title: Synthesis, structure and antimicrobial activity of manganese(II) and cobalt(II) complexes of the polyether ionophore antibiotic Sodium Monensin A.
abstract: Mononuclear neutral manganese(II) and cobalt(II) complexes with the antibiotic Sodium Monensin A (Mon-Na, 1b) were synthesized and characterized. The crystal structures of M(Mon-Na)2Cl2.H2O (M=Mn, 2; M=Co, 3) were determined by X-ray crystallography. The complexes crystallize in monoclinic space group C2 with a tetrahedrally coordinated transition metal attached to oxygen atoms of deprotonated carboxyl groups of two Sodium Monensin molecules and two chloride ions. The sodium ion remains in the cavity of the ligand and cannot be replaced by Mn(II) or Co(II). The complexes were additionally characterized by different spectroscopic techniques (UV-Visible, EPR, FAB-MS). A preferable octahedral environment around the transition metal centers is observed in polar solvents while the complexes retain their tetrahedral structure in non-polar media. The antimicrobial activity of 1b, 2 and 3 was tested against Gram(+) and Gram(-) bacteria.
authors: Department of Analytical Chemistry, Faculty of Chemistry, Sofia University, 1, J. Bourchier Blvd., 1164 Sofia, Bulgaria.
authors: Petar
authors: P
authors: Dorkov
authors: Ivayla N
authors: IN
authors: Pantcheva
authors: William S
authors: WS
authors: Sheldrick
authors: Heike
authors: H
authors: Mayer-Figge
authors: Rositza
authors: R
authors: Petrova
authors: Mariana
authors: M
authors: Mitewa
mesh_terms: D001409:Bacillus cereus / Q000187:drug effects; D001412:Bacillus subtilis / Q000187:drug effects; D003035:Cobalt / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray; D004926:Escherichia coli / Q000187:drug effects; D006860:Hydrogen Bonding; D008345:Manganese / Q000737:chemistry*; D008826:Microbial Sensitivity Tests; D008985:Monensin / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D012477:Salmonella enteritidis / Q000187:drug effects; D012505:Sarcina / Q000187:drug effects; D013055:Spectrophotometry, Infrared
chemical_list: D003035:Cobalt; D008345:Manganese; D008985:Monensin