTIR, ES-MS, and UV were employed for further structural analysis of the synthesized compound. The title compound was found to have crystallized in an orthorhombic crystal system with space group P212121. The S1-N1 bond length of 1.628 (2) Å was a strong indication of the formation of the title compound. The absence of characteristic downfield 1H NMR peak of pyrrolidine ring and the presence of S-N stretching vibration at 857.82 cm-1 on the FTIR are strong indications for the formation of the sulfonamide. The experimental study was complemented with computations at the B3LYP/6-311G +  + (d,p) level of theory to gain more understanding of interactions in the compound at the molecular level. Noncovalent interaction, Hirsfeld surface analysis and interaction energy calculations were employed in the analysis of the supramolecular architecture of the compound. Predicted ADMET parameters, awarded suitable bioavailability credentials, while the molecular docking study indicated that the compound enchants promising inhibition prospects against dihydropteroate synthase, DNA topoisomerase, and SARS-CoV-2 spike.

Graphical Abstract

Herein we present the solid state structure, noncovalent interaction and spectroscopic analysis of a prospective bioactive compound 4-hydroxy-1-[(4-nitrophenyl)sulphonyl]pyrrolidine-2-carboxyllic acid.

Supplementary Information

The online version contains supplementary material available at 10.1007/s10870-023-00978-0.

The role of natural biological macromolecules: Deoxyribonucleic and ribonucleic acids in the formulation of new stable charge transfer complexes of thiophene Schiff bases for various life applications

The ecofriendly cellulose and gelatin provided sustainable and abundant sugars: d-ribofuranose, and 2-Deoxy-ribofuranose (starting reactants for preparative synthetic green chemistry pathways of charge transfer complexes. The natural available sugars d-ribofuranose, and 2-Deoxy-ribofuranose were obtained from facile hydrolysis of cellulose and gelatin natural macromolecules. Successive, low cost and facile alkaline- and acid hydrolysis of Deoxyribonucleic acid (DNA, from gelatin animal source) and ribonucleic acid (RNA, from cellulose plant source) yield the simple sugars: d-ribofuranose and 2-Deoxy-ribofuranose. Eight optically and biologically active charge transfer complexes were prepared from the reaction of the above sugars efficiently intercalated with two new prepared thiophene Schiff Lewis (electron donors) bases: 2-((2Hydroxybenzylidene) amino)-4, 5, 6, 7-tetrahydrobenzo [b] thiophene-3-carbonitrile (D1, 2-((Furan-2ylmethylene) amino) 4,5,6,7 tetrahydrobenzo [b] thiophene-3-carbonitrile (D2). The chemical structures of these prepared Schiff bases were confirmed using the mass spectra. The successful intercalation of the sugar units with the Lewis bases was ascertained using powder x ray diffraction. The molecular structures of the reaction products were proposed based on FTIR, ¹H NMR. The optical activity of charge transfer complexes were confirmed using UV-Vis. Absorption spectroscopy. The surface morphology, microstructures, and particle size of the donors and charge transfer complexes were determined using scanning electron microscopy (SEM). The Lewis bases (D1) and (D2) showed no antimicrobial activity, while their charge transfer complexes showed good antimicrobial activity, suggesting their pharmaceutical and medicinal applications due to the potent biological activity against wide spread microbial microorganisms of Gram positive and Gram positive bacteria as well as some fungal species.