Abstract :
Triazine based imine and β-ketoenamine linked COFs, TAT- DHBD (1) and TAT-TFP (2)
have been synthesized from 1,3,5-tris-(4-aminophenyl)triazine (TAT) and 2,5-
dihydroxybenzene-1,4-dicarboxaldehyde (DHBD) or 1,3,5-triformylphloroglucinol (TFP)
under solvothermal conditions in dioxane/mesitylene mixture. These COFs exhibit significant
surface area due to their meso- and micropores. The presence of basic nitrogen sites offers
excellent affinity towards Pd nanoparticles and carbon dioxide. Post treatment of COFs 1 and
2 with palladium acetate gives Pd(II)/TAT-DHBD (3) and Pd(II)/TAT-TFP (4), which on
reduction by NaBH4 yields Pd(0)/TAT-DHBD (5) and Pd(0)/TAT-TFP (6), respectively. The
new COFs have been characterized by FT-IR, solid-state 13C-NMR spectroscopy, XPS, SEM,
TEM and BET surface area measurements. TEM studies corroborated uniform distribution of
Pd(II) and Pd(0) sites in the COFs. 3-6 are active towards the Suzuki-Miyaura cross coupling
of arenes with meager catalyst leaching even after five cycles. Besides, 4 exhibits CO2 uptake
of 11 wt % and 7.5 wt% at 273 and 298 K, respectively, at 1 bar.
Author/Authors :
Kaleeswaran, Dhananjayan , Antony, Rajendran , Sharma, Abhishek , Malani, Ateeque , Murugavel, Ramaswamy
