2D/3D coordination polymers based on di-, tri-, tetranuclear and polymeric chain units with a tricarboxylate ligand: Structures, magnetic and luminescent properties

摘要: Abstract Six novel coordination polymers (CPs), [M2(HL)2(4,4′-bipy)(H2O)2] (M = Co, for 1; Ni, 2), [M3(L)2(CH3CN)2(H2O)2]·2H2O 3; 4), [Co4(OH)2(L)2(4,4′-bipy)(H2O)4]·2H2O (5) and [Zn4(OH)2(L)2(DMA)2(H2O)2] (6) have been synthesized by using different metal ions 5-(2-nitro-4-carboxylphenyl)isophthalic acid (H3L) ligand in the absence/presence of 4,4′-bipyridine (4,4′-bipy) ancillary ligand. Interestingly, these CPs exhibit structures based on di-, tri-, tetranuclear chain units, respectively. 1 2 are isomorphous possess a (4,4) 2D layer which dinuclear [M2(µ2-Ocarboxylate)2]2+ clusters interlinked HL 4,4′-bipy ligands. In 3 4, linear trinuclear [M3(μ2-COO)2(μ2-Ocarboxylate)]3+ linked L ligands to give with (3,6)-connected kgd topology. 5, chair-shaped [Co4(μ3-OH)2]6+ organic spacers into (3,8)-connected net point symbol (3·42)2(34·46·56·68·73·8). Compared cluster 5 6 very similar, but 6, [Zn4(μ3-OH)2]6+ connected double (μ2-syn, anti-COO)2 bridges form 1D chain. The chains further cross-linked build 3D framework. Magnetic analyses suggest that all short bridging moieties 1–5 transmit antiferromagnetic couplings between metal(II) ions. Moreover, CP shows an intense solid-state emission at room temperature. This work opens up use this tricarboxylate generating interesting functional properties.