Cinnamal Sensing and Luminescence Color Tuning in a Series of Rare-Earth Metal-Organic Frameworks with Trans-1,4-cyclohexanedicarboxylate

• Published in: Molecules (Basel, Switzerland) Switzerland), 2021-08, Vol.26 (17), p.5145
• Main Authors: Demakov, Pavel A, Vasileva, Alena A, Volynkin, Sergey S, Ryadun, Alexey A, Samsonenko, Denis G, Fedin, Vladimir P, Dybtsev, Danil N
• Format: Article
• Language: English
• Subjects: Cinnamaldehyde; Color; coordination polymers; Crystal structure; Energy; Europium; Ligands; light-emitting devices; Luminescence; Metal-organic frameworks; Nitrates; Rare earth elements; Terbium; X-ray diffraction analysis; Yttrium
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules26175145

Three isostructural metal-organic frameworks ([Ln (phen) (NO ) (chdc) ]·2DMF (Ln = Y for , Eu for or Tb for ; phen = 1,10-phenanthroline; H chdc = -1,4-cyclohexanedicarboxylic acid) were synthesized and characterized. The compounds are based on a binuclear block {M (phen) (NO ) (OOCR) } assembled into a two-dime nsional square-grid network containing tetragonal channels with 26% total solvent-accessible volume. Yttrium ( )-, europium ( )- and terbium ( )-based structures emit in the blue, red and green regions, respectively, representing the basic colors of the standard RGB matrix. A doping of Eu and/or Tb centers into the Y -based phase led to mixed-metal compositions with tunable emission color and high quantum yields (QY) up to 84%. The bright luminescence of a suspension of microcrystalline in DMF (QY = 78%) is effectively quenched by diluted cinnamaldehyde (cinnamal) solutions at millimolar concentrations, suggesting a convenient and analytically viable sensing method for this important chemical.