title: Synthesis and photoluminescence study of di-dendron dendrimers derived from mono-Boc-protected ethylenediamine cores.
abstract: This work is focused on the synthesis and optical properties of cone-shaped structural feature di-dendron polyamidoamine dendrimers up to the third generation with mono-Boc-protected ethylenediamine (EDA) as a core. Strong UV absorbance spectra and fluorescence spectra from di-dendron dendrimers with different terminal groups (-NH(2), -COOCH(3)) were studied under different conditions by varying experimental parameters such as concentration and pH. The optical density and fluorescence intensities increased when di-dendron dendrimers generation number increased from 0.5 to 3.0. It was confirmed that the concentration of di-dendron dendrimers plays an important role in fluorescence intensity. The increase in fluorescence intensity was linear in low concentration regions, but the intensity increased slowly in high concentration regions. The results also showed a rapid increase in fluorescence intensity at low pH. The formation of a fluorescence-emitting moiety had a close relationship to protonated tertiary amine groups in di-dendron dendrimers derived from mono-Boc-protected EDA cores. Furthermore, the formation of fluorescent chemical species was irreversible.
authors.affiliation: Alan G. MacDiarmid Institute of Jilin University, Changchun, China.
authors.forename: Yili
authors.initials: Y
authors.lastname: Zhao
authors.forename: Sen
authors.initials: S
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Jiang
authors.forename: Yulei
authors.initials: Y
authors.lastname: Chang
authors.forename: Yapeng
authors.initials: Y
authors.lastname: Li
authors.forename: Xuexun
authors.initials: X
authors.lastname: Fang
authors.forename: Jingyuan
authors.initials: J
authors.lastname: Wang
mesh_terms: D000873:Anthracenes / Q000737:chemistry*; D002254:Carbonates / Q000737:chemistry*; D050091:Dendrimers / Q000138:chemical synthesis* / Q000737:chemistry*; D005029:Ethylenediamines / Q000737:chemistry*; D005453:Fluorescence; D006863:Hydrogen-Ion Concentration; D008163:Luminescent Measurements; D015394:Molecular Structure
chemical_list: D000873:Anthracenes; D002254:Carbonates; D050091:Dendrimers; D005029:Ethylenediamines; C501244:dendron; C031234:ethylenediamine