Mixed-metal-organic frameworks (M'MOFs) from 1D to 3D based on the 'organic' connectivity and the inorganic connectivity: syntheses, structures and magnetic properties

摘要

Based on the (IOm)-O-n notion (I-n = the dimensionality of the inorganic connectivity; O-m = the dimensionality of the organic connectivity; n + m <= 3), we obtained ten transition/alkaline earth mixed-metal-organic frameworks (M'MOFs) from 1D to 3D through a "metalloligand" strategy at room temperature. Single-crystal X-ray diffraction analyses indicate that the resulting compounds possess the square plane [M-II(pzdc)(2)](2-) (M = Co, Ni or Cu) "organic" connectivity and the Ae-O-Ae (Ae = Ca, Sr or Ba) inorganic connectivity, which can be classified as (IO0)-O-1 connectivity for complexes 1, 4, 7 and 9, (IO1)-O-1 connectivity for complexes 2, 3, 5, 6 and 8 and (IO2)-O-1 connectivity for complex 10. The [M-II(pzdc)(2)](2-) moieties acting as bis(tetradentate) polycarboxylate ligands show three types of coordination modes, namely mu(4)-(eta(2)-O,O)(2),(eta(1)-O')(2), mu(6)-(eta(2)-O,O)(2),(eta(1)-O')(2),(eta(1)-O')(2) and mu(10)-(eta(2)-O,O)(2),(eta(2)-O',O')(2), (eta(1)-O')(2),(eta(1)-O')(2),(eta(1)-N')(2). Additionally, the thermal stabilities of complexes 1-10 and magnetic properties of complexes 1, 2, 4, 5 and 10 have also been investigated.