دانلود مقاله با موضوع دارای پایه های تروگر 4-آمینو-1،8-نفتالیمید فلورسنت بخش های کونژوگه 4-آمینو-1،8-نفتالیمید
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موضوع به انگلیسی:Fluorescent 4-amino-1,8-naphthalimide Tröger’s bases possessing
conjugated 4-amino-1,8-naphthalimide moieties and their potential
fullerenes Host-Guest complexes
بخشی از متن:The synthesis and characterisation of two new 1,8‐naphthalimide Tröger’s bases (TBNaps) 1 and 2 is described
from the commercially available 4‐chloro‐1,8‐naphthalic anhydride. These structures possess two additional 4‐
amino‐1,8‐naphthalimide (Naps) units, each of these ‘terminal’ Naps units have either 1‐(2‐aminoethyl)‐
pyrrolidine or 1‐(2‐aminoethyl)‐piperidine moieties, that are conjugated to the TBNaps units via a short propyl
spacer. The ground and the excited state properties of 1 and 2, as well as the bis‐Nap precursor 10, were evaluated
in a range of solvents that varied by polarity and hydrogen bonding ability. The UV–Vis absorption and
the fluorescence emission spectra, demonstrated that all three compounds possess Internal Charge Transfer
(ICT) excited state properties. Both 1 and 2 were designed as potential receptor molecules for the detection
of C60 (buckminsterfullerene) where it was anticipated that C60 could possibly bind within the orthogonal cavity
of the Tröger’s base’s, through additional interactions with the terminal Naps. While the titrations of 1 and
2 with C60 in a chlorobenzene:DMF (86:14) solvent mixture showed only minor changes in the absorption spectra,
significant fluorescence quenching was observed for both 1 and 2. Analysis of the fluorescence data in
terms of a Stern‐Volmer plot, showed that the quenching involves a combination of both static and dynamic
mechanisms.
