ZnO Nanoparticles From a Metal‐Organic Framework Containing Zn^II Metallacycles

Abstract

Nitrilotriacetic acid (H3NTA) reacts in the solid phase with zinc hydroxide (1:1) to form a 3D ladder‐like metal‐organic framework that forms wurtzite ZnO nanoparticles when heated above 600 °C. Complex 1 contains a 1D zig‐zag water chain. A mixed coordination network 2 is formed with excess ZnII hydroxide, which, on decomposition at about 500 °C, forms microwires of ZnO.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)

Catalytic amide formation from non-activated carboxylic acids and amines

“…For instance, the sulfated tungstate catalyst developed by Akamanchi and co-workers and 10 the nano-sulfated TiO 2 catalyst prepared by the group of Hosseini-Sarvari, have proved to be efficient for both Nformylation as well as for N-acylation of other carboxylic acids. 117,118,123,124 The fields of homogeneous and heterogeneous metal-based catalysis for direct amidation remain underdeveloped 15 areas and future improvements is likely to be seen.…”

Decatungstodivanadogermanic heteropoly acid (H6GeW10V2O40.22H2O): A novel, green and reusable catalyst for efficient acetylation of alcohols and phenols under solvent-free conditions

“…The unsaturated alcohol such as cinnamyl alcohol was selectively converted to the corresponding acetate and the carbon-carbon double bond remained intact under the reaction conditions (Table 2, entry 19). Aliphatic and nonbenzylic alcohols were also converted into the corresponding acetate compounds with high efficiency under the same reaction conditions (Table 2, entries [20][21][22][23][24][25]. It is noteworthy that sterically hindered tertiary alcohols, such as triphenylmethanol, also can be acetylated with high yield but it takes a longer reaction time (Table 2, entry 26).…”

“…Heterogeneous catalysts offer several advantages over homogeneous systems with respect to easy recovery and recycling of catalysts as well as the minimization of undesired toxic wastes. In this framework, several metal oxides and supported systems including YO2-ZrO2 [22], ZnO [23], transition metal oxides [24], montmorillonites [25], HClO4-SiO2 [26], H2SO4-SiO2 [27], AlPW12O40 [28], zeolites [29], Nafion-H [30], HBF4-SiO2 [31], KF-Al2O3 [32], MoO3-Al2O3 [33], NaHSO4-SiO2 [34], sulphated zirconia [35] and (NH4)2.5H0.5PW12O40 [36] [TMBSA][HSO4] ionic liquid [37], silica-bonded cobalt(II) salen [38], and silica-bonded N-propyl sulfamic acid and S-propyl sulfuric acid [39,40] have been used as heterogeneous catalysts for the acetylation of alcohols and phenols. However, each of these methods has advantages and limitations.…”

Three-Dimensional Structure of Barium–Cupric Nitrilotriacetate and One-Dimensional Structure of Cobalt–Cupric Nitrilotriacetate: Template Effect of Cations on the Formation of Coordination Polymers

“…Indeed, many materials obtained by self-assembly synthesis strategies exhibit novel structural topologies and/or suitable optical and/or magnetic properties [1][2][3][4][5][6][7][8]. Nitrilotriacetic acid (H 3 nta) is used as a complexing agent to form coordination polymers [9][10][11][12][13]. Many studies reported that protonated and deprotonated nitrilotriacetates afforded various Cu complexes, and the nitrilotriacetato ligand behaved as a tridentate or tetradentate chelate that binds through the amino N and carboxyl O atoms [14-19].…”