Two topologically new trinodal cobalt(ii) metal–organic frameworks characterized as a 1D metallic oxide and a 2D → 3D penetrated porous solid

Abstract

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.