Synthesis, Structure, and Complexation Properties of Partially and Completely Reducedmeso‐Octamethylporphyrinogens (Calix[4]pyrroles)

Abstract

New tricks for an old dog: Calixpyrroles bind anions efficiently and can be transformed into transition‐metal complexes only under forcing conditions. Reducing the macrocycle creates a ligand that easily forms classical Werner complexes with copper, nickel, and palladium ions. The metal complexes present an array of four directed hydrogen bonds, which specifically bind the counterions (see picture; blue N, white H, green Cl, red Cu, Ni, or Pd).

Synthesis and crystal structure of Ni, Cu complexes of 5-methyl-10,10,15,15,20,20-hexaethylcalix[4]pyrrole mono-Schiff bases

“…Thus, a 16 vast range of functionalized calixpyrroles derivatives equipped 17 with various chromogenic, fluorogenic, or redoxactive units as well 18 as others are successfully developed [5][6][7][8][9][10][11][12][13][14]. On the other hand, 19 calixpyrrole core are widely used as tetraanionic N4-ligands for 20 metal coordination chemistry [15][16][17][18][19][20][21]. A special class of macrocy-21…”