It is a trend to construct multicomponent room temperature phosphorescence/RTP doped materials in the future to improve phosphorescence performance by using the advantage that the host in the doped system can be used as a container containing other components. Herein, the multicomponent doped systems are constructed with two isoquinoline derivatives (OxISQ and PrISQ) as the guests, diphenyl sulfoxide/SDB as the host, and alkali (KOH) as the fourth component. Bicomponent doped material OxISQ/SDB has strong cyan RTP, whereas PrISQ/SDB has almost no RTP activity. The effect of KOH on the phosphorescence intensity of OxISQ/SDB is excitation-dependent. When λex = 365 nm, KOH turns off the phosphorescence emission, revealing the intensity of KOH-added three-component doped material OxISQ/SDB/KOH is significantly weaker than that of OxISQ/SDB, whereas KOH exhibits the turn-on property for OxISQ/SDB at λex = 385 nm. For PrISQ/SDB, KOH displays permanent turn-on ability, and PrISQ/SDB/KOH has strong yellow-orange RTP. More deeply, a two-guest four-component doped system OxISQ/PrISQ/SDB/KOH is constructed, and from OxISQ/PrISQ/SDB to OxISQ/PrISQ/SDB/KOH, with the increase of KOH, the phosphorescence colors gradually change from cyan to green to yellow to orange at λex = 365 nm, but the color only can change directly from cyan to yellow-orange at λex = 385 nm. In addition, OxISQ/PrISQ/SDB/KOH exhibited a time-dependent afterglow color from orange-yellow to cyan over 2 s due to the different phosphorescence lifetime, intensity, and wavelength of each component. The experimental results confirmed that phenylhydroxyl-containing guests react with KOH to form organic salts, thereby inducing new excitation and emission wavelengths in the doped materials. This work is the first to construct a four-component doped system with dual guests that can undergo chemical reactions. Moreover, taking advantage of the water solubility of KOH, the doped materials have achieved advanced anticounterfeiting writing and printing in the aqueous phase.

The construction of multicomponent doped systems is an important direction for the development of phosphorescence materials. Herein, benzophenone is selected as the host, phenylquinoline isomers are designed as guests, and seven metal ions are selected as the third component (Al 3+ , Cu +/2+ , Zn 2+ , Ga 3+ , Ag + , Cd 2+ , and In 3+ ) to construct the threecomponent doped system. Ag + and Cd 2+ can considerably increase the emission intensity up to 38 times, and the highest phosphorescence quantum efficiency reaches 70%. Al 3+ , Ga 3+ , and In 3+ can prolong the emission wavelength, and the phosphorescence wavelength can be red-shifted up to 60 nm. Cu 2+ , Ga 3+ , and In 3+ can extend the phosphorescence lifetime by a maximum of 3.6 times. A series of experiments demonstrated that the coordination of metals and guests is the key to improve the phosphorescence properties. This work presents a simple and effective strategy to enhance the phosphorescence properties of doped materials.

(NH4)2S2O8-Promoted cross-coupling of thiols/diselenides and sulfoxides to construct unsymmetrical disulfides/selenosulfides is disclosed. Control experiments demonstrate that (NH4)2S2O8 acts as an acid and an oxidant while both ionic and radical routes...

The palladium-catalyzed Suzuki–Miyaura cross-couplings of nitroarenes and heteroarylboronate esters has been developed. A number of heterobiaryl compounds containing pyridine, pyrimidine, quinoline, furan, thiophene, and pyrazole were prepared using [Pd­(cinnamyl)­Cl]2/2-aryl-5-(2,4,6-triisopropylphenyl)-2,3-imidazolylidene­[1,5-a]­pyridines as the catalysts in good to excellent yields. The synthetic practicality of this approach is demonstrated through the synthesis of druglike molecules.

A series of 1,7/8-substituted isoquinolines are designed and synthesized by the dehydrogenation reactions of 7,8-dihydroisoquinolines in the presence of iodic acid. Interestingly, the dehydrogenation products are found to be closely...