A Metalloligand Approach for the Self-Assembly of a Magnetic Two-Dimensional Grid-of-Grids

摘要

The efficient organization of discrete functional molecules into extended frameworks, while retaining their physical properties, is a mandatory requisite to move toward applications. Here we describe the validity of the metalloligand design strategy as a versatile and powerful approach to build up a two-dimensional (2D) magnetic metal-organic framework (MOF) composed of preformed discrete antiferromagnetically coupled [3 x 3] Cu-9(II) incomplete grids. In the first stage, a novel oxamato-based nonanuclear copper(II) complex has been self-assembled from the reaction of a polytopic organic ligand, with well-defined coordination pockets, with Cu-II ions. Then, the nonanuclear complex has been used as metalloligand toward calcium(II) cations to afford a Ca-II-Cu-II 2D MOF (1) with a grid-like topology and the magnetic properties of the preformed nonanuclear grids.