Add time:07/19/2019         Source:sciencedirect.com

Three microporous Zn coordination polymers, [Zn3(OH)2(TCBA)(4,4′-bpy)]·5.5H2O (1), [Zn3(OH)2(TCBA)(4,4′-bpy)1.5]·5H2O (2), and [Zn4(TCBA)2(4,4′-bpy)2(H2O)8]·11H2O (3) (H4TCBA = 3,4,5-tris(carboxymethoxy)benzoic acid, 4,4′-bpy = 4,4′-bipyrdine), have been hydrothermally synthesized and structurally characterized. 1 presents an uncommon 2-nodal (4,10)-connected network with {3·45}2{34·412·510·614·73·82} topology; 2 can be described as a 2-nodal (3,8)-connected tfz-d net with the symbol of {43}2{46·618·84}, both networks are constructed from hexameric [Zn6(µ3-OH)4]8+ clusters. While 3 shows an interesting 4-nodal (3,3,3,4)-connected network with {8·10·12}2{8·102}2{84·10·12} topology. Complexes 1–3 all own 3-D frameworks with 1-D channels, and in 1–3 lattice and/or coordinated water molecules occupy the channels, especially in 3 Zn-bipy chains reside in the channels together with water molecules. Double helical chains can be observed in complex 2; and single helix chains exist in complexes 1 and 3. Furthermore, the thermal stabilities and photophysical properties of complexes 1–3 were also investigated.

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