摘要:
New bis(macrocyclic) dicopper(II) complexes containing phenylene bridges between 16-membered pentaaza macrocyclic subunits have been synthesized via one-pot template condensation of nitrogen-nitrogen linker (1,4-phenylenediamine benzidine; 4.4'-diaminodiphenylmethan; 4,4'-diaminodiphenylether, 4,4'-diaminodiphenyisulfon), formaldehyde. 1,3-diaminopropane. copper(II) and 2,4-pentanedione in a 1:4:4:2:2 molar ratio results in the formation of new series of binuclear copper(II) complexes,. "dichloro[1-phenyl- (1); 1,1'-phenyl- (2); 1,1'-diphenylmethan- (3); 1,1'-diphenylether- (4): IX-diphertylsulfon- (5)l I)is(9,10-dimethyl-1,3,7,11,15-pentaazacyclohexadeca-7,11-diene)copper(II), {[Cu(Me-2[16]aneN(5))](2)RCl4}. {[Cu(Me-2[16]aneN(5))](2)R}(ClO3)(4) (6-10) was prepared by a method similar to that for {[Cu(Me-2[16]aneN(5))](2)RCl4} (1-5) except that copper0l) perchlorate was used instead of copper(H) chlotide. Elemental analyses, IR, UV-vis spectroscopy, conductometric and magnetic measurements have been used to characterize the new bis(macrocyclic) binuclear copper(II) complexes. The spectra of {[Cu(Me-2[16]aneN(5))](2)R}(+4) shows that the four nitrogen atoms are coordinated to the copper(II) ion. These bis(macrocyclic) complexes catalyzed efficiently the selective oxidation of tetrahydrofuran into tetrahydrofuran-2-one and a small amount of tetrahydrofuran-2-ol and 4-hydroxylbutyraldehyde using diluted H2O2 as the oxidant. The influence of solvent, time and concentration of catalyst has been studied. 1.1'-Diphenylsulfonbis(8,10-dimethyl-1,3,7,11,15-pentaazacyclohexadeca-7,1 11-diene)copper(II) perchlorate (10) shows significantly higher catalytic activity vthan other bis(macrocycle) binuclear copper(H) complexes. (c) 2005 Elsevier B.V. All rights reserved.