A Series of Ultra-Efficient Blue Borane Fluorophores
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F20%3A00535530" target="_blank" >RIV/61388980:_____/20:00535530 - isvavai.cz</a>
Result on the web
<a href="https://pubs.acs.org/doi/10.1021/acs.inorgchem.0c02277" target="_blank" >https://pubs.acs.org/doi/10.1021/acs.inorgchem.0c02277</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.inorgchem.0c02277" target="_blank" >10.1021/acs.inorgchem.0c02277</a>
Alternative languages
Result language
angličtina
Original language name
A Series of Ultra-Efficient Blue Borane Fluorophores
Original language description
We present the first examples of alkylated derivatives of the macropolyhedral boron hydride, anti-B18H22, which is the gain medium in the first borane laser. This new series of ten highly stable and colorless organic-inorganic hybrid clusters are capable of the conversion of UVA irradiation to blue light with fluorescence quantum yields of unity. This study gives a comprehensive description of their synthesis, isolation, and structural characterization together with a delineation of their photophysical properties using a combined theoretical and experimental approach. Treatment of anti-B18H22 1 with RI (where R = Me or Et) in the presence of AlCl3 gives a series of alkylated derivatives, Rx-anti-B18H22-x (where x = 2 to 6), compounds 2-6, in which the 18-vertex octadecaborane cluster architectures are preserved and yet undergo a linear ‚polyhedral swelling‘, depending on the number of cluster alkyl substituents. The use of dichloromethane solvent in the synthetic procedure leads to dichlorination of the borane cluster and increased alkylation to give Me11-anti-B18H9Cl2 11, Me12-anti-B18H8Cl2 12, and Me13-anti-B18H7Cl2 13. All new alkyl derivatives are highly stable, extremely efficient (φF = 0.76-1.0) blue fluorophores (λems = 423-427 nm) and are soluble in a wide range of organic solvents and also a polystyrene matrix. The Et4-anti-B18H18 derivative 4b crystallizes from pentane solution in two phases with consequent multiabsorption and multiemission photophysical properties. An ultrafast transient UV-vis absorption spectroscopic study of compounds 4a and 4b reveals that an efficient excited-state absorption at the emission wavelength inhibits the laser performance of these otherwise remarkable luminescent molecules. All these new compounds add to the growing portfolio of octadecaborane-based luminescent species, and in an effort to broaden the perspective on their highly emissive photophysical properties, we highlight emerging patterns that successive substitutions have on the molecular size of the 18-vertex borane cluster structure and the distribution of the electron density within.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10402 - Inorganic and nuclear chemistry
Result continuities
Project
<a href="/en/project/GA18-20286S" target="_blank" >GA18-20286S: Boron Hydride Cluster Lasers: Understanding the Chemical and Structural Factors that Determine the Photophysics of anti-B18H22 and its Derivatives</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Inorganic Chemistry
ISSN
0020-1669
e-ISSN
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Volume of the periodical
59
Issue of the periodical within the volume
23
Country of publishing house
US - UNITED STATES
Number of pages
13
Pages from-to
17058-17070
UT code for WoS article
000599190300034
EID of the result in the Scopus database
2-s2.0-85096563241