Cationic cobaltammines as anion receptors: Sonochemical synthesis, characterization and comparative account of antibacterial activity of nano and non-nano pentaammineazidocoablt(III) compounds

Bala, Ritu; Behal, Jagriti; Sharma, Raj Pal; Prakash, Vinit; Mayer, Peter; Piotrowski, Holger; Schutt, Thomas und Klapotke, Thomas M. (2021): Cationic cobaltammines as anion receptors: Sonochemical synthesis, characterization and comparative account of antibacterial activity of nano and non-nano pentaammineazidocoablt(III) compounds. In: Polyhedron, Bd. 206, 115338

Abstract

Sonochemical technique has lead the synthesis of nano-scale cobalt(III) compounds from pentaammineazidocobalt(III) chloride and sodium salts of metal oxoanions (Na2MO4 center dot 2H(2)O, M = Mo or W) in an aqueous medium. These dark red coloured particles have composition [Co(NH3)(5)N-3]MO4 (M = Mo or W) and further characterization by UV-Vis, IR, SEM, Zeta-sizer and PXRD. Through classical method their crystals have also been grown and their characterization has been done by UV-Vis, IR, PXRD and SCXRD. Thermal stability of single crystalline and nano-scale cobalt(III) compounds have been determined by thermal gravimetric analysis. The binding ability of pentaammineazidocobalt(III) cation for oxoanions has been observed (in an aqueous solution) with UV-Vis spectroscopic titrations (log k = 2.35 (MoO42-), 3.76 (WO42-). Single crystal X-ray structures of both the compounds have revealed the presence of one cation and one anion. Electrostatic forces of attraction and strong H-bonding interactions (N-H center dot center dot center dot O) have stabilized crystal lattices in both the structures. All compounds along with sodium salts of oxoanions has further revealed their antibacterial activities using a strain of gram negative bacteria, a strain of gram positive bacteria and acid fast bacteria (Escherichia coli, Bacillus thuringiensis and Mycobacterium smegmatis respectively). This study predicts that these new nano compounds have two-fold more inhibitory activity as compared to the normal crystalline compounds and sodium salts of oxoanions.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Chemie und Pharmazie > Department Chemie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 540 Chemie
• ISSN: 0277-5387
• Sprache: Englisch