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• 81-30-1 1,4,5,8-naphthalenetetracarboxylic dianhydride 
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Relevant academic research and scientific papers

Pure organic room-temperature phosphorescent material, preparation method thereof and application thereof

The invention provides a pure organic room-temperature phosphorescent material with a structure as shown in formula (I) or formula (II), and also provides a preparation method for the pure organic room-temperature phosphorescent material with the structure as shown in formula (I) or formula (II). The invention discloses a series of pure organic room-temperature phosphorescent materials based on a naphthalimide derivative. The pure organic room-temperature phosphorescent materials are characterized in that pure organic electron-donating groups are introduced into molecules, so that the molecules are excited by an outside light source to generate a charge transfer state (ICT) in the molecules, and ICT can promote intersystem crossing, so that generation of room-temperature phosphorescence is facilitated. The pure organic phosphorescent material provided by the invention has the advantages of being simple and convenient to synthesize, low in cost, easy to chemically modify, low in toxicity, environmentally friendly and the like.

Boundaries of anion/naphthalenediimide interactions: From anion-π interactions to anion-induced charge-transfer and electron-transfer phenomena

The recent emergence of anion-π interactions has added a new dimension to supramolecular chemistry of anions. Yet, after a decade since its inception, actual mechanisms of anion-π interactions remain highly debated. To elicit a complete and accurate understanding of how different anions interact with π-electron-deficient 1,4,5,8-naphthalenediimides (NDIs) under different conditions, we have extensively studied these interactions using powerful experimental techniques. Herein, we demonstrate that, depending on the electron-donating abilities (Lewis basicity) of anions and electron-accepting abilities (π-acidity) of NDIs, modes of anion-NDI interactions vary from extremely weak non-chromogenic anion-π interactions to chromogenic anion-induced charge-transfer (CT) and electron-transfer (ET) phenomena. In aprotic solvents, electron-donating abilities of anions generally follow their Lewis basicity order, whereas π-acidity of NDIs can be fine-tuned by installing different electron-rich and electron-deficient substituents. While strongly Lewis basic anions (OH- and F-) undergo thermal ET with most NDIs, generating NDI?- radical anions and NDI 2- dianions in aprotic solvents, weaker Lewis bases (AcO-, H2PO4-, Cl-, etc.) often require the photoexcitation of moderately π-acidic NDIs to generate the corresponding NDI?- radical anions via photoinduced ET (PET). Poorly Lewis basic I- does not participate in thermal ET or PET with most NDIs (except with strongly π-acidic core-substituted dicyano-NDI) but forms anion/NDI CT or anion-π complexes. We have looked for experimental evidence that could indicate alternative mechanisms, such as a Meisenheimer complex or CH anion hydrogen-bond formation, but none was found to support these possibilities.

Electronically regulated thermally and light-gated electron transfer from anions to naphthalenediimides

Anion-induced electron transfer (ET) to π-electron-deficient naphthalenediimides (NDIs) can be channeled through two distinct pathways by adjusting the Lewis basicity of the anion and the π-acidity of the NDI: (1) When the anion and NDI are a strong elect

Analgesic activity of cyclic imides: 1,8-Naphthalimide and 1,4,5,8- naphthalenediimide derivatives

In early studies, we have reported the synthesis and biological activities of several cyclic imides. The present study describes the analgesic activity of 1,8-naphthalimide and 1,4,5,8-naphthalenediimide derivatives in a standard murine model of analgesia. The pharmacological results show that all compounds studied, given intraperitoneally, produced significant inhibition of acetic acid-induced abdominal constrictions. At the ID50 (μmol/kg) level, these cyclic imide derivatives were about 40-270- fold more potent in this assay than aspirin and acetaminophen, two well-known and widely used analgesics. These results extend previous studies on the analgesic activity of cyclic imides. (C) 2000 Elsevier Science S.A.