Preparation and characterization of 14T2Cu/MCM-41 and 140Cu/MCM-41

MCM-41 materials loaded with cupric complexes of 4, 8-bis(2-thienylmethyl-1 ,4, 8, 11-tetraazacyclotetradecane-12,14-dione(14T2Cu) and 1,4,8, 11-tetraa zacyclotetradecane-12, 14-dione(140Cu) were prepared by mixing the correspo nding complexes respectively with silica form of mesoporous molecular sieve MCM-41. The composite materials were characterized by powder XRD, UV-Vis a nd ESR spectroscopies. The absorption maximum for 14T2Cu/MCM-41 shifts towa rds the higher frequency by 19 nm in comparison with 14T2Cu complex in meth anol solution, whereas the absorption for 140Cu/MCM-41 is close to that for 140Cu in methanol. Both 14T2Cu and 140Cu complexes behave anisotropically within the channel of MCM-41 material on the basis of ESR spectra.