Phosphorus-metal ratios

Metal Phosphides. Elementary phosphorus reacts directly with electropositive metals under suitable conditions to give a series of phosphides with different phosphorus-metal ratios ranging from 0.3 in M3P to 16 in M Pi6. Although the structural analysis of such metal phosphides reveals that many of them are... 

Table III summarizes the data in Figure 8. Lead and zinc (low melting point metals) concentrations were much greater in the front of the catalyst than in the rear (30- and 11-fold respectively). With calcium and phosphorus, the ratio of front to rear concentrations was much less, i.e. approximately 4.

The ability of phosphorus to exist as isolated anions or larger anionic polyphosphide networks with P-P bonds enables possible formation of transition metal phosphides [14], which are an important class of binary metal/non-metal compounds with a wide variety of structures, compositions and properties. For example, phosphorus-to-metal ratios in these compounds have a wide range, from metal-rich (MPj where v < 1) to monophosphides (MP) and phosphorus-rich polyphosphides (MPj where x > 1) [93]. 

The metal to phosphorus (or arsenic) ratio varies between 1 1 (alkali metal phosphanides and arsanides) and 2 1 for bis(alkali metal) phosphanediides or arsanediides. In general, these compounds form pnictogen polyhedra with the faces being capped by monovalent metal atoms. For the alkaline-earth metal phosphorus cages, metal to phosphorus ratios between 1 2 for alkaline earth metal bis(phosphanides) and 1 1 for the phosphanediides of the divalent cations are possible. 

A number of other metallic halide salts have been found to condense with ethylene oxide, propylene oxide, or epichlorohydrin in a similar fashion (Eq. 662). Among them are phosphorus trichloride/ 7- a 17 bismuth trichloride,1SM arsenic trichloride,1000 silicon tetrachloride/7 1 titanium tetrachloride/ 09 16,7 beryllium chlorido/189 and Won trifluoride.401 Depending on their reactivity, on the reactant ratio, and... 

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