Infinite Metal–Carboxylate Nanotube Constructed Metal–Organic Frameworks and Gas Sorption Properties

Abstract

Two isomorphic microporous metal–organic frameworks (MOFs), [Co2L(H2O)2]·4.5H2O (1) and [Ni2L(H2O)2]·3.5H2O (2), were synthesized by the reaction of an aminopolycarboxylate ligand (H4L) with Co and Ni hydroxides under hydrothermal conditions. The exquisite assembly of the carboxylate, imino groups, and metal ions resulted in a 1D special nanotube that could be used as a blueprint for the construction of MOFs. By joining the nanotubes with the V‐shaped –CH2(C6H)(CH3)3CH2– spacer, a 3D framework with 1D triangular channels was formed. The two isostructural frameworks exhibited stability up to 350 °C. Gas sorption studies for N2, H2, CO2, and CH4 confirmed their permanent porosity.

Modulating the MII/Pyrimidine‐4,6‐dicarboxylato System by Metal, Solvent and Temperature Variation

“…[1][2][3][4][5][6][7] The combination of metallic nodes and linkers provides endless possibilities, so the judicious selection of the metal atom and the ligands employed, together with the coordination features of both (coordination numbers and geometries), allows rational design of the resulting compounds and, therefore, their physical and chemical properties can be tuned at will. [8][9][10] Transition-metal ions are often utilised as versatile treatment at higher temperature led to compound 3, which presents a three-dimensional framework in which the pmdc ligand exhibits an unprecedented μ 5 -κ 2 N,O:κ 2 NЈ,OЈ:κOЈ: κOЈЈ:κOЈЈЈ coordination mode. Moreover, thermogravimetric and thermodiffractometric analyses of 1 have also provided access to an alternative route to obtain higher dimensional frameworks with crystal structures that differ from those crystallised in dissolution.…”