Metals phosphorus

In many of their complexes PF3 and PPI13 (for example) resemble CO (p. 926) and this at one time encouraged the belief that their bonding capabilities were influenced not only by the factors (p. 198) which affect the stability of the a P M interaction which uses the lone-pair of elecU"ons on p and a vacant orbital on M, but also by the possibility of synergic n back-donation from a nonbonding d , pair of electrons on the metal into a vacant 3d , orbital on P. It is, however, not clear to what extent, if any, the a and n bonds reinforce each other, and more recent descriptions are based on an MO approach which uses all (cr and n) orbitals of appropriate symmeU"y on both the phosphine and the metal-containing moiety. To the extent that a and n bonding effects on the stability of metal-phosphorus bonds can be isolated from each otlier and from steric factors (see below) the accepted sequence of effects is as follows ... 

Spectroscopic studies of metal-phosphorus bonding in coordination complexes. J. G. Verkade, Coord. Chem. Rev., 1972, 9, 1-106 (308). 

Ar ring contributions to 31P n.m.r. parameters of transition metal-phosphorus chelate complexes. P. E. Garron, Chem. Rev., 1981,81,229-266 (93). 

Koch P, Rumpel H, Sutter P, et al. 1989. The reaction of alkanephosphonic acid esters with metals. Phosphorus, Sulfur, Silicon, and Related Elements 44(l-2) 75-85. 

The rising cost of scrap and waste disposal, the scarcity of onsite landfill space, and potential environmental liabilities make it an economic necessity to recover iron units from dust and sludge. However, recycling to the blast furnace raises the hot metal phosphorus content to undesirable levels. 

Metal-Phosphorus Bono Lengths, Torsion Angles between the Metal and Phosphorus Coordination Planes, Sums of Angles at Phosphorus, and 3IP NMR Chemical Shifts for Three-Coordinate Aluminum, Gallium, and Indium Phosphides... 

Baars MWPL, Meijer EW (2000) Host-Guest Chemistry of Dendritic Molecules. 210 131-182 Balazs G, Johnson BP, Scheer M (2003) Complexes with a Metal-Phosphorus Triple Bond. 232 1-23... 

Nazarov, A. A. Dyson, P. J. Metal phosphorus complexes as antitumor agents. In Phosphorus Chemistry Catalysis and Material Science Applications, Vol. 37 (eds. Gonsalvi, L. Peruzzini, M.) 445-461 (Springer 2011). 

In addition, X-ray diffraction analysis of related molecules reveals that in the sixth (formally unoccupied) position of the octahedron the metallic center is well shielded. Four of the 12 methyl groups of the phosphine ligands surround the metal like an umbrella. As a result of the shielding effect of the methyl groups, a bending of the phosphorus-metal-phosphorus axis is observed.24... 

MRH Aluminium 10.71/33, iron 4.35/50, magnesium 10.88/40, manganese 5.06/50, sodium 5.56/55, phosphorus 7.32/25, sulfur 4.27/20 Mixtures of the chlorate with ammonium salts, powdered metals, phosphorus, silicon, sulfur or sulfides are readily ignited and potentially explosive [1], Residues of ammonium thiosulfate in a bulk road tanker contaminated the consignment of dry sodium chlorate subsequently loaded, and exothermic reaction occurred with gas evolution during several hours. Laboratory tests showed that such a mixture could be made to decompose explosively. A reaction mechanism is suggested. 

Transition-metal phosphorus trichalcogenides such as MnPS3 are able to intercalate amino acids and peptides by ion exchange. In this way, increases in the basal spacing of 0.7 and 3-4 nm are observed for the intercalation of poly-L-lysine and lysozyme, respectively [224]. Interestingly, the enzymatic activity of the immobilized protein has been detected, suggesting that the enzyme is protected against denaturation. 

Bismuth has the largest atom of any element of Group V, and it holds its electrons less tightly than the others do. It is a metal, but not a very good one. It is brittle and is also a poor conductor of electricity. Antimony and arsenic are semi-metals. Phosphorus and nitrogen are not metallic at all. Nitrogen exists in nature as a gas. 

Isomerization of Betaines to Metallated Phosphorus and Arsenic Ylides (Direction A)... 

It is a challenge to study dimetalated derivatives of primary phos-phanes that possess more covalent metal-phosphorus bonds. This can be achieved through replacement of the alkali metal ions in bimetallic phosphandiides by monovalent coin metal centers. 

In contrast to magnesium phosphandiides, analogous tin(II) derivatives possess more covalent metal-phosphorus bonds. This basic difference is also apparent for dilithium versus dicopper(I) phosphandiides (see Section II and III). It is, therefore, interesting to assess the structural and electronic features of such species in a similar way. To date, only three tin(II) phosphandiide derivatives have been prepared... 

Metal oxide sensors (MOS), smart, 22 717 Metal oxide supported catalysts, 5 336-337 coke formation on, 5 267—270 Metal passivation, in industrial water treatment, 26 137 Metal peroxides, 18 410 Metal phosphates, tertiary, 18 840 Metal-phosphorus alloys, 19 59 Metal phthalocyanines, electrochromic materials, 6 572t, 576-577 Metal prefinishing, detersive systems for, 8 413t... 

Alkali Metal-Phosphorus and Alkali Metal-Arsenic Clusters I 403... 

Metal-Phosphorus and Alkali Metal—Arsenic Clusters I 409... 

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. 

ALKYLHALOPHOSPHINES, ALKYLPHOSPHINES tert-BUTYL PEROXOPHOSPHATE ESTERS iV-CHLORINATED PHOSPHORUS AMIDES HALOPHOSPHINES, METAL PHOSPHINATES METAL PHOSPHORUS TRISULFIDES NON-METAL OXIDES, NON-METAL SULFIDES PHOSPHINES, PHOSPHORUS ESTERS... 

See also ALKANETHIOLS, ALKENEBIS(SULFONIUM PERCHLORATES) allyl trifluo-ROMETHANESULFONATES, ARENEDIAZO ARYL SULFIDES BIS(ARENEDIAZO) sulfides, BIS(SULFURDIIMIDES DIAZONIUM SULFATES, DIAZONIUM SULFIDES AND DERIVATIVES METAL AMIDOSULFATES, METAL PHOSPHORUS TRISULFIDES METAL SULFATES, METAL SULFIDES, NON-METAL SULFIDES SULFONIC ACID ESTERS, SULFUR BLACK, SULFUR ESTERS THIOPHENOXIDES, XANTHATES ... 

As seen, the progressive electron additions cause a lengthening of the metal-metal bonds, which is compensated by a slight shortening of the metal-phosphorus distances, while the metal-sulfur distances remain essentially unchanged. 

Balazs G, Johnson BP, Scheer M (2003) Complexes with a Metal-Phosphorus Triple Bond. 

The remarkable ideally cubic mixed metal/pnicogen Sb4 [ 0(00)314 (50), or P4[SnPhl4 (51), and tetragonally distorted metal/phosphorus P4 [CpCo]4 ( ) cubane-like clusters (Figure 4), obtained by Dahl or Schumann, may be viewed along similar lines. 

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