NDLI: Synthesis and fluorescence emission of neutral and anionic di- and tetra-carboranyl compounds

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Ferrer-ugalde, Albert Viñas, Clara Teixidor, Francesc Xochitiotzi, Elba Abreu, Arturo Farfán, Norberto Lerouge, Frédéric Sillanpää, Reijo Núñez, Rosario Santillan, Rosa
Description	Author Affiliation: Lerouge F ( Institut de Ciencia de Materiales de Barcelona (ICMAB-CSIC), Campus de la UAB, 08193, Bellaterra (Barcelona), Spain.)
Abstract	A new family of photoluminescent neutral and anionic di-carboranyl and tetra-carboranyl derivatives have been synthesized and characterized. The reaction of α,α′-bis(3,5-bis(bromomethyl)phenoxy-m-xylene with 4 equiv. of the monolithium salt of $1-Ph-1,2-C_{2}B_{10}H_{11}$ or $1-Me-1,2-C_{2}B_{10}H_{11}$ gives the neutral tetracarboranyl-functionalized aryl ether derivatives closo-1 and closo-2, respectively. The addition of the monolithium salt of $1-Ph-1,2-closo-C_{2}B_{10}H_{11}$ to α,α,′-dibromo-m-xylene or 2,6-dibromomethyl-pyridine gives the corresponding di-carboranyl derivatives closo-3 and closo-4. These compounds, which contain four or two closoclusters, were degraded using the classical method, KOH in EtOH , affording the corresponding nido species, which were isolated as potassium or tetramethylammonium salts. All the compounds were characterized by IR , $^{1}H,$ $^{11}B$ and $^{13}C$ NMR spectroscopy , and the crystal structure of closo-3 was analysed by X-ray diffraction . The carboranyl fragments are bonded through $CH_{2}$ units to different organic moieties, and their influence on the photoluminescent properties of the final molecules has been studied. All the closo- and nido-carborane derivatives exhibit a blue emission under ultraviolet excitation at room temperature in different solvents . The fluorescence properties of these closo and nido-derivatives depend on the substituent (Ph or Me) bonded to the $C_{cluster},$ the solvent polarity, and the organic unit bearing the carborane clusters ( benzene or pyridine ). In the case of nido-derivatives, an important effect of the cation is also observed.
ISSN	14779226
Issue Number	29
Volume Number	40
e-ISSN	13645447
Journal	Dalton Trans.
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2011-08-07
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Boron Compounds Chemical Synthesis Luminescent Agents Chemistry Crystallography, X-Ray Magnetic Resonance Spectroscopy Models, Molecular Spectrometry, Fluorescence Journal Article Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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