Phosphorus chalcogenides

Phosphorus Chalcogenides [P Em] and Chalcogeno-Phosphate Anions [PnEm]z... 

Phosphorus Chalcogenide Glasses P NMR of AIPO4 Molecular Sieves P NMR of Biomaterials... 

Phosphorus Chalcogenides (Pn m) ond Chalcogeno-Phosphate Anions [PnEn,] ... 

The extent of restricted rotation about the amide band of (38) was used to compare the electron-withdrawing process of phosphonium salts (38, Y = alkyl) and chalcogenides (38, Y = O or S) with the more conventional electron-withdrawing groups. These phosphorus groups were found to exert a — A7 effect comparable with that of a nitro-group. 

Table 1 Phosphorus sulfides and structurally analogous group 15 chalcogenides...

Studies on the solid-state structures, vibrational frequencies and dipole moments of tertiary phosphine chalcogenides have shown the phosphorus to be in an approximately tetrahedral environment with phosphorus-chalcogen bond lengths in-between those expected for single and double bonds.21 There has been much debate on the nature of the phosphorus-chalcogen bond in these... 

Diphosphine mono-chalcogenides are able to bind to metal centres from either one of or both the phosphorus(III) and chalcogen donor centres. This has led to their study as hemi-labile ligands in catalyst systems, whereby one of the donor centres binds strongly to the metal centre and the other one is weakly bound and hence can be readily dissociated or reattached to reveal or protect the active site at a metal centre.28... 

Gallium(III) azide, 72 360 Gallium-based laser diodes, 72 349 Gallium chalcogenides, 72 359 Gallium compounds, 72 344, 355-361 with ammonia, 72 357-358 with phosphorus, arsenic, and antimony, 72 360... 

The abbreviations Pm, PIV, and Pv refer to the co-ordination number of phosphorus and the compounds in each subsection are usually dealt with in this order. A number of relevant theoretical and inorganic studies are included in this chapter. In the formulae the letter R represents hydrogen, alkyl, or aryl, X represents electronegative substituents, Ch represents the chalcogenides (usually oxygen and sulphur), and Y and Z are used to indicate a wide variety of substituents. 

Phosphorotrithioite, 21 61 Phosphorus, 33 106-107 acids, pK values of, 3 383 bond angles in trihalides, 13 365 bromochlorides, 7 12 bromofluorides, 7 8-9, 10 chalcogenide halides, 23 400 chloFofluorides, 7 8, 9-10 complexes, xenon fluoride reactions, 46 86 compounds... 

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