Details

Autor(en) / Beteiligte

• Andrienko, Irina V
• Rakhmanova, Mariana I
• Samsonenko, Denis G
• Kovalenko, Ekaterina A

Titel

Supramolecular lanthanide assemblies with cucurbit[6]uril: from synthesis and crystal structure to application

Ist Teil von

• CrystEngComm, 2023-06, Vol.25 (23), p.346-3471

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Reactions between Ln(NO 3 ) 3 and cucurbit[6]uril in HNO 3 have been studied, aiming to create novel light-emitting systems. Aquanitrato complexes of lanthanides were obtained as supramolecular assemblies 1-10 with the organic macrocyclic cavitand cucurbit[6]uril. X-ray diffraction study demonstrated that these compounds have the following compositions: [{Ln(H 2 O) 5 (NO 3 )} 2 (C 36 H 36 N 24 O 12 )](NO 3 ) 4 ·HNO 3 · n H 2 O (Ln = Pr( 1 ), Nd( 2 ), Sm( 3 ), Eu( 4 ), Gd( 5 ), Tb( 6 )) and 2[Ln(H 2 O) 8 ](NO 3 ) 3 ·C 36 H 36 N 24 O 12 ·2HNO 3 · m H 2 O (Ln = Dy( 7 ), Ho( 8 ), Er( 9 ), Yb( 10 )). Compounds with different structures were shown to crystallize under the same synthesis conditions for the early and late lanthanides. The compounds were characterized by powder X-ray diffraction, thermogravimetric and elemental analyses, and IR spectroscopy. The magnetic property of compound 5 was also examined. The luminescent properties for compounds 1-10 were studied. The chromaticity coordinates (CIE) for compounds 1-10 were calculated. The color purity of compound 4 was found to be 96%, which is very close to that of the standard red light source. Compound 4 can be considered a potential red-emitting candidate for near-UV WLEDs. The color purity of compound 7 is very close to zero, so it is well suited for generation of white light, which further suggests its utility for W-LED applications. A cool white LED device was fabricated for the first time by combining the supramolecular coordination polymer 7 and a UV LED chip (365 nm) under a voltage of 3.0 V; the CIE, CCT and CP were (0.301, 0.325), 7228 K and 7%, respectively. Reactions between Ln(NO 3 ) 3 and cucurbit[6]uril in HNO 3 have been studied, aiming to create novel light-emitting systems.