Syntheses and characterization of a new class of zirconia precursors of oxime-modified zirconium(IV) isopropoxide

Thermosensitive Structural Changes and Adsorption Properties of Zeolitic Imidazolate Framework-8 (ZIF-8)

“…The resulting NMR spectra for all samples showed the representative peaks, comparable to S18, and S20) can be attributed to the vibrational mode of OH in Zn(OH) 2 . 69 The relatively sharp peaks around ∼1640 and ∼910 cm −1 (indicated by blue arrows in Figures 8 and S18) can possibly be ascribed to CN and N−O vibrational modes in CN−OH, respectively, 70,71 due to the oxidized form (oxime) of the mim ligands, while the broad peak around ∼3300 cm −1 could also correspond to the O−H vibrational mode in N−OH. Based on these, we hypothesize that the link between Zn atoms and N atoms in the mim ligands was partially broken to be Zn−OH and N− OH, respectively.…”

Synthesis, spectral characterization and crystal structure of a new precursor [(CH3COCHCOCH3)2Zr{C6H4(N=CHC6H4O)2}] for nano-zirconia: an investigation on the wettability of polyvinylidene fluoride–nano-zirconia composite material

“…[1][2][3][4][5][6][7]. There are various reports on the synthesis of nano-zirconia such as precipitation, hydrothermal synthesis, thermal decomposition and sol-gel technology, but sol-gel method is more advantageous because of its accomplishment with high purity, uniformity and homogeneity at lower sintering temperatures [8]. Being excessively hygroscopic in nature, obtaining nano-crystallites of ZrO 2 from zirconium alkoxides using the well-established sol-gel technology requires considerable attention and care because precipitation dominates over gelation [9].…”

“…Being excessively hygroscopic in nature, obtaining nano-crystallites of ZrO 2 from zirconium alkoxides using the well-established sol-gel technology requires considerable attention and care because precipitation dominates over gelation [9]. Therefore, the moisture sensitivity of zirconium alkoxides could be retarded by substituting hydrolysable alkoxy groups with chelating ligands as modifiers [8,10,11]. Thus, the controlled hydrolysis of modified zirconium derivatives results in fine and uniform nano-sized zirconia via sol-gel synthetic route.…”

“…Hence, it opens the door to the development of novel derivatives of zirconium with considerable stability as well as ease of hydrolysis. Though there are several reports on the synthesis of zirconium dioxide nano-particles from a variety of alkoxide precursors (synthons), e.g., n-propoxide [12][13][14], n-butoxide [15], acetylacetonate [16], and modified alkoxides of zirconium (IV) [8,17], most of the precursors exhibit extreme moisture sensitivity and precipitation during hydrolysis. On the other hand, the irregular shape, lack of uniformity in particle size and agglomeration in the obtained nano-structured zirconia are evident through authentic observations.…”