The electrochem. redn. was studied of Cu(II) complexes with 14 membered tetraaza macrocycles with different structural features and different degrees of unsatn. Each complex undergoes a reversible 1-electron redn. at the Hg electrode in MeOH contg. 0.1 M Et4NBF4. The Cu(II)/Cu(I) process in macrocycles systems can be promoted through modification of the ligands that (a) reduce its σ-donor ability by destabilizing Cu(II) and (b) increase its π-acceptor properties by stabilizing Cu(I). Geometrical effects favorable to formation of Cu(I) can be induced in a fixed coplanar array of 4 N atoms by rearranging the system of fused chelate rings.
σ and π Effects on the copper(II)/copper(I) redox couple potential in tetraazamacrocyclic complexes
FABBRIZZI, LUIGI;POGGI, ANTONIO;
1982-01-01
Abstract
The electrochem. redn. was studied of Cu(II) complexes with 14 membered tetraaza macrocycles with different structural features and different degrees of unsatn. Each complex undergoes a reversible 1-electron redn. at the Hg electrode in MeOH contg. 0.1 M Et4NBF4. The Cu(II)/Cu(I) process in macrocycles systems can be promoted through modification of the ligands that (a) reduce its σ-donor ability by destabilizing Cu(II) and (b) increase its π-acceptor properties by stabilizing Cu(I). Geometrical effects favorable to formation of Cu(I) can be induced in a fixed coplanar array of 4 N atoms by rearranging the system of fused chelate rings.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
