Synthesis of Bimetal Fe and Cu Altered TUD-1: A Mesoporous Catalyst for Phenol Hydroxylation Reaction.

Fe and Cu ions incorporated (Si/Cu = 50, Si/Fe = 50 and Si/Cu + Fe = 50) amorphous, wormhole structured mesoporous catalysts (CuTUD-1, FeTUD-1 and FeCuTUD-1) (TUD-1-Technische Universiteit Delft) have been synthesized hydrothermally using low cost, non-surfactant template triethanolamine (TEA). Physicochemical properties of the catalysts were made using X-ray diffraction (XRD), Nitrogen sorption, FT-IR, DRS UV Visible, FT Raman, SEM, TEM and TG-DTG techniques. The results showed that the materials possess mesoporous, foam type morphology, surface area 485-634 m2/g, pore size 4.8-6.8 nm, pore volume 0.67-0.83 cm3/g and metal ions (Cu2+ and Fe3+) coordinative environment. The highly dispersed Cu2+ and Fe3+ active sites are observed in FeCuTUD-1 catalyst. Also, the synthesized catalysts are tested in the oxidation of phenol with hydrogen peroxide (H2O2) oxidant. Further, reaction parameters such as time, temperature, and catalyst were also investigated.

Synthesis of pyrazolylbisindoles over mesoporous Lewis acidic ZrTUD-1: Potential application in selective Cu(2+) colorimetric detection.

A series of pyrazolylbisindole (PBI) derivatives were prepared by simple condensation of indole and pyrazole aldehyde utilizing amorphous mesoporous ZrTUD-1 having predominant Lewis acid sites. The applicability of pyrazolylbisindolyl derivate as a colorimetric chemosensor with high selectivity toward Cu(2+) over other cations were tested. Among heavy and transition metal (HTM) ions in CH3CN solution, the probe only sensed Cu(2+) detectable by naked eye. The sensor exhibited a new absorption band at 488 nm (a red shift of 206 nm from 282 nm) with a large colorimetric response and affinity to Cu(2+) over other cations tested (Al(3+), Pb(2+), Cd(2+), Mg(2+), Mn(2+), Zn(2+), K(+), Fe(2+), Ca(2+), Cu(2+) and Hg(2+)).

A novel pyrazole biscoumarin based chemosensors for the selective detection of Cu(2+) and Zn(2+) ions.

A novel chemosensor based on pyrazole biscoumarin molecule "4-hydroxy-3-((4-hydroxy-2-oxo-2H-chromen-3-yl)(1,3-diphenyl-1H-pyrazol-4-yl)methyl)-2H-chromen-2-one" (PBC) was synthesized by a simple method. The chemosensing properties of PBC towards transition metal ions like Cu(2+) and Zn(2+) by naked eye, UV-Visible and fluorescence spectroscopic methods were described. The PBC solution with Cu(2+) and Zn(2+) ion showed brown and blue colour respectively. The UV-Visible spectra of PBC with Cu(2+) and Zn(2+) ions exposed their corresponding absorption maxima. Further, the Job's plot method confirmed the 1:1 and 2:1 stoichiometry of the complex formation between the PBC with Cu(2+) and Zn(2+) ions respectively. The fluorescence enhancement of PBC on binding with Cu(2+) and Zn(2+) is due to the inhibition of photo induced electron transfer mechanism.