719261-06-0Relevant articles and documents
NiO nanoparticles prepared via thermal decomposition of the bis(dimethylglyoximato)nickel(II) complex: A novel reusable heterogeneous catalyst for fast and efficient microwave-assisted reduction of nitroarenes with ethanol
Farhadi, Saeid,Kazem, Maryam,Siadatnasab, Firouzeh
, p. 606 - 613 (2011/04/16)
NiO nanoparticles with an average size of 12 nm and a high specific surface area of 88.5 m2/g were easily prepared via the thermal decomposition of the complex Ni(dmgH)2 and were characterized by TGA, XRD, FT-IR, TEM and BET surface area measurement. This nanosized transition metal oxide was used as a new heterogeneous catalyst for the reduction of nitroarenes under microwave irradiation. The efficient and selective reduction of aromatic nitro compounds into their corresponding amines was observed by using ethanol as a hydrogen donor (reducing agent) and KOH as a promoter under microwave irradiation. This highly regio-and chemoselective method is fast, simple, inexpensive, high yielding, clean and compatible with several sensitive functionalities, such as halogens,-OH,-OCH3,-CHO,-COCH 3,-COOH,-COOEt,-CONH2,-CN,-CHCH2 and-NHCOCH3. This method is suitable for the large scale preparation of different substituted anilines as well as other arylamines. In addition, the catalytic activity of nanosized NiO is higher than that of the bulk sample.
OPTICAL, X-RAY K-ABSORPTION AND THERMAL STUDIES ON SOME METAL-CHELATES OF SALICYLHYDRAZIDE
Khadikar, Padmakar V.,Apte, Dhanashri,Amma, Bhagirathi,Ali, Syed M.
, p. 169 - 186 (2007/10/02)
The metal chelates of VO(II), Cu(II), Ni(II), Co(II) and Zn(II) with salicylhydrazide (SH) have been synthesized and characterized by elemental, I.R., Optical, X-ray K-absorption and magnetochemical studies.Thermal behaviour (TG, DTG and DTA) of the chelates has also been investigated and the thermal degradation products have been identified by X-ray K-absorption as well as far-I.R. spectra.The former study indicated change from octahedral to tetrahedral stereochemistry as a consequence of dehydration.The thermal stability of the complexes follows the order: VO(II)>Cu(II)>Co(II)>Ni(II)>Zn(II).This is roughly in the order of the binding strength of water molecules to the metal ion.
Carbonylnickelates. 3. Synthesis and chemical characterization of the [Ni12(CO)21H4-n]n- (n = 2, 3, 4) clusters
Ceriotti, Alessandro,Chini, Paolo,Della Pergola, Roberto,Longoni, Giuliano
, p. 1595 - 1598 (2008/10/08)
The hydrolysis of the [Ni6(CO)12]2- dianion under buffered conditions results in the synthesis of the interstitial hydride derivatives [Ni12(CO)21H2]2- and [Ni12(CO)21H]3-. The two compounds are related by an easily reversible protonation-deprotonation equilibrium. In contrast, deprotonation of [Ni12(CO)21H]3- to the corresponding [Ni12(CO)21]4- tetraanion is possible only under severe conditions. The tetraanion has been obtained as a byproduct of the synthesis of [Ni6(CO)12]2- by reduction of Ni(CO)4 in KOH-saturated methanolic solution. The [Ni12(CO)21H4-n]n- (n = 2, 3, 4) derivatives have been isolated in pure crystalline form with a variety of tetrasubstituted ammonium or phosphonium cations. All these dodecanuclear nickel carbonyl clusters are rapidly degraded by carbon monoxide (25°C, 1 atm) and possess limited thermal stability. Degradation of [Ni12(CO)21H2]2- by carbon monoxide in THF solution affords the binuclear hydride derivative [Ni2(CO)6H]- and Ni(CO)4. Degradation of [Ni12(CO)21H]3-, in addition to the former products, gives rise to [Ni5(CO)12]2-, which becomes the only product, together with Ni(CO)4, when starting from [Ni12(CO)21]4-.
