Strong ion pair charge transfer interaction of 1,8-naphthalimide–bipyridinium conjugates with basic anions – towards the development of a new type of turn-on fluorescent anion sensors

Abstract

Fluoride, acetate and benzoate anions reduce naphthalimide–viologen dyads into radicals, which is indicated by a strong fluorescence enhancement.

How the Way a Naphthalimide Unit is Implemented Affects the Photophysical and -catalytic Properties of Cu(I) Photosensitizers

“…The UV/vis absorption spectra of CuNIphen, NIphen, and Cuphen show strong features between 250 and 300 nm in acetonitrile solution (Figure 3 and Table 2) originating from ligand centered (LC) π-π* transitions within the phenanthroline ligand, is also in agreement with the literature (Accorsi et al, 2009;Zhang et al, 2016). The low-energy absorption bands of NIphen between 311 and 365 nm are predominantly due to LC transitions inside the naphthalimide unit (Xiao et al, 2010;Szakács et al, 2019;Yarnell et al, 2019). Cuphen has a broad absorption band centered at 380 nm, which is assigned via TD-DFT calculations to d Cu →πp phen metal-to-ligand charge transfer (MLCT) transitions (Supplementary Figure S29 and Supplementary Table S5).…”

An Indicator Displacement Assay (IDA)-based Analytical Method for Heparin Detection: A Comprehensive Experiment in Analytical Chemistry

“…Pyranine是一种低毒、水溶性的有机光酸，在生理pH条件下荷负电，其结构如图1c所示。Pyranine 通常被认为是π电子给体，它在紫外-可见区具有较强的吸收，可以作为光学指示剂 [23] 。1,1-二甲基-4,4'-联吡啶阳离子，又称甲基紫精(MV 2+ )，其结构式如图1b所示，通常被认为是π电子受体 [24][25][26]…”

Research Progress on Naphthalimide Fluorescent Probes

“…However, some anions are toxic and harmful to the human body and environment, so it is necessary to design a highly sensitive anion sensor with a simple synthesis. [ 47∓50 ]…”