Phosphides transition metal

C. C. Cummins, Terminal, Anionic Carbide, Nitride, and Phosphide Transition-Metal Complexes as Synthetic Entries to Low-Coordinate Phosphorus Derivatives, Angew. Chem. Int. Ed. 45, 862-870 (2006). 

Cummins CC (2006) Terminal, anionic carbide, nitride, and phosphide transition-metal complexes as synthetic entries to low-coordinate phosphcnus derivatives. Angew Chem Int Ed 45 862-870... 

Compounds with Sc, Y, lanthanoids and actinoids are of three types. Those with composition ME have the (6-coordinated) NaCl structure, whereas M3E4 (and sometimes M4E3) adopt the body-centred thorium phosphide structure (Th3P4) with 8-coordinated M, and ME2 are like ThAsi in which each Th has 9 As neighbours. Most of these compounds are metallic and those of uranium are magnetically ordered. Full details of the structures and properties of the several hundred other transition metal-Group 15 element compounds fall outside the scope of this treatment, but three particularly important structure types should be mentioned because of their widespread occurrence and relation to other structure types, namely C0AS3,... 

The extension of this approach to artificial leaves based on titanates, niobates, tantalates, metal nitrides and phosphides, metal sulfides, and other transition metal oxides appears possible and useful in order to enhance the photocatalytic efficiency. In addition, the construction of multicomponent systems such as Ti02-CdS or MoS2-CdSe for overall water splitting could also lead to further improvements. This... 

Transition-Metal Arsenides, MAs, and Mixed Arsenide Phosphides, MAsi yPy... 

Among binary transition-metal pnictides, only the first-row transition-metal phosphides have been analysed by XPS extensively, whereas arsenides and antimonides have been barely studied [51-61]. Table 2 reveals some general trends in the P 2p3/2 BEs for various first-row transition-metal monophosphides, as well as some metaland phosphorus-rich members forming for a given transition metal. Deviations of as much as a few tenths of an electron volt are seen in the BEs for some compounds measured multiple times by different investigators (e.g., MnP), but these... 

Table 2 P 2p3/2 BEs for various binary first-row transition-metal phosphides...

Heterometallic alkali metal phosphide complexes with transition metals have also been reported. The complex [(Cy2P)3Hf(ju.-PCy2)2Li (DME)] results from the reaction of LiPCy2 with HfCl4(THF) (98). This complex persists in solution. Jones et al. have reported the synthesis and reactivity toward a range of electrophiles of a series of lithium di-t-butylphosphido(alkyl)cuprates [RCu(PBu2)Li] (R = Me,... 

In the review by Kanatzidis et al. (2005), the preparation by the tin-flux method is mentioned also for several ternary phosphides and polyphosphides of rare-earth and transition metals. Typically the components (R metal, T metal, P and Sn in an atomic ratio of about 1 4 20 50) in sealed silica tubes were slowly heated, to avoid violent reactions, up to 800°C, annealed at that temperature for 1 week and slowly (2 K/h) cooled to ambient temperature. The tin-rich matrix was dissolved in diluted hydrochloric acid. The authors described the preparation of compounds corresponding for instance to the formula MeT4P12 (Me = heavy rare-earth metals and Th and U, T = Fe, Ru, etc.) and to the series of phases MeT2P2 (Me is a lanthanide or an actinide and T a late transition metal) having a structure related to the BaAl4 or ThCr2Si2 types. 

Brock SL, Perera SC, Stamm KL. Chemical routes for production of transition-metal phosphides on the nanoscale implications for advanced magnetic and catalytic materials. Chem Eur J 2004 10 3364-3371. 

The superconductivity in transition metal sulfides, selenides, and phosphides possessing the NaCl structure is presented in the excellent review (7). 

The various techniques for the synthesis of transition metal phosphides have been summarized in the monograph by Aronsson, Lundstrom, and Rundqvist.1 The most common method used for the preparation of the phosphides is the direct combination of the elements. However, in general, the products are not pure or... 

II-VI and III-V compounds, borides, carbides, nitrides and silicides of transition metals, as well as sulphides, phosphides, aluminides, etc. A1203, AIN, B203, BN, SiC, Si3N4, U02, Y203, Zr02, etc. 

Rundqvist, S. Binary Transition-Metal Phosphides. Arkiv Kemi 20, 67 (1962). 

There are only a few reported examples of olefin polymerization catalyzed by heterobimetallic complexes in these, bis(cyclopentadienyl) M (M = Zr, Ti) moieties are cormected to other transition metals via phosphide or nitrogen ligands (55). The microstructures of the polymer products can be controlled by changing the ligand envirorunent surrounding the metal centers, which in turn leads to different specificities of the separate active species. Therefore, the attractive possibility of bringing two catalytic centers into a close, constrained proximity offers the potential for significantly enhanced catalytic efficiency. 

A second, very important decomposition pathway involves the activation of C-H bonds on the N-alkyl [142-147] or N-aryl [148-151] sidechains. OccassionaUy, even C-C activation in the sidechain is observed [152]. Similar C-H activation is observed in transition metal phosphides, especially when the phosphorus ligand has a SMes substituent [153]. 

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