| 11775677 |
Dendrinou-Samara C, Psomas G, Lordanidis L, Tangoulis V, Kessissoglu DP: 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. Chemistry. 2001 Dec 3;7(23):5041-51.
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. |
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