Synthesis, structure and magnetism of new polynuclear transition metal aggregates assembled with Schiff-base ligand and anionic N-donor ligands
作者： Yangguang Li , Qiong Wu , Lollita Lecren , Rodolphe Clérac
DOI: 10.1016/J.MOLSTRUC.2008.05.044
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摘要: Abstract Three new polynuclear aggregates [Co6(sae)4(N3)6(MeO)2(MeOH)2]·0.5H2O (1), [Mn4O(sae)4(C(CN)3)(MeOH)3](NO3)·MeOH (2) and [NaFe6(sae)6(MeO)6] (N(CN)2)·H2O (3) have been synthesized with mixed ligands of Schiff-base (salicylidene-2-ethanolamine, H2sae) various anionic N-donor (N3−, N(CN)2− or C(CN)3−) transition metal salts in methanol solution. Crystallographic data for 1: trigonal, R 3 ¯ , a = 26.113(4) A, b = 26.113(4) A, c = 20.689(4) A, γ = 120°, V = 12,218(3) A3, Z = 9, R1(wR2) = 0.0753(0.2176); 2: orthorhombic, Pna21, a = 20.746(4) A, b = 13.357(3) A, c = 17.992(4) A, V = 4985.6(2) A3, Z = 4, R1(wR2) = 0.0357(0.0969); 3: monoclinic, C2/c, a = 30.311(6) A, b = 12.452(3) A, c = 20.789(4) A, β = 94.75(3)°, V = 7820(3) A3, R1(wR2) = 0.0773(0.2299). Compound 1 exhibits a rod-like [CoIII4CoII2] structural feature. 2 contains an unusual tetranuclear [MnIII4] cationic core. possesses well-known circle-like [FeIII6] unit encapsulated central sodium cation. Magnetic properties these compounds studied revealing the presence (i) intra-molecular antiferromagnetic interactions that induce overall ST = 0 ground state (ii) CoII–CoII ferromagnetic complex 1.
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