Synthesis and Optoelectronic Properties of 2,2,3,3,5,5,6,6,7,7,8,8-Dodecamethyl-2,3,5,6,7,8-hexasilabicyclo2.2.2octane-l-yl-substituted Pyrans

摘要

When a CH_3CN solution of 4-(2,2,3,3,5,5,6,6,7,7,8,8-dodecamethyl-2,3,5,6,7,8-hexasilabicyclo[2.2.2]octane-l-yl)benzaldehyde and 4-dicyanomethylene-2,6-dimethyl-4H-pyran in excess was heated to reflux,the corresponding 1 :1 adduct produced in 77% yield,while the 2 :1 adduct was obtained in 96% yield by heating a 2-propanol solution of the aldehyde (3 parts) and the pyran (1 part) at 80 °C.Electroluminescent devices with the structure ITO/alpha-NPD (50 nm)/Alq_3:the pyrans (1 mol%,75 nm)/MgAg (200 nm) were fabricated and examined.The polysilacage-substituted pyrans were found to act as an orange luminescent dopant of organic electroluminescent devices.