Spectroscopic and Reactivity Studies of a Copper‐Containing Metallacrown

Abstract

Cu and Cu 3 Mg‐containing complexes form when the metallacrown 1 is treated with lead or magnesium nitrate, respectively. In the first reaction the sodium ion in the cavity formed by the six copper atoms of the macrocyclic host is replaced by a copper ion, which suggests the destruction of the structure of the macrocycle. In the replacement of the sodium ion by a magnesium ion in the second reaction the macrocycle is cut in half. According to the NMR spectrum of the metallacycle 1 , its structure in the solid state is retained in solution. MeLH = 2‐hydroxy‐6‐methylpyridine. equation image