FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2017777458> ?p ?o ?g. }

• W2017777458 endingPage "8645" @default.
• W2017777458 startingPage "8625" @default.
• W2017777458 abstract "Abstract A series of six 2,3‐diphenyl‐4‐neopentyl‐1‐silacyclobut‐2‐enes with different 1,1‐substituents has been prepared and characterized by single‐crystal X‐ray crystallography. These compounds possess a cis ‐stilbene‐like chromophore involving also the four‐membered ring, and exhibit a photophysical behavior similar to that of previously reported 1,2‐diphenyl‐cycloalkenes. This chromophore system is confirmed by a theoretical investigation of the electronic structure and excitation spectra. The absorption and photoluminescence of selected derivatives were studied in solution, as solid powder samples, and in doped‐polymer thin films. In well‐dissolved solution, the silacyclobutenes show only very weak fluorescence emission (quantum yield ∼0.1 %), due to competition with photochemical and non‐radiative photophysical relaxation. When the solubility is degraded in a poor (aqueous) solvent, the formation of nanoscale aggregates leads to a significant enhancement factor in the emission intensity, due to the suppression of the photoreactivity in the more rigid molecular environment, although the quantum yield still remains below a few percent. In the solid‐state, however, photoreactivity is completely suppressed leading to fluorescence quantum efficiencies of 8–23 % depending on the 1,1‐substituents, which demonstrates these compounds’ potential as chromophores for condensed‐phase luminescence applications. Two dominant competing photochemical reactions have been identified in solution (for excitation in the lowest‐energy absorption band, >260 nm), which are analogous to related (sila‐)cyclobutenes and stilbenoids. The first involves ring‐opening due to cleavage of the 1,4‐SiC bond to form metastable silabutadienes, which was confirmed by isolating the stereospecifically formed allylsilane which results from a secondary reaction with trapping agents such as methanol or water. The second photochemical reaction involves ring closure of the 2,3‐diphenyl substructure to form a dihydrophenanthrene analogue, which was confirmed by isolating the phenanthrene derivative that results following subsequent hydrogen abstraction in the presence of oxygen. Measurements of the silacyclobutenes in doped‐polymer thin films reveal a spectroscopic behavior ranging from that in solution to the nano‐aggregate case as the silacyclobutene dopant concentration is increased." @default.
• W2017777458 created "2016-06-24" @default.
• W2017777458 creator A5023705098 @default.
• W2017777458 creator A5029142864 @default.
• W2017777458 creator A5031327987 @default.
• W2017777458 creator A5054144090 @default.
• W2017777458 creator A5054826618 @default.
• W2017777458 creator A5056524825 @default.
• W2017777458 creator A5066629896 @default.
• W2017777458 creator A5075787534 @default.
• W2017777458 creator A5081541914 @default.
• W2017777458 date "2009-08-19" @default.
• W2017777458 modified "2023-10-17" @default.
• W2017777458 title "Synthesis, Structure, Photoluminescence and Photoreactivity of 2,3‐Diphenyl‐4‐neopentyl‐1‐silacyclobut‐2‐enes" @default.
• W2017777458 cites W1504277857 @default.
• W2017777458 cites W1509528140 @default.
• W2017777458 cites W1963500439 @default.
• W2017777458 cites W1963683620 @default.
• W2017777458 cites W1964603841 @default.
• W2017777458 cites W1967884090 @default.
• W2017777458 cites W1970764901 @default.
• W2017777458 cites W1971275758 @default.
• W2017777458 cites W1972322109 @default.
• W2017777458 cites W1973580627 @default.
• W2017777458 cites W1975708211 @default.
• W2017777458 cites W1980209606 @default.
• W2017777458 cites W1980778810 @default.
• W2017777458 cites W1981368803 @default.
• W2017777458 cites W1981754932 @default.
• W2017777458 cites W1983567206 @default.
• W2017777458 cites W1987078096 @default.
• W2017777458 cites W1988148175 @default.
• W2017777458 cites W1989553976 @default.
• W2017777458 cites W1993718493 @default.
• W2017777458 cites W1996608920 @default.
• W2017777458 cites W1997151511 @default.
• W2017777458 cites W1997846736 @default.
• W2017777458 cites W2000195111 @default.
• W2017777458 cites W2004962596 @default.
• W2017777458 cites W2007757795 @default.
• W2017777458 cites W2014568884 @default.
• W2017777458 cites W2018648073 @default.
• W2017777458 cites W2019384506 @default.
• W2017777458 cites W2020618614 @default.
• W2017777458 cites W2023271753 @default.
• W2017777458 cites W2023390323 @default.
• W2017777458 cites W2024935454 @default.
• W2017777458 cites W2027825913 @default.
• W2017777458 cites W2028542179 @default.
• W2017777458 cites W2028751304 @default.
• W2017777458 cites W2031012017 @default.
• W2017777458 cites W2031939965 @default.
• W2017777458 cites W2032175154 @default.
• W2017777458 cites W2032185182 @default.
• W2017777458 cites W2034078366 @default.
• W2017777458 cites W2035240782 @default.
• W2017777458 cites W2035298245 @default.
• W2017777458 cites W2036524141 @default.
• W2017777458 cites W2038146233 @default.
• W2017777458 cites W2038533471 @default.
• W2017777458 cites W2044620260 @default.
• W2017777458 cites W2045421387 @default.
• W2017777458 cites W2047806935 @default.
• W2017777458 cites W2049996223 @default.
• W2017777458 cites W2052035789 @default.
• W2017777458 cites W2052063284 @default.
• W2017777458 cites W2054180946 @default.
• W2017777458 cites W2054704030 @default.
• W2017777458 cites W2055459945 @default.
• W2017777458 cites W2058210956 @default.
• W2017777458 cites W2060862006 @default.
• W2017777458 cites W2060958823 @default.
• W2017777458 cites W2061352573 @default.
• W2017777458 cites W2066844402 @default.
• W2017777458 cites W2069629789 @default.
• W2017777458 cites W2071367445 @default.
• W2017777458 cites W2071376734 @default.
• W2017777458 cites W2076940601 @default.
• W2017777458 cites W2077188122 @default.
• W2017777458 cites W2080814542 @default.
• W2017777458 cites W2082071958 @default.
• W2017777458 cites W2083930778 @default.
• W2017777458 cites W2086957099 @default.
• W2017777458 cites W2090812921 @default.
• W2017777458 cites W2094854786 @default.
• W2017777458 cites W2094989517 @default.
• W2017777458 cites W2096048264 @default.
• W2017777458 cites W2126248534 @default.
• W2017777458 cites W2143981217 @default.
• W2017777458 cites W2148066840 @default.
• W2017777458 cites W2148284063 @default.
• W2017777458 cites W2164318957 @default.
• W2017777458 cites W2171559455 @default.
• W2017777458 cites W2315732711 @default.
• W2017777458 cites W2320642704 @default.
• W2017777458 cites W2332099772 @default.
• W2017777458 cites W2335748497 @default.
• W2017777458 cites W2619609791 @default.

• next