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  • High quality Ethylenediamine-N,N,N',N'-Tetrakis-(Methylenephosphonic Acid) 95% supplier in China

    Cas No: 1429-50-1

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  • China Biggest factory Supply High Quality Ethylenebis(nitrilodimethylene)tetraphosphonic acid/EDTMPA CAS 1429-50-1

    Cas No: 1429-50-1

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1429-50-1 Usage

Description

Ethylenebis(nitrilodimethylene)tetraphosphonic acid, also known as Ethylenediaminetetra(methylenephosphonic acid), is a nitrogenous polyphosphonic acid chelator that possesses the ability to form complexes with various metal ions. This unique property makes it a versatile compound with a wide range of applications across different industries.

Uses

Used in Water Treatment Industry:
Ethylenebis(nitrilodimethylene)tetraphosphonic acid is used as a scale inhibitor for preventing the formation of mineral deposits, such as calcium and magnesium, in water systems. Its ability to complex with metal ions helps to reduce the risk of scaling and fouling, ensuring the efficient operation of water treatment facilities.
Used in Industrial Cleaning:
In the industrial cleaning sector, Ethylenebis(nitrilodimethylene)tetraphosphonic acid is utilized as a cleaning agent to remove metal ions and deposits from surfaces. Its chelating properties enable it to effectively bind and remove contaminants, resulting in cleaner and more efficient industrial processes.
Used in Agriculture:
Ethylenebis(nitrilodimethylene)tetraphosphonic acid is employed as a chelating agent in the agriculture industry to improve the availability and uptake of essential nutrients by plants. By forming complexes with metal ions in the soil, it enhances nutrient solubility and absorption, leading to increased crop yields and improved plant health.
Used in Oil and Gas Industry:
In the oil and gas sector, Ethylenebis(nitrilodimethylene)tetraphosphonic acid is used as a corrosion inhibitor to protect pipelines and equipment from the damaging effects of metal corrosion. Its ability to complex with metal ions helps to reduce the rate of corrosion, prolonging the lifespan of infrastructure and minimizing maintenance costs.
Used in Nuclear Industry:
Ethylenebis(nitrilodimethylene)tetraphosphonic acid is utilized as a chelating agent in the nuclear industry for the removal and sequestration of radioactive metal ions. Its ability to form stable complexes with these ions helps to facilitate the safe and efficient management of radioactive waste, reducing the risk of environmental contamination.
Used in Pharmaceutical Industry:
In the pharmaceutical sector, Ethylenebis(nitrilodimethylene)tetraphosphonic acid is used as a chelating agent in the development of drugs and drug delivery systems. Its ability to form complexes with metal ions can enhance the stability, solubility, and bioavailability of pharmaceutical compounds, leading to improved therapeutic outcomes.
Used in Analytical Chemistry:
Ethylenebis(nitrilodimethylene)tetraphosphonic acid is employed as a chelating agent in analytical chemistry for the selective complexation and detection of metal ions. Its high affinity for various metal ions makes it a valuable tool in the analysis and quantification of metal ion concentrations in samples.

Flammability and Explosibility

Notclassified

Check Digit Verification of cas no

The CAS Registry Mumber 1429-50-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,4,2 and 9 respectively; the second part has 2 digits, 5 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 1429-50:
(6*1)+(5*4)+(4*2)+(3*9)+(2*5)+(1*0)=71
71 % 10 = 1
So 1429-50-1 is a valid CAS Registry Number.
InChI:InChI=1/C6H20N2O12P4/c9-21(10,11)3-7(4-22(12,13)14)1-2-8(5-23(15,16)17)6-24(18,19)20/h1-6H2,(H2,9,10,11)(H2,12,13,14)(H2,15,16,17)(H2,18,19,20)

1429-50-1 Well-known Company Product Price

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  • TCI America

  • (E0393)  N,N,N',N'-Ethylenediaminetetrakis(methylenephosphonic Acid)  >98.0%(T)

  • 1429-50-1

  • 25g

  • 330.00CNY

  • Detail
  • TCI America

  • (E0393)  N,N,N',N'-Ethylenediaminetetrakis(methylenephosphonic Acid)  >98.0%(T)

  • 1429-50-1

  • 100g

  • 790.00CNY

  • Detail
  • TCI America

  • (E0393)  N,N,N',N'-Ethylenediaminetetrakis(methylenephosphonic Acid)  >98.0%(T)

  • 1429-50-1

  • 500g

  • 2,450.00CNY

  • Detail

1429-50-1SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 10, 2017

Revision Date: Aug 10, 2017

1.Identification

1.1 GHS Product identifier

Product name [1,2-Ethanediylbis[Nitrilobis-(Methylene)]]Tetrakis-Phosphonic Acid

1.2 Other means of identification

Product number -
Other names Ethylenediaminetetra(methylenephosphonic acid)

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:1429-50-1 SDS

1429-50-1Synthetic route

formaldehyd
50-00-0

formaldehyd

ethylenediamine
107-15-3

ethylenediamine

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

Conditions
ConditionsYield
Stage #1: ethylenediamine With hydrogenchloride; phosphonic Acid In water for 0.0333333h; Microwave irradiation;
Stage #2: formaldehyd In water for 0.166667h; Irani-Moedritzer reaction; Microwave irradiation;
63%
With hydrogenchloride; phosphonic Acid
With hydrogenchloride; phosphonic Acid In water Heating;
formaldehyd
50-00-0

formaldehyd

ethylenediamine
107-15-3

ethylenediamine

A

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

B

N-methylethylenediamine-N,N',N'-trimethylenetris(phosphonic acid)

N-methylethylenediamine-N,N',N'-trimethylenetris(phosphonic acid)

Conditions
ConditionsYield
Stage #1: ethylenediamine With phosphorous acid In water at 136℃; Reflux;
Stage #2: formaldehyd In water at 130 - 136℃; for 4.33333h;
A 48.2%
B 28.8%
formaldehyd
50-00-0

formaldehyd

ethylenediamine
107-15-3

ethylenediamine

A

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

B

<<(2-aminoethyl)imino>bis(methylene)>biphosphonic acid

<<(2-aminoethyl)imino>bis(methylene)>biphosphonic acid

Conditions
ConditionsYield
With hydrogenchloride; phosphoric acid In water at 100℃; for 3h;A 18.8%
B 36.7%
chloromethylphosphonic acid
2565-58-4

chloromethylphosphonic acid

ethylenediamino tris(methylenephosphonic acid)
1898-63-1

ethylenediamino tris(methylenephosphonic acid)

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

Conditions
ConditionsYield
With sodium hydroxide
ethylenediamine
107-15-3

ethylenediamine

CH3Cl2O2P

CH3Cl2O2P

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

Conditions
ConditionsYield
(i) aq. NaOH, (ii) /BRN= 605263/; Multistep reaction;
ethylenediamine
107-15-3

ethylenediamine

disodium-salt of/the/ chloromethylphosphonic acid

disodium-salt of/the/ chloromethylphosphonic acid

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

Conditions
ConditionsYield
With sodium carbonate
formaldehyd
50-00-0

formaldehyd

ethylenediamine
107-15-3

ethylenediamine

A

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

B

ethylenediamino tris(methylenephosphonic acid)
1898-63-1

ethylenediamino tris(methylenephosphonic acid)

Conditions
ConditionsYield
With phosphorous acid; methanesulfonic acid In water at 105 - 130℃; for 2.5 - 6h; Product distribution / selectivity; Heating / reflux;A 40 - 73.6 %Spectr.
B n/a
With phosphorous acid; methanesulfonic acid; sulfuric acid In water at 105℃; for 6.33333h; Product distribution / selectivity; Heating / reflux;A 75.5 %Spectr.
B n/a
formaldehyd
50-00-0

formaldehyd

ethylenediamine
107-15-3

ethylenediamine

A

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

B

ethylenediamino tris(methylenephosphonic acid)
1898-63-1

ethylenediamino tris(methylenephosphonic acid)

C

<<(2-aminoethyl)imino>bis(methylene)>biphosphonic acid

<<(2-aminoethyl)imino>bis(methylene)>biphosphonic acid

D

N-methylethylenediamine-N,N',N'-trimethylenetris(phosphonic acid)

N-methylethylenediamine-N,N',N'-trimethylenetris(phosphonic acid)

Conditions
ConditionsYield
With hydrogenchloride; phosphorous acid In water at 110℃; for 3h; Product distribution / selectivity;
ethylenediaminetetraacetic acid
60-00-4

ethylenediaminetetraacetic acid

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

Conditions
ConditionsYield
With phosphorus(III) oxide; methanesulfonic acid at 45 - 80℃; for 2h;94.5 %Spectr.
N,N,N',N'-tetrakis(hydroxymethyl)ethanediamine
98756-99-1

N,N,N',N'-tetrakis(hydroxymethyl)ethanediamine

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

Conditions
ConditionsYield
Stage #1: N,N,N',N'-tetrakis(hydroxymethyl)ethanediamine With phosphorus(III) oxide; methanesulfonic acid at 50 - 80℃; for 1h;
Stage #2: With water at 25℃; for 1h; Temperature; Concentration;
aluminum sulfate octadecahydrate

aluminum sulfate octadecahydrate

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

aluminum ethylenediamine tetra(methylene phosphonate)

aluminum ethylenediamine tetra(methylene phosphonate)

Conditions
ConditionsYield
With sodium hydroxide In water at 90℃; for 1h; Reagent/catalyst; Time; Large scale;97.4%
potassium aquapentachlororuthenate(III)

potassium aquapentachlororuthenate(III)

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

K3{ruthenium(III)(ethylenediamine-N,N,N',N'-tetramethylphosphonato)*6H2O}

K3{ruthenium(III)(ethylenediamine-N,N,N',N'-tetramethylphosphonato)*6H2O}

Conditions
ConditionsYield
With KOH In water byproducts: RuO2; equimolar quantity of reagents; heated on water-bath for 30 min; filtered; heated for 1-1.5 h; added KOH (pH=5); filtered; evapd.; ground with acetone; filtered off; washed (mixture of methanol and ethanol (2/1)); elem. anal.; TA; UV;90%
potassium aquapentachlororuthenate(III)

potassium aquapentachlororuthenate(III)

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

K3{ruthenium(III) (ethylenediamine-N,N,N',N'-tetramethylphosphonato)Cl4}*2H2O

K3{ruthenium(III) (ethylenediamine-N,N,N',N'-tetramethylphosphonato)Cl4}*2H2O

Conditions
ConditionsYield
In water byproducts: RuO2; equimolar quantity of reagents; heated on water-bath for 30-40 min; filtered; evapd. on water-bath; ground with acetone; filtered off; washed (acetone); dried in vac. desiccator; elem. anal.; TA; UV;83%
vanadium(IV) chloride

vanadium(IV) chloride

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

water
7732-18-5

water

C6H16N2O12P4(VO)1.8*4H2O

C6H16N2O12P4(VO)1.8*4H2O

Conditions
ConditionsYield
In water ligand in H2O mixed with AlCl3 in H2O; centrifuged, treated with 0.02 M HCl, stirred in ultrasonic bath for 30 min, standed overnight at room temp., the same treatment repeated 3 times, H2O added, lyohpylized overnight, elem. anal.;78%
1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

water
7732-18-5

water

zinc(II) chloride
7646-85-7

zinc(II) chloride

([Zn2(N,N,N',N'-ethylenediaminetetrakis(methylenephosphonic acid)(-4H))]*2H2O)(n)

([Zn2(N,N,N',N'-ethylenediaminetetrakis(methylenephosphonic acid)(-4H))]*2H2O)(n)

Conditions
ConditionsYield
With LiF; (C2H5)3N In ethanol; water High Pressure; adjusted to pH 5.3 with (C2H5)3N, kept in an autoclave at 160°C for 4 d; elem. anal.;77%
aluminium trichloride
7446-70-0

aluminium trichloride

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

water
7732-18-5

water

aluminium(III) ethylenediaminetetramethylenephosphonate tetrahydrate

aluminium(III) ethylenediaminetetramethylenephosphonate tetrahydrate

Conditions
ConditionsYield
In water ligand in H2O mixed with AlCl3 in H2O; centrifuged, treated with 0.02 M HCl, stirred in ultrasonic bath for 30 min, standed overnight at room temp., the same treatment repeated 3 times, H2O added, lyohpylized overnight, elem. anal.;76%
cobalt(II) nitrate hexahydrate

cobalt(II) nitrate hexahydrate

2-(1-(pyrazin-2-yl)ethylidene)hydrazine-1-carbothioamide
153736-25-5

2-(1-(pyrazin-2-yl)ethylidene)hydrazine-1-carbothioamide

sodium molybdate dihydrate
7631-95-0

sodium molybdate dihydrate

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

Mo12O40P(3-)*3C14H16CoN10S2(1+)

Mo12O40P(3-)*3C14H16CoN10S2(1+)

Conditions
ConditionsYield
Stage #1: cobalt(II) nitrate hexahydrate; 1-(1-(pyrazin-2-yl)ethylidene)thiosemicarbazide; sodium molybdate dihydrate; 1,2-ethanediylbistetraphosphonic acid In water; acetonitrile at 20℃; for 2h;
Stage #2: With hydrogenchloride In water; acetonitrile at 130℃; for 72h; pH=2.7 - 3; Autoclave;
52.7%
cobalt(II) nitrate hexahydrate

cobalt(II) nitrate hexahydrate

sodium tungstate (VI) dihydrate
10213-10-2

sodium tungstate (VI) dihydrate

2-(1-(pyrazin-2-yl)ethylidene)hydrazine-1-carbothioamide
153736-25-5

2-(1-(pyrazin-2-yl)ethylidene)hydrazine-1-carbothioamide

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

O40PW12(3-)*3C14H16CoN10S2(1+)

O40PW12(3-)*3C14H16CoN10S2(1+)

Conditions
ConditionsYield
Stage #1: cobalt(II) nitrate hexahydrate; sodium tungstate (VI) dihydrate; 1-(1-(pyrazin-2-yl)ethylidene)thiosemicarbazide; 1,2-ethanediylbistetraphosphonic acid In methanol; water at 20℃; for 2h;
Stage #2: With hydrogenchloride In methanol; water at 130℃; for 72h; pH=3 - 3.35; Autoclave;
47.8%
potassium aquapentachlororuthenate(III)

potassium aquapentachlororuthenate(III)

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

A

K9{ruthenium(III)3(ethylenediamine-N,N,N',N'-tetramethylphosphonato)2Cl8}*7H2O

K9{ruthenium(III)3(ethylenediamine-N,N,N',N'-tetramethylphosphonato)2Cl8}*7H2O

B

K3.5{ruthenium(III)5(ethylenediamine-N,N,N',N'-tetramethylphosphonic)2Cl2.5}*5H2O

K3.5{ruthenium(III)5(ethylenediamine-N,N,N',N'-tetramethylphosphonic)2Cl2.5}*5H2O

Conditions
ConditionsYield
In water Ru/EDTP = 2/1; complex added to hot soln. of ligand, heated for 1 h; pentahydrate washed with water, dried in vac. desiccator, filtrate evapd.; ground with ethanol; dried in vac. desiccator; TA; UV, elem. anal.;A 37%
B 8.1%
1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

water
7732-18-5

water

lead acetate
301-04-2

lead acetate

([Pb7(N,N,N',N'-ethylenediaminetetrakis(methylenephosphonic acid)(-7H))2(H2O)]*7H2O)(n)

([Pb7(N,N,N',N'-ethylenediaminetetrakis(methylenephosphonic acid)(-7H))2(H2O)]*7H2O)(n)

Conditions
ConditionsYield
With LiF; (C2H5)3N In ethanol; water High Pressure; adjusted to pH 5-6 with (C2H5)3N, kept in an autoclave at 140°C for 4 d; cooled slowly to room temp., crystals sepd. manually; elem. anal.;35%
potassium aquapentachlororuthenate(III)

potassium aquapentachlororuthenate(III)

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

K2H{ruthenium(III)2(ethylenediamine-N,N,N',N'-tetramethylphosphonato)3Cl6}*12H2O

K2H{ruthenium(III)2(ethylenediamine-N,N,N',N'-tetramethylphosphonato)3Cl6}*12H2O

Conditions
ConditionsYield
In water equimolar quantity of reagents; heated on water-bath for 30 min; filtered; evapd.; ground with acetone; filtered off; dried in vac. desiccator; elem. anal.; TA; UV;27.2%
1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

C6H20N2O14P4

C6H20N2O14P4

Conditions
ConditionsYield
With sodium hydroxide; dihydrogen peroxide In water at 60℃; pH 9;
1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

lanthanum(III) chloride
10099-58-8

lanthanum(III) chloride

La(3+)*5H(1+)*(O3PCH2)2NCH2CH2N(CH2PO3)2(8-)*H2O=LaH5((O3PCH2)2NCH2CH2N(CH2PO3)2)*H2O

La(3+)*5H(1+)*(O3PCH2)2NCH2CH2N(CH2PO3)2(8-)*H2O=LaH5((O3PCH2)2NCH2CH2N(CH2PO3)2)*H2O

Conditions
ConditionsYield
With potassium hydroxide In not given molar ratio La:ligand=1:1, pH=1.24-2.16 (pptn.); filtration, washing (EtOH, acetone, ether), drying (105°C); elem.anal.;
1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

lanthanum(III) chloride
10099-58-8

lanthanum(III) chloride

K(1+)*La(3+)*4H(1+)*(O3PCH2)2NCH2CH2N(CH2PO3)2(8-)*H2O=KLaH4((O3PCH2)2NCH2CH2N(CH2PO3)2)*H2O

K(1+)*La(3+)*4H(1+)*(O3PCH2)2NCH2CH2N(CH2PO3)2(8-)*H2O=KLaH4((O3PCH2)2NCH2CH2N(CH2PO3)2)*H2O

Conditions
ConditionsYield
With potassium hydroxide In not given molar ratio La:ligand=1:1, pH=3.65 (pptn.); filtration, washing (EtOH, acetone, ether), drying (105°C); elem.anal.;
cis-dichlorobis(ethylenediamine)cobalt(III) chloride

cis-dichlorobis(ethylenediamine)cobalt(III) chloride

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

[Co(NH2CH2CH2NH2)2]C6H15N2P4O12

[Co(NH2CH2CH2NH2)2]C6H15N2P4O12

Conditions
ConditionsYield
In water 50°C, cooling 0°C; without separation;
cis-[CoCl(NH3)(ethylenediamine)2]Cl2

cis-[CoCl(NH3)(ethylenediamine)2]Cl2

1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

[Co(N2H4C2H4)2(NH3)]C6H16N2P4O12

[Co(N2H4C2H4)2(NH3)]C6H16N2P4O12

Conditions
ConditionsYield
In water 50°C, cooling 0°C; without separation;
1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

holmium(III) nitrate

holmium(III) nitrate

Ho(3+)*5H(1+)*C6H12N2O12P4(8-)*3H2O=Ho(H5C6H12N2O12P4)*3H2O

Ho(3+)*5H(1+)*C6H12N2O12P4(8-)*3H2O=Ho(H5C6H12N2O12P4)*3H2O

Conditions
ConditionsYield
In water ligand metal ion mole ratio 1.0:1.6; washing, drying in dry air at 25°C;
1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

holmium(III) nitrate

holmium(III) nitrate

4Ho(3+)*12H(1+)*3C6H12N2O12P4(8-)*25H2O=Ho4(H4C6H12N2O12P4)3*25H2O

4Ho(3+)*12H(1+)*3C6H12N2O12P4(8-)*25H2O=Ho4(H4C6H12N2O12P4)3*25H2O

Conditions
ConditionsYield
In water ligand metal ion mole ratio 0.5:0.6; washing, drying in dry air at 25°C;
1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

gadolinium(III) nitrate

gadolinium(III) nitrate

4Gd(3+)*12H(1+)*3C6H12N2O12P4(8-)*20H2O=Gd4(H4C6H12N2O12P4)3*20H2O

4Gd(3+)*12H(1+)*3C6H12N2O12P4(8-)*20H2O=Gd4(H4C6H12N2O12P4)3*20H2O

Conditions
ConditionsYield
In water ligand metal ion mole ratio 0.5:0.6; washing, drying in dry air at 25°C;
1,2-ethanediylbistetraphosphonic acid
1429-50-1

1,2-ethanediylbistetraphosphonic acid

gadolinium(III) nitrate

gadolinium(III) nitrate

Gd(3+)*5H(1+)*C6H12N2O12P4(8-)*6H2O=Gd(H5C6H12N2O12P4)*6H2O

Gd(3+)*5H(1+)*C6H12N2O12P4(8-)*6H2O=Gd(H5C6H12N2O12P4)*6H2O

Conditions
ConditionsYield
In water ligand metal ion mole ratio 1.0:1.6; washing, drying in dry air at 25°C;

1429-50-1Downstream Products

1429-50-1Relevant articles and documents

-

Westerback,S. et al.

, p. 2567 - 2572 (1965)

-

Structure-Dependent Dissolution and Restructuring of Calcite Surfaces by Organophosphonates

Nalbach, Martin,Moschona, Argyri,Demadis, Konstantinos D.,Klassen, Stefanie,Bechstein, Ralf,Kühnle, Angelika

, p. 5867 - 5874 (2017)

Organophosphonates are well-known to strongly interact with the surfaces of various minerals, such as brucite, gypsum, and barite. In this work, we study the influence of six systematically varied organophosphonate molecules (tetraphosphonates and diphosphonates) on the dissolution process of the (10.4) surface of calcite. In order to pursue a systematic study, we have selected organophosphonates that exhibit similar structural features, but also systematic architectural differences. The effect of this class of additives on the dissolution process of the calcite (10.4) surface is evaluated using in situ dynamic atomic force microscopy. For all of the six organophosphonate derivatives, we observe a pronounced restructuring of the (10.4) cleavage plane of calcite, demonstrated by the formation of characteristically shaped etch pits. To elucidate their specific influence on the dissolution process of calcite (10.4), we vary systematically the number of functional end groups (two for the tetraphosphonates and one for the diphosphonates), the spacing between the functional ends through separating methylene groups (2, 6, and 12), as well as the pH of the solution (ranging from 2.6 up to 11.7). For each of the two groups of the organophosphonate derivatives, we observe the very same formation of etch pits (olive-shaped for the tetraphosphonate and triangular-shaped for the diphosphonate molecules), respectively. This finding indicates that the number of functional ends decisively determines the resulting calcite (10.4) surface morphology, whereas the size of the organophosphonate molecule within one group seems not to play any important role. For all of the molecules, the restructuring process of calcite (10.4) is qualitatively independent of the pH of the solution and, therefore, independent of the protonation/deprotonation states of the molecules. Our results reveal a general property of organophosphonate derivatives to induce surface restructuring of the calcite (10.4), which seems to be very robust against variations in both, different molecular structures and different protonation/deprotonation states.

METHOD FOR THE SYNTHESIS OF ALPHA-AMINOALKYLENEPHOSPHONIC ACID

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Page/Page column 23, (2014/02/15)

The present invention is related to a new method for the synthesis of alpha-aminoalkylenephosphonic acid or its phosphonate esters comprising the steps of forming a reaction mixture by mixing a P-O-P anhydride moiety comprising compound, having one P-atom at the oxidation state (+111) and the other P-atom at the oxidation state (+111) or (+V), an aminoalkanecarboxylic acid and an acid catalyst, wherein said reaction mixture comprises an equivalent ratio of alpha-aminoalkylene carboxylic acid to P-O-P anhydride moieties of at least 0.2, and recovering the resulting alpha-aminoalkylene phosphonic acid compound or an ester thereof from the reaction mixture.

Green synthesis of poly(aminomethylenephosphonic) acids

Villemin, Didier,Moreau, Bernard,Elbilali, Abdelghani,Didi, Mohamed-Amine,Kaid, Mhamed,Jaffres, Paul-Alain

experimental part, p. 2511 - 2519 (2011/02/28)

The reaction of polyamines with phosphorous acid and formaldehyde in water under focused microwave irradiation provides a facile and rapid synthesis of poly(aminomethylenephosphonic) acids. Taylor & Francis Group, LLC.

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