Cinnamoyl shell-modified poly(amidoamine) dendrimers

✍ Scribed by Jinfeng Wang; Xinru Jia; Hong Zhong; Huizhong Wu; Youyong Li; Xiaojie Xu; Mingqian Li; Yen Wei

• Book ID: 101348494
• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 189 KB
• Volume: 38
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/1099-0518(20001115)38:22<4147::aid-pola150>3.0.co;2-y

✦ Synopsis

Poly(amidoamine)(PAMAM) dendrimers with a cinnamoyl shell were prepared by reacting full generation PAMAM dendrimers (Gϭ3.0) with 2-chloroethanol and cinnamoyl chloride, which resulted in densely packed polymerizable unsaturated groups on the periphery. The cinnamoyl shell of the dendrimers dimerized when irradiated under a UV light by using 5-nitroacenaphthylene as an initiator in dilute dimethylformamide (DMF). FTIR, 1 H NMR, UV-Vis, SEC, and a viscosity test certified that the photocycloaddition of the cinnamoyl shell of the dendrimers took place within the molecules with the disappearance of double bond signals in the FTIR. 1 H NMR spectra as well as the intrinsic viscosity and polydispersity value of the products both before and after irradiation showed no difference. It was further found that the cinnamoyl shell-modified dendrimers possessed fluorescence property, and the fluorescence intensity became stronger when the shell was photocyclized under UVirradiation.