Platinum acetylacetonate

In 2000, Sun and co-workers succeeded in synthesis of monodispersed Fe/Pt nanoparticles by the reduction of platinum acetylacetonate and decomposition of Fe(CO)5 in the presence of oleic acid and oleylamine stabilizers [18]. The Fe/Pt nanoparticle composition is readily controlled, and the size is tunable from 3 to 10 nm in diameter with a standard deviation of less than 5%. For practical use, we developed the novel symthetic method of FePt nanoparticles by the polyol reduction of platinum acetylacetonate (Pt(acac)2) and iron acetylacetonate (Fe(acac)3) in the presence of oleic acid and oleylamine stabilizers in di- -octylether [19,20]. The Fe contents in FePt nanoparticles can be tuned from 23 to 67atomic%, and the particle sizes are not significantly affected by the compositions, retaining to be 3.1 nm with a very narrow size distribution, as shown in Figure 6. 

As already stated, benzonitrile is a very useful solvent for the insertion of platinum with PtCl2 (Eq. 8). Since the Pt atom in platinum acetylacetonate is bonded to carbon, it was not used for the insertion of this metal. 

CoPt3 nanoparticles earn interest as representatives of alloy-hke species. Furthermore, they are less sensitive towards oxygen and so are somewhat easier to be prepared and to be handled. They become available by simultaneous reduction of platinum acetylacetonate and thermal decomposition of Co2(CO)g. As stabilizing agents, adamantanecarboxyhc acid and hexadecylamine (HAD) are used. Practically, the hot injection technique is applied. The recipient vessel contains the platinum salt, dissolved in 1,2-hexadecanediol, and the stabilizers, whereas Co2(CO)g in 1,2-dichlorobenzene is injected into the hot stock solution. In order to obtain well crystallized nanoparticles, annealing of the reaction mixture at 275 285 °C for about an hour is necessary. The crystalhnity can be checked by TEM andXRD. Figure 7 shows... 

Iron-platinum alloy nanoparticles are very promising candidates for future data storage systems. They become available by simultaneous reduction of platinum acetylacetonate and the decomposition of Fe(CO)5 in oleic acid and oleyl amine.The composition of FexPti x can be varied between X = 0.48 and x = 0.7. The particles exhibit disordered fee structure. They are superparamagnetic at room temperature. Aimealing at 550-600 °C transforms the fee structure into a face-centered tetragonal (fet) one. These have been shown to be suited for storage devices owing to their room temperature coercivity. The exact transition temperature depends on the stoichiometry. 

Platinum catalysts deposited on the supports modified with transition metal oxide monolayers exhibited high activity and satisfactory selectivity in the hydrogenation of unsaturated aldehydes to the corresponding unsaturated alcohols. Platinum acetylacetonate was a more suitable catalyst precursor than hexachloroplatinic acid in the preparation of the transition metal-O-Pt catalytic system for the hydrogenation of cinnamaldehyde and... 

Meille et al. [127] described in detail a hybrid sol-gel/suspension method for coating silicon structures with alumina. Because the channel sizes were very small, the deposited layers were not to exceed 1 pm in thickness. Therefore, the authors used suspensions with particle sizes in the nanometer range and low concentrations (between 0.5 and 5 wt%). An acidic suspension of boehmite was prepared. The boehmite dissolves partially and forms Al-O-Al polymers, which help to anchor the particles to the surface. The resultant layers were subsequently characterized and impregnated with platinum acetylacetonate. 

Forrest and Thompson have demonstrated high-efficiency, high-brightness red phosphorescent OLEDs employing cyclometalated benzothienylpyri-dine (btp) iridium and platinum complexes [43], such as in (2-(2 -benzo[4,5-a]thienyl)pyridinato-N,C3 )platinum(acetylacetonate), [Pt(btp)(acac)] 41. 

As for the hydrido compounds, the nmr spectra of alkyl complexes have been studied in detail.35 It may be noted that platinum acetylacetonate complexes often have Pt—C bonds to the "/-carbon atom rather than the usual metal—oxygen bonding, and the acetylacetonate is thus unidentate as in PtCl(acac) (diphos).36... 

The Y-AI2O3 support (001-1.5E, Akzo Nobel) was crushed and sieved to a particle size of 0.15-0.3 mm. The support was calcined in a muffle furnace in ambient air for 16 h at 400 (for Ir samples) or 600 °C (for Pt samples). The pretreatment of the support was continued in the ALD reactor for 3 h to remove moisture before the actual runs. Acetylacetone (Hacac, Merck, > 99 %), iridium acetylacetonate (Ir(acac)3, Volatec, > 99 %) and platinum acetylacetonate (Pt(acac)2, Volatec, > 99 %) were used without any further purification. Acetic acid (HAc, Merck, > 99.8 %) was used in the impregnation of a reference sample. 

Figure 2(b)).Fe nanoparticles were also prepared by decomposition of Fe(CO)s in the presence of surfactants (oleic acid and oleyl amine). The monodispersity of the particles was achieved in this case either using platinum acetylacetonate (Pt(acac)2 with acac = (CFl3CO)2CFl)) as heterogeneous nucleation agent or a supersaturation of Fe(CO)s." ... 

Pd and Pt catalysts were obtained by impregnation of the supports with methanolic solutions of palladium or platinum acetylacetonates. The solids were then dried at 383 K for about 15 h. The Pt-Rh/Al203 three-way catalyst was prepared by impregnation of the support with a solution of H2 PtCl6 and RI1CI3 followed by a drying in air at 673 K [5]. 

An interesting approach to synthesize metal alloy nanocrystals is the use of simultaneous salt reduction and thermal decomposition processes. Sun et al. [18] reported on the synthesis of iron-platinum (FePt) nanoparticles through the reduction of platinum acetylacetonate by a diol, and decomposition of iron pentacarbonyl (Fe(CO)5) in the presence of a surfactant mixture (oleic acid and oleyl amine). On the basis of a similar approach, Chen and Nikles [217] synthesized ternary alloy nanoparticles (FC cCo3,Ptioo x-y), using a simultaneous reduction of acetylacetonate and platinum acetylacetonate and thermal decomposition of Fe(CO)5 and obtaining an average particle diameter of 3.5 nm and narrow particle size distribution. 

Synthesis of CoPtj Magnetic Alloy Nanocrystals The synthetic approach developed for the preparation of elemental nanopartides can be further extended to intermetallic compounds. Thus, high-quality CoPt3 nanocrystals can be synthesized via the simultaneous reduction of platinum acetylacetonate and the thermal decomposition of cobalt carbonyl in the presence of 1-adamantanecarboxylic add (ACA) and hexadecylamine (HDA) as stabilizing agents [65]. 

Pdioo-xMox/C nanoparticle catalysts were synthesized by a simultaneous thermal decomposition with palladium acetyla-cetonate, platinum acetylacetonate, and molybdenum carbonyl in o-xylene in the presence of Vulcan XC-72R carbon. At first, the metal precursor and carbon support were mixed together and refluxed and Anally dried, followed by a heat treatment up to 900 °C in H2 atmosphere. ... 

The syntheses of palladium and platinum organosols [82-85] by the thermolyds of such precursors as palladium acetate, palladium acetylacetonate, and platinum acetylacetonate in hi boiling organic solvents like methyl- o-butylketone have been reported. Likewise, bimetallic colloids of copper and palladium have been prepared from the thermolysis of mixtures of their acetates in similar solvents. [86] These preparations were performed in the absence of stabilizing polymers, and as a residt, relatively broad size distributions and large partides were observed. 

Random alloys do not necessarily have the minimum free energy. The ordered structure for intermetallics often represents the local free energy minimum, which may be affected by relative atomic size and electron negativity of the metal atoms [24], FePt nanoparticles with a face-centered tetragonal (fct) phase are among the most-studied intermetallics in recent years [25]. The colloidal FePt nanoparticles are hard to prepare under relatively mild synthetic conditions [25a, 26], An indirect approach is to thermally treat the disordered face-centered cubic (fee) FePt nanoparticles, which are synthesized from iron pentacarbonyl and platinum acetylacetonate in the presence of... 

The FePt particles are commonly synthesized via decomposition of iron pentacarbonyl, Fe(CO)5, and reduction of platinum acetylacetonate, Pt(acac)2, [236] co-reduction of iron salt and Pt(acac)2, [242] or seed-mediated growth where smaller FePt nanoparticles are used as seeds and more FePt is coated over the seeds. The decomposition and reduction or co-reduction methods can jdeld FePt nanoparticles with controlled composition but fail to produce particles larger than 4 nm, while the seed-mediated growth method gives larger FePt particles without accurate control on Fe/Pt ratio at different sizes. As both stmctural and magnetic properties of FePt nanoparticles depend not only on the size, but also on the composition of the particles [243]. 

In the one-step synthesis of FePt nanoparticles, platinum acetylacetonate (Pt(acac)2) and iron pentacarbonyl (Fe(CO)5) and Fe(CO)5 was mixed at excess of stabilizers at 100 °C, then the mixture was heated to more than 200 °C, and kept it at that temperature for Ih, before it was heated to reflux [215, 223]. It was found that with benzyl ether as solvent and oleic acid and oleylamine as stabilizers, one-pot reaction of Fe(CO)5 and Pt(acac)2 could give nanosized FePt particles (3 - 4 nm). Size, composition, and shape of the particles were controlled by varying the synthetic parameters such as molar ratio of stabilizers to metal precursor, addition sequence of the stabilizers and metal precursors, heating rate, heating temperature, and heating duration. Monodisperse FePt nanocrystals were prepared by hydrolysis of pentacarbonyl iron and reduction of metal complexes in the presence of oleic acid and oleylamine [215]. 

It is useful to load microporous solids with little or no exchange capacity. Thus, various metal clusters have been prepared by adsorption and decomposition of metal carbonyls in AIPO4-5 [27,42,43],ZSM-5 [43], and silicalite-1 [44]. Liquid- and vapor-phase impregnations of platinum acetylacetonate were used to load AIPO4-5 and VPI-5 [19]. 

---