Two novel Co(II) metal–organic frameworks, {[Co2(OH)(cnp-ipa)(EtOH)(H2O)]}n (1) and {[Co3(cnp-ipa)2(bpa)4(H2O)2]}I (2) (Hcnp-H2ipa = 5-(4-carboxy-2-nitrophenoxy)isophthalic acid, bpa = 1,2-bis(4-pyridyl)ethane), have been prepared and characterized. The single crystal X-ray diffractions reveal that both MOFs exhibit 3-nodal networks with new topological prototypes. MOF 1 possesses a (5,6,8)-connected 3D lattice with a new {32.44.54}2{34.44.54.63}{34.48.56.69.8} topology, and MOF 2 manifests a 2D → 3D interpenetrated porous solid featuring a (3,4)-connected layer lattice with a new {5.64.8}2{52.6}2{54.82} topology. The results illustrate the presence of a N-donor co-ligand to identify the assembly of MOFs. The solid-state properties such as the thermal stability and magnetic properties have also been studied.
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