A luminescent mesoporous zirconium complex and it as a precursor of environmentally benign catalysts

Synthesis, spectroscopic, biological, and theoretical studies of new complexes from (E)‐3‐(2‐(5, 6‐ diphenyl‐1,2,4‐ triazin‐3‐ yl)hydrazono)butan‐2‐ one oxime

“…High intense emission broad bands were observed at 487 and 509 nm, when excited bands at 312 and 335 nm for the ligand and ZrO complex, respectively. This could be assigned to n–π* and charge transfer transition (O 2− → Zr 4+ ) from the valence band (2p orbits of O) to the conduction band (4d ( x 2 – y 2 , z 2 ) of Zr) . However, in DMF solution the emission bands were observed at 351 and 333 nm when excited bands at 290 and 282 nm for the free ligand and ZrO ( IV) complex, respectively.…”

“…Zr 4+ ) from the valence band (2p orbits of O) to the conduction band (4d (x 2y 2 , z 2 ) of Zr). [72][73][74][75][76] However, in DMF solution the emission bands were observed at 351 and 333 nm when excited bands at 290 and 282 nm for the free ligand and ZrO ( IV) complex, respectively. This finding shows that the Stokes shifts in the solid state (11517 and 10204 cm −1 ) are higher than in DMF solution (5993 and 5431 cm −1 ), as shown in Table 5, which are ≈1.9 times.…”

The Physico-Chemical Characterization of Mesoporous Sulfated Zirconia Nanoparticles Prepared under Structure-Directing-Free for <i>n</i>-Hexane Isomerization

“…Details of the material preparation have been reported elsewhere by the authors [3]. In the present article, the materials were examined via an array of characterization techniques, as mentioned above, for a complete chemical and structural description.…”

“…Compared to the properties of the recently published sulfated zirconia and other types of acid catalysts for n-hexane isomerization, it may be clear from Table 3 that the sulfated zirconia studied shows the best performance among different types of acid catalysts. The mesoporous sulfated zirconia was used for n-hexane isomerization, resulting in a high catalytic activity [3].…”

“…As for supported catalysts, the catalytic activity is greatly dependent on the morphology, porosity, and surface area of the catalyst support. In our work, mesoporous monometallic Pd-promoted sulfated zirconia was used for n-hexane isomerization [3]. Herein, we describe the physico-chemical characterization of the sulfated zirconia catalysts prepared from zirconyl chloride, acetic acid and ammonium persulfate system under structure-directing-free and calcined at 650˚C, showing their high acidity, mesoporous and nanocrystalline structure.…”