| Polynuclear metal complexes is one of the most active research topics of current coordination chemistry, not only because of their nanoscale and aesthetically pleasing molecular structures, but also because of their interesting luminescent, electronic, magnetic and catalytic properties. However, most of the works have so far been focused on polynuclear transistion metal complexes, while heterometallic 3d-4f clusters have seldom explored. In view of thinking, we have designed and synthesized several transition metal complexes and 3d-4f polynuclear clusters, and the crystal structure and properties were investigated. The main contents are following:(1) Through condensing 3-carboxysalicylidene and 2-methyl-2-amino-1,3-propanediol, one new Schiff base H4L1[H4L1=(E)-3-((1,3-dihydroxy-2-methylpropan-2-ylimino)methyl)-2-hydroxybenzoic acid], using the ligand, we have synthesized three cobalt complexes [Co(HL1)]4·4H2O (1), [Co(HL1)]4·2CH3OH·1.32H2O (2) and [Co2(L1)(N3)]2·4CH3OH (3), complex 3 is a mixed-valence tetranuclear cobalt clusters. Their crystal structures were characterized by elemental analysis, IR, UV and X-ray diffraction.(2) Using the ligand H2L2 [H2L2=3-carboxysalicylidene] and Cu(ClO4)2·6H2O, under the right conditions to add some ancillary ligands, the compounds [(CuL2)(2,2'-bpy)(H2O)] (4), {[(CuL2)(2,2'-bpy)]2Cu(2,2'-bpy)·2ClO4}n (5), [Cu(HL2)(L2)(2,2'-bpy)]2 (6) and [(CuL2)2(bbi)·2ClO4·4H2O] (7)[bbi=1,1'-(1,4-Butanediyl)bis(imidazole)] have been synthesized. Their crystal structures were characterized by elemental analysis, IR, UV and X-ray diffraction. Magnetic susceptibility of measurements for (5) and (7) indicaste that the interaction between metal ions are antiferromagnetic.(3) Using 3-carboxysalicylidene and N1-(3-aminopropyl)propane-1,3-diamine, we have prepared the flexible ligand H5L3[H5L3=3,3′-(1Z,1′Z)-(3,3′-azanediylbis(propane-3,1-diyl)bis(azan-1-yl-1-ylidene))bis(methan-1-yl-1-ylidene)bis(2-hydroxybenzoic acid)], the compounds [Cu(H2L3)] (8) and 1D helical chain {[(Cu2L3)(H2O)]2·5H2O}n (9) were synthesized from H5L3. Their structures were characterized by elemental analysis, IR, UV, fluorescence spectroscopy, X-ray diffraction and thermal analysis.(4) Through condensing 3-carboxysalicylidene and triethylenetetramine, a new Schiff base ligand H6L4 [H6L4 = 3,3',3''-(1E,1'E,1''E)-(2,2',2''-nitrilotris(ethane-2,1- diyl)tris(azan-1-yl-1-ylidene))tris(methan-1-yl-1-ylidene)tris(2-hydroxybenzoic acid)] has been synthesized. Taking advantage of the MnCl2·4H2O, a binuclear manganese complex [Mn2(HL4)]·DMF·1.13H2O (10) as been obtained. While the mononuclear complex of nickel has also been obtained, through the self-assembly of mononuclear complex, we have synthesized heterohexanuclear complexes [Ni2Eu(L4)(H2O)2]2.9H2O (11), we studied their spectacular structures and properties.
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