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Cas Database

Name

FERROIN

EINECS

N/A

CAS No.

14634-91-4

Density

g/cm³

PSA

165.98000

LogP

8.08930

Solubility

N/A

Melting Point

N/A

Formula

C₃₆H₂₄FeN₆O₄S

Boiling Point

365.1°Cat760mmHg

Molecular Weight

692.537

Flash Point

164.8°C

Transport Information

N/A

Appearance

dark red liquid

Safety

Risk Statements	52/53
Safety Statements	24/25
WGK Germany	-

Risk Codes

52/53-51/53

Molecular Structure

Hazard Symbols

Synonyms

M/40-FERROIN;FERROIN;FERROIN INDICATOR;FERROIN INDICATOR SOLUTION;1,10-PHENANTHROLINE IRON(II) SALT;1,10-PHENANTHROLINE IRON (II) SULFATE;1,10-PHENANTHROLINE IRON(I) SULFATE COMPLEX;1,10-Phenanthroline ferrous

Article Data

FERROIN Synthetic route

: 66-71-7
1,10-Phenanthroline

: Ammonium iron sulfate

: 14634-91-4
ferroin

Conditions

Conditions	Yield
In ethanol; water in situ react.;
In methanol; water not isolated;

: ferrous(II) sulfate heptahydrate

: 66-71-7
1,10-Phenanthroline

: 14634-91-4
ferroin

Conditions

Conditions	Yield
In water FeSO4 and phenanthroline reacted in a 1:3 stoichiometric relationship;
In water added excess of FeSO4*7H2O; not isolated; investigated by Photoelectron Emission Spectroscopy;
In water

: 66-71-7
1,10-Phenanthroline

: ferrous ammonium sulphate

: 14634-91-4
ferroin

Conditions

Conditions	Yield
In not given

: 66-71-7
1,10-Phenanthroline

: 7439-89-6
iron(II)

: 14634-91-4
ferroin

Conditions

Conditions	Yield
In water 1,10-phenanthroline added in 1,10-phenanthroline:Fe ratio of ca. 3:1 todeaerated Fe(2+) soln.;

: 66-71-7
1,10-Phenanthroline

: iron(II) sulfate

: 14634-91-4
ferroin

Conditions

Conditions	Yield
FeS:1,10-phenanthroline, molar ratio 1:3;
In water Prepn. by dissolving stoich. amts. of starting compds. in pure H2O.;
In sulfuric acid stoichiometric amounts; filtered;
In not given
In water

: tris(1,10-phenanthroline)iron(II) perchlorate

: 14634-91-4
ferroin

Conditions

Conditions	Yield
With Na2SO4 In water addn of pptd. educt to water contg. anion exchange resin (equilibrated with Na2SO4); not isolated, spectrophotometric control;

: 14634-91-4
ferroin

: 14768-11-7, 30872-77-6, 80875-80-5, 15334-30-2, 15362-08-0
dicyanobis(1,10-phenanthroline)iron(II)

Conditions

Conditions	Yield
With potassium cyanide In water Fe salt aq. soln. heating nearly boiling, aq. KCN adding at once, stirring, cooling to room temp., dark violet crystals collecting, drying in vacuo; identified by IR, UV spectra;	90%

: 14634-91-4
ferroin

: Na2[Ni(maleonitriledithiolate)2]

: 176735-71-0
Fe(C12H8N2)3(2+)*Ni(S2C2(CN)2)2(2-) = [Fe(C12H8N2)3][Ni(S2C2(CN)2)2]

Conditions

Conditions	Yield
In methanol; water byproducts: Na2SO4; stirring (20 min); filtration, washing (water/ethanol), drying in air; elem. anal.;	50%

: 14634-91-4
ferroin

: 831-59-4
1,3-benzenedisulfonic acid disodium salt

: tris(1,10-phenanthroline)iron(II), m-benzenedisulfonate salt

Conditions

Conditions	Yield
With water In water recrystd. twice from water, air-dried at room temp., water of crystn. determined by Karl-Fischer method;

: 14634-91-4
ferroin

: 1655-45-4
disodium 2,6-naphthalenedisulfonate

: tris(1,10-phenanthroline)iron(II), 2,6-naphthalenedisulfonate salt

Conditions

Conditions	Yield
With water In water recrystd. twice from water, air-dried at room temp., water of crystn. determined by Karl-Fischer method;

FERROIN Chemical Properties

Ferroin(14634-91-4) is the blood-red complex with the formula [Fe(o-phen)₃]SO₄, where o-phen is an abbreviation for 1,10-phenanthroline. Ferroin(14634-91-4) changes from red to pale blue when oxidized. Its redox potential is +1.06 volts in 1M H₂SO₄.
Density: 0.999 g/mL at 25 ℃.
Molar mass: 596.27 g/mol.
Chemical structure:

FERROIN Uses

Ferroin(14634-91-4) is used as an redox indicator in analytical chemistry. [Fe(o-phen)₃]²⁺ ion is the active ingredient, and it is the redox-active chromophore. It includes other salts of the same basic dication. It can be prepared for ferroin indicator solution. It cannot be used as an indicator in perchloric acid medium because of precipitation of ferroin perchlorate.

FERROIN Production

A solution of 1.485 g 1,10-phenanthroline monohydrate is added to a solution of 695 mg FeSO₄^.7H₂O in water, and the resulting red solution is diluted to 100 mL.
Ferroin sulfate may be prepared simply by adding phenanthroline to ferrous sulfate in water.
3 phen + FeSO₄ → [(o-phen)₃Fe]SO₄ .

FERROIN Safety Profile

Ferroin(14634-91-4) is harmful to aquatic organisms. It may cause long-term adverse effects in the aquatic environment. It is irritant to skin and eye, so it should avoid contacting with skin and eyes. It is hazardous to lungs, mucous membranes, liver. This material and its container must be disposed of as hazardous waste.

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