Cation Exchange Induced Tunable Properties of a Nanoporous Octanuclear Cu(II) Wheel with Double-Helical Structure

Abstract

A double-helical octanuclear Cu(II) wheel 1 with 2.88 nm diameter was prepared through the reaction of a clinical medicine, telmisartan, with copper sulfate. Central copper ions can be partially replaced by bivalent zinc and cobalt ions and fully exchanged by trivalent iron ions. The properties of central metal ion-exchanged variants are much different from those of 1. Central metal ion exchange might be regarded as a powerful and effective method to modify properties from one crystalline material to another only by varying central metal ions under moderate conditions.

A microporous lanthanide metal-organic framework containing channels: Synthesis, structure, gas adsorption and magnetic properties

“…Over last two decades, metal-organic frameworks (MOFs) with pores and/or channels have attracted great attention in the field of supramolecular chemistry, because of not only their intriguing topological structures, but also their interesting properties for potential applications, such as magnetism, catalysis activity, gas storage, ion exchange, optical properties [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. To obtain MOFs with object properties, structural design or modification of MOFs has become a very active field in crystal engineering [15,16].…”

Tunable structures aroused by cation exchange reaction of solvent-mediated mechanism

“…Our previous investigations [21][22][23][24][25] indicate that the ion exchange reaction mechanism can be classified into two kinds. One is solid-state diffusion mechanism [26,27] with a nonhomogeneous phase exchange process.…”

Crystalline central-metal transformation in metal-organic frameworks

“…However, in an early study by our group [117], Cu II ions in the double-helical octanuclear Cu II wheel complex [Cu 8 L 16 ] (29; HL = 4 -[4-methyl-6-(1-methyl-1H-benzimidazolyl-2-group)-2-n-propyl-1H-benzimidazolyl methyl]) were partially replaced by Zn II and Co II ions. Full exchange with Fe III ions was also observed because of the strong Fe O chemical bond.…”