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zhangquee
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CCD2004上信息 Diphosphoric acid Synonym(s): Pyrophosphoric acid. Heptaoxodiphosphoric(V,V) acid. P5OP5 acid. Tetrahydrogen -oxo-hexaoxophosphate. -Oxo-hexaoxodiphosphoric acid CRC Number: HTV84-C CAS Registry Number: 2466-09-3 (HO)2P(O)OP(O)(OH)2 Molecular Formula: H4O7P2 Molecular Weight: 177.975 Accurate Mass: 177.943229 Percentage Composition: H 2.27%; O 62.93%; P 34.81% Source/Synthesis: Synth. from H3PO4 + P4O10, or by heating H3PO4 at 100-200 Biological Use/Importance: Present in normal plasma and other biological fluids, bone and teeth. Abnormality in metabolism leads to hypophosphatasia - an inherited bone disease. Many organic derivs. are also biologically important being involved in biological phosphorylations Dissociation Constant: pKa1 0.8; pKa2 1.8; pKa3 6.04; pKa4 9 (25) pKa3 5.98; pKa4 8.3 pKa3 5.76; pKa4 8.04 RCB_CT,229949Variant: I-form CRC Number: JNT71-S Molecular Formula: H4O7P2 Molecular Weight: 177.975 Accurate Mass: 177.943229 Percentage Composition: H 2.27%; O 62.93%; P 34.81% Physical Description: Orthorhombic, colourless cryst. Metastable Melting Point: Mp 54.3 Other Data: Converts into form II when heated in sealed tube at 50 RCB_CT,229950Variant: II-form CRC Number: HTV92-D Molecular Formula: H4O7P2 Molecular Weight: 177.975 Accurate Mass: 177.943229 Percentage Composition: H 2.27%; O 62.93%; P 34.81% Physical Description: Orthorhombic, colourless cryst Melting Point: Mp 71.5 Other Data: Stable at r.t. RCB_CT,229951Derivative: Tetra-NH4 salt see Ammonium diphosphate ((NH4)4(P2O7)), HTW32-Q CRC Number: HTV93-E RCB_CT,229952Derivative: Tetra-Li salt see Lithium diphosphate (Li4(P2O7)), HTW35-T CRC Number: JNT72-T RCB_CT,229953Derivative: Tetra-Na salt see Sodium diphosphate (Na4(P2O7)), HTW34-S CRC Number: HTL80-A RCB_CT,229954Derivative: Tetra-K salt see Potassium diphosphate (K4(P2O7)), HTW33-R CRC Number: HTL64-Y References: Inorg. Synth., 1950, 3, 96 (synth, props) Wakefield, Z. et al., J. Agric. Food Chem., 1962, 10, 344 (props) Gmelin Handbook Inorg. Chem., Syst. No. 16, 1965, 224 Russell, R.G.G. et al., Br. J. Hosp. Med., 1975, 14, 299 (metab, physiol) Russell, R.G.G. et al., Clin. Orthop. Relat. Res., 1975, 108, 241 (rev, biol importance) Fluck, E. et al., Pure Appl. Chem., 1975, 44, 373 (pe) Geraldes, C.F.G.C. et al., J. Inorg. Biochem., 1989, 37, 213 (P-31 nmr) |
3楼2008-09-26 10:55:52
hpyou
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2楼2008-09-26 10:38:12