Co-crystallization of organic chromophore roseolumiflavin and effect on its optical characteristics. Issue 41 (15th August 2022)

• Record Type: Journal Article
• Authors: Haj Hassani Sohi, Takin; Maass, Felix; Czekelius, Constantin; Suta, Markus; Vasylyeva, Vera
• Is Part Of: CrystEngComm. Volume 24:Issue 41(2022)
• Page Start: 7315
• Page End: 7325
• Publication Date: 2022-08-15
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/d2ce00589a
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Three roseolumiflavin co-crystals are designed to elucidate the accessibility of flavins for the targeted tuning of luminescence in the solid state. Abstract : A structural study on the solid, microcrystalline chromophore roseolumiflavin was carried out. Based on rational design considerations three binary co-crystals were prepared with a primary focus set on utilizing the imide functional group. Therefore, robust supramolecular synthons, including a carboxylic acid–amide dimer, halogen bonding, as well as a hydrogen-bonded three-point binding motif, were successfully incorporated into the multicomponent systems. All the co-crystals showed a blue-shifted fluorescence in the red range compared to the near-infrared-emitting solid roseolumiflavin. Solvatochromic studies finally elucidated that the degree of close packing between the flavin molecules within the crystal structures was decisive for the emission colour. These results render new possibilities to investigate flavins in the aspect of crystal engineering to tune optical properties of organic chromophores in the solid state.