Fluorescent Janus ring siloxanes for detection of Au(III) and l-cysteine

BINOL and triazole-containing Janus rings and 29-8-29-membered tricyclic ladder-type hybridized siloxane: application in the fluorescence sensing of anions

“…The low yield (13%) of 7 was due to the low selectivity and several concomitant side reactions, such as the competitive linear intermolecular reaction. The structure of compound 5 was verified using 1 H, 13 C, and 29 Si NMR and MALDI-TOF mass spectroscopy. The result of 1 Additionally, the 29 Si NMR spectrum (see ESI Fig.…”

“…The structure of compound 5 was verified using 1 H, 13 C, and 29 Si NMR and MALDI-TOF mass spectroscopy. The result of 1 Additionally, the 29 Si NMR spectrum (see ESI Fig. S13 †) demonstrated the all-cis structure of 5, with three single peaks attributed to the T-unit silicon atoms (Si in blue) at −78.79 ppm, silicon atoms of carbosilane (Si in green) at 4.86 ppm, and M-unit silicon atoms (Si in red) at 12.08 ppm, which is in accordance with those found in the previous reports.…”

“…[26][27][28] Very recently, two pyrene-substituted all-cis-T 4 have been proved to be selective sensors for the detection of gold ions and L-cysteine. 29 However, all-cis-T 4 used for sensing anions have not been reported yet. It is well-known that 1,2,3-triazole groups possess the ability to associate with guest anions through both electrostatic force and C-H⋯X type hydrogen bonds.…”

Synthesis and characterization of sulfide/sulfone-containing 18-8-18-membered-ring ladder-type siloxanes

“…23–25 Also, the B(C 6 F 5 ) 3 -catalyzed Piers–Rubinsztajn reaction, a transition metal-free approach to preparing well-controlled branched polysiloxanes, 26–29 has recently become a powerful tool for extending hydrosilyl-substituted all- cis -T 4 with methoxybenzene derivatives. 30–32 All- cis -T 4 with pyrene groups obtained recently by this method were found to be selective sensors for detection of gold ions and l -cysteine. 32…”

Synthesis and Characterization of Cyclotri- and Tetrasiloxanes with Pyrenyl Groups

“…Recently, cyclosiloxanes having fluorescence moieties with appropriate linkers have been widely studied. Cycloteterasiloxane having naphthyl, anthryl, pyrenyl, − and BODIPY, with alkyl and alkenyl linkers have been prepared. However, cyclosiloxanes in which polycyclic aromatic hydrocarbons such as anthracene and pyrene are directly connected to silicon atoms have scarcely been reported.…”