title: Host-guest interaction of 12-MC-4, 15-MC-5, and fused 12-MC-4 metallacrowns with mononuclear and binuclear carboxylato complexes: structure and magnetic behavior.
abstract: Interaction of manganese with salicylhydroxamic ligands leads to the formation of the 12-membered metallacrown [Mn(II)(2(2,4-DP)2(HCOO)2]-[12-MC(Mn(III)N(shi)-4](py)6 (2) (H-2,4-DP =2-(2,4-dichlorophenoxy)propionic acid) and the 15-membered metallacrown [Mn(II)(2,4-D)2][15-MC(Mn(III)N(shi)-5](py)6 (1) (H-2,4-D = 2,4-dichlorophenoxyacetic acid). The crystal structure analysis shows that mononuclear and dinuclear alkanoato complexes are accommodated in the cavity of the metallacrown ring. The magnetic behaviour of 1 and 2 and the magnetic behaviour of the fused 12-membered metallacrown [Ni(II)(mcpa)]2-[12-MC(Ni(II)N(shi)2(pko)2-4][12-MC(Ni(II)N(shi)3(pko)-4]-(CH3OH)3(H2O) (3) (Hmcpa = 2-methyl-4-chlorophenoxyacetic acid) have shown that the zero field and/or the population of many energy levels at low temperatures is the reason for the divergence of the susceptibility data at high fields. For compound 3, the ground state is S = 0, with S = 1 and S = 2 low-lying excited states. This leads to a non-Brillouin behaviour of the magnetisation, since the ground state is very close to the excited states.
authors.affiliation: Department of General and Inorganic Chemistry, Aristotle University of Thessaloniki, Greece.
authors.forename: C
authors.initials: C
authors.lastname: Dendrinou-Samara
authors.forename: G
authors.initials: G
authors.lastname: Psomas
authors.forename: L
authors.initials: L
authors.lastname: Lordanidis
authors.forename: V
authors.initials: V
authors.lastname: Tangoulis
authors.forename: D P
authors.initials: DP
authors.lastname: Kessissoglu
mesh_terms: D004988:Ethers, Cyclic / Q000737:chemistry*; D008024:Ligands; D008280:Magnetics; D008345:Manganese; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D012457:Salicylamides / Q000737:chemistry
chemical_list: D004988:Ethers, Cyclic; D008024:Ligands; D009942:Organometallic Compounds; D012457:Salicylamides; D008345:Manganese; C005703:salicylhydroxamic acid