989-74-2Relevant articles and documents
Pure organic room-temperature phosphorescent material, preparation method thereof and application thereof
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Paragraph 0084; 0085; 0086; 0090-0092, (2017/08/28)
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
Guha, Samit,Goodson, Flynt S.,Corson, Lucas J.,Saha, Sourav
supporting information; experimental part, p. 13679 - 13691 (2012/10/08)
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.
Comparison of microwave-assisted and conventional preparations of cyclic imides
Upadhyay, Sunil K.,Pingali, Subramanya R.K.,Jursic, Branko S.
experimental part, p. 2215 - 2217 (2010/05/18)
Microwave-assisted preparation of several cyclic imides was performed with four different cyclic anhydrides. All the reactions are significantly faster and the isolated yields are significantly higher compared to conventionally heated reactions. Furthermore, many of these reactions can be performed with a minimal amount of solvent, thereby enabling the synthetic chemist to obtain high quantities of pure cyclic imides in a matter of hours.
