Aggregation behavior of amphiphilic D-pi-A molecules bearing recognition group

Aggregation behavior of two amphiphilic D-pi -A molecules bearing barbituri c acid as both recogniton group and electron-drawing substituent, 5-(4-dode cyl oxybenzylidene)-(1H, 3H)-2,4,6-pyrimidine trione (PB12) and 5-(4-N,N-di dodecyl aminobenzylidene)-(1H,3H)-2,4,6-pyrimidine trione (AB(12)) was stud ied by UV-visible, fluorescence, and surface voltaic spectroscopies (SPS). The experimental results indicate that PB12 tends to form J-aggregate and A B(12) tends to form H-aggregate under increasing concentration. An intramol ecular twisted charge transfer (TICT) emission around 500 nm is observed wh en J-aggregate is formed between PB12 molecules, and an excimer emission ar ound 600 nm is observed when H-aggregate is formed between AB(12) molecules .