Controlled polarized luminescence of smectic lanthanide complexes

Стратегия создания фотостабильных люминесцентных материалов молекулярной фотоники на основе beta-дикетонатных комплексов лантаноидов (III)-=SUP=-*-=/SUP=-

“…1). Порошки комплексов с такой структурой не подвержены кристаллизации, обладают высокой термостабильностью и низкими температурами размягчения [25][26][27][28][29][30][31]. Данные свойства позволят создавать из расплавов порошков этих соединений застеклованные пленки [29,30,[34][35][36][37][38].…”

“…Нами предложен альтернативный подход к решению вышеуказанных проблем, основанный на синтезе мезогенных β-дикетонатных комплексов лантаноидов(III) [25][26][27][28][29][30][31]. Принципиальное отличие данных соединений от известных модификаций комплексов лантаноидов(III) с β-дикетонатными лигандами заключается в молекулярной структуре, содержащей помимо традиционно используемых ароматических колец циклогексановые кольца и длинные углеводородные цепочки.…”

Wide‐Range Columnar and Lamellar Photoluminescent Liquid‐Crystalline Lanthanide Complexes with Mesogenic 4‐Pyridone Derivatives

“…The new monodentate ligands having three alkoxyl chains with variable number of carbon atoms were prepared through the reaction of 4-hydroxypyridine with 3,4,5-tris(alkyloxy)benzyl bromide derivatives in THF in the presence of NaOH and tetrabutylammonium bromide (TBABr)a sp hase-transfer catalystt o give 4-pyridone derivatives PyO-n as the main product in 65-70 %y ield (Scheme 1). [46,47] All N-alkylated 4-pyridone derivatives were fully characterized by 1 Ha nd 13 CNMR and IR spectroscopya sw ell as by elemental analysis.…”

“…[4][5][6][7][8] In the search for highly emissive metallomesogens, lanthanide-containing liquid crystals (lanthanidomesogens) playacentral role, and they are regarded as ap romising class of light-emitting liquid crystalsw ith excellent emissionproperties, such as narrow emission lines of high color purity,t he option of tuning the emission colorb yc hanging the lanthanide ion, and the possibility to create luminescent materials with polarized emission in the liquid-crystalline (LC) state. [9][10][11][12][13][14][15][16][17][18][19][20][21][22] Due to their wide-rang-ing applications, from telecommunications to life sciences, development of novell anthanide-based mesogensi sm uch needed both for fundamentalr esearch and for applications. [23][24][25][26] Amongt he f-blockm etals, Eu III and Tb III complexes were found to be the strongest emitters( red and green, respectively), whereas Sm III compoundsh aveb een lesss tudied due to their lower luminescence intensity in comparison to Eu III andT b III compounds.…”

“…We report on the synthesis of some new N-[3,4,5-tris(alkyloxy)benzyl]-4-pyridonel igandsa nd their thermotropic lanthanidomesogens containing Eu III ,S m III ,a nd Tb III ions. In this case, the organic ligand has three long flexible alkyl chains with variable number of carbon atoms (6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16) attached to the 4-pyridone coordinatingu nit. Moreover,t hese complexes have mesomorphic properties and exhibit al amellar or hexagonal columnar mesophase, depending on the alkyl chain length,o ver al arge temperature range, in somec ases more than 200 8C, as shown by differentials canning calorimetry (DSC).…”