Pyrophosphate complexe

Smidi, C., and Rayment, I., 1995. X-ray structure of the magnesinm(II)-pyrophosphate complex of the truncated head in Dietyostelium discoideum myosin to 2.7 A resolndon. Biochemistry 34 8973-8981. 

The pyrophosphate complex of Mn(II) ion was found to initiate grafting of acrylonitrile onto cellulose and its derivatives [36,37],... 

Independently the Mn"5 pyrophosphate complexes were developed as efficient initiators at very low concentrations (1 to 3 mmole/1) for grafting of vinyl monomers to starch. High yields of polymer (over 90%) and very high grafting efficiencies (98-99%) were obtained by reactions for 1 to 3 h at room temperature ( 30°C) in moderately acidic aqueous media (pH = 1.5 to 2.0). Co rresponding grafting experiments have later been carried... 

Gardiner and Casey [65] observed the radicals Of, Of, and MOf, which are formed on various electrode surfaces during oxidation processes on different materials in KOH solutions. Studies of copper dissolution in pyrophosphate [66] resulted in polymeric copper pyrophosphate complexes. 

The use of mixed complex baths is interesting since the concentration of one free metal ion may be altered by varying the amount of one ligand. Thus, in a copper—tin bath, cyanide content may be varied to alter the activity of copper ions, with little or no effect on tin which is present as stannate or as a pyrophosphate complex. It is evident that some knowledge of the coordination chemistry will reduce the degree of empiricism in developing alloy plating baths. 

K. Yokoyama and M. H. Gelb. Purification of a mammalian protein geianylgeiaiwltransfeiase. Formation and catalytic properties of an enzyme-geianylgeranyl pyrophosphate complex. J Bid Chem, 268 (6), 4055 060, 1993. 

The pyrophosphate complexes combine with free calcium in saliva to inhibit the attachment at the tooth surface (probably a secondary mechanism). 

In dilute H2SO4 or HCIO4 containing oxidants (BrOs , Cr207 ) manganese(II) reacts with phosphoric acid to give the violet Mn(III) pyrophosphate complex (e = 7.5-10 ) [49-52]. The anionic Mn(III) pyrophosphate complex can be extracted into chloroform in the... 

The pyrophosphate complexes [Cu(P207H2)L ] (L = bipy, phen, py, or [ H5]py n = 1 for bipy and phen n = 2 for py and [ Hj]-py) are essentially four-co-ordinate (P2O7H2 is bidentate) but with long contacts with oxygens of adjacent molecules magnetic moments are unexpectedly low, but full results are not available. The action of propionic acid on basic copper carbonate in j -picoline yields Cu(Me-CH2C00)2, -picoline = 1.5 BM). The complex is dinuclear, Cu Cu =... 

The enzyme seems to have two binding sites for phosphate per subunit, one high affinity site and another site of lower affinity. The substrate for the enzyme in the hydrolytic direction is the Mg pyrophosphate complex. There is still some discussion as to whether the substrate is a P P, chelate... 

Table V-29 Experimental values for the association constants and other thermodynamic quantities for nickel pyrophosphate complexes.

VAI/RAM] Vaid, J., Rama Char, T. L., Physico-chemical studies on pyrophosphate complexes of bivalent metals. Bull. India Sect., Electrochem. Soc., 7, (1958), 5-13. Cited on pages 207, 209, 289. 

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