title: 15-MC-5 manganese metallacrowns hosting herbicide complexes. Structure and bioactivity.
abstract: Interaction of manganese with salicylhydroxamic ligands leads to the formation of a series of 15-membered metallacrown Mn(II)(L)(2)[15-MC(Mn(III)N(shi))-5](py)(6) (L=alkanoato ligand). The crystal structure contains a neutral 15-membered metallacrown ring of the type [15-MC(Mn(III)N(shi))-5]. The metallacrown core consists of five Mn(III) and five shi(-3) ligands. The 15-membered metallacrown ring is formed by the succession of five structural moieties of the type [Mn(III)-N-O]. The diversity in the configuration (planar or propeller) for the ring Mn(III) ions gives to the metallacrown core flexibility and simultaneously allows the encapsulation of the sixth Mn(II). The encapsulated Mn(II) is seven-coordinate and is bound to the five hydroximate oxygen donors provided by the metallacrown core, and two oxygen atoms from the carboxylate herbicide ligands. Antibacterial screening data showed that among all the compounds tested, manganese metallacrowns are more active than the simple manganese herbicide or carboxylate complexes while an increase in the efficiency of [15-MC(Mn(III)N(shi))-5] towards the analogous [12-MC(Mn(III)N(shi))-4] can be observed.
authors.affiliation: Laboratory of Inorganic Chemistry, Department of General and Inorganic Chemistry, Aristotle University of Thessaloniki, 54006, Thessaloniki, Greece.
authors.forename: Catherine
authors.initials: C
authors.lastname: Dendrinou-Samara
authors.forename: Lito
authors.initials: L
authors.lastname: Alevizopoulou
authors.forename: Lykourgos
authors.initials: L
authors.lastname: Iordanidis
authors.forename: Elias
authors.initials: E
authors.lastname: Samaras
authors.forename: Dimitris P
authors.initials: DP
authors.lastname: Kessissoglou
mesh_terms: D001419:Bacteria / Q000187:drug effects*; D018360:Crystallography, X-Ray; D008345:Manganese / Q000737:chemistry*; D008826:Microbial Sensitivity Tests; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D013329:Structure-Activity Relationship
chemical_list: D009942:Organometallic Compounds; D008345:Manganese