A dinuclear copper (II) macrocyclic pyrazole compound catayses the oxidative polymerisation of 2,6-dimethylphenol

摘要

The single crystal X-ray structure of the compound [DCu_2(EtPy24Pz)(O_3)_2](NO_3)_2(H_2H)_7, with EtPy24Pz is 10,24-di(pyridin-2-ylethyl)-1,5,10,15,19,24,29,30,31,32-decaaza-6,14,20,28-tetramethyl-pentacyclo[24.2.1.1~(5,8).1(12,15).1~(19,22)]dotriaconata -6,8(30),12(31), 13,20,22,(22), 26(29), 27-octaene, shows the copper (II) ions in a square pyramidal N_4O environment, crystalographically related by a twofold axis, at a distance of 7.24 A. EPR data provide evidence that the two copper (II) ions , enclosed in the macrocyclic ligand, can be brought closer together by bridging anions. A similar coo-eration with the binding of dehydronated 2.6-dimethylphenol is considered to take place to incite the two-electron transfer which leads to the production of polyphenylene ether through the intermediate ormation of a phenoxonium cation.