this presentation useful for discussing #chemical and #physical property and application of .. #Manganese(III)acetylacetonate #Manganicacetylacetonate #3-Penten-2-one,4-hydroxy-,manganese(3+) salt #Mangan(3+)tris[(2Z)-4-oxo-2-penten-2-olat] #3-Penten-2-one,4-hydroxy-,manganese(3+)salt,(3Z)-(3:1) in this I discuss chemical and physical property, #spectra, application, #harmness etc

1. :
Presented by

2. Tris(acetylacetonato)manganese (III) is one of numerous
organometallic compounds. Other name of this compound is
Manganese(III) acetylacetonate
Manganic acetylacetonate
3-Penten-2-one, 4-hydroxy-, manganese(3+) salt
Mangan(3+)tris[(2Z)-4-oxo-2-penten-2-olat]
3-Penten-2-one, 4-hydroxy-, manganese(3+) salt, (3Z)-
(3:1)
General formula: Mn(acac)3

3. :
 Structure: distorted octahedral structure (JTD)
 Point group: → d3 pseudo Oh symmetry
 melting point: 159-161 °C not sharply
 Decomposed start at above 150 oC
 Boiling point: 187-188 °C
 Molecular waight: 352.28 g/mol
 Colour: black to dark brown by reflected light
green by transmitted light
 Molecular formula: C15H24MnO6
 Compound is Canonicalized
 Soluble in benzene, chloroform,
ethyl acetate and less soluble in water
 One electron oxidant

4.  Oxidation state of cental metal (Mn)= +3
 Coordination number = 6
 Electronic configuration of Mn3+ = [Ar]3d4
 Hybridization of complex= sp3d2
 Structure: octahedral
 Orbital of metal that are present in hybrization is
 Type of ligand = –ve charge bidentad ligand (weak field
ligand)
 Number of unpair electron in central metal =4
4S 4px 4py 4pz
4dx
2
-y
2
4dz
2

5. Orbital in Mn3+
:
:
:
:
:
:
acac ligand
4s 4px 4py 4pz
4dx2-y2
4dz2

6. O
OH
+ B
O
O
+ BH
O
O
HAcac Acac
Synthesis of ligand
Ligand
O
O
O
O
Acac is bidented ligand with resonance form
so this is AA type ligand

7.  Oxidation state of cental metal (Mn)= +3
 Electronic configuration of Mn3+ = [Ar]3 d4
 Type of ligand= weak field ligand
 type of complex= high sspin complex
 Number of unpair electron= 4
 Possible transition= d-d transition eg
 It show jtd
t2g
Cfse value =
3/5

8. 3p
t2g
eg

9. 5D
5Eg
5T2g

10. potassium
permanganate
acetylacetone
distilled water
potassium
permanganate
manganese(II)
chloride
acetylacetone
sodium acetate
trihydrate
Distilled water
potassium
permanganate
acetylacetone
manganese(II)
chloride
Distilled water
potassium
permanganate
acetylacetone
MnSO4
Distilled
water

11. dark shiny crystals of Mn(acac)3 was filtered off.
dried in vacuum over fused CaCl2 for 15
minutes
Mn(acac)3 synthesized
distilled acetylacetone are mix in solution with continuous stirring.
A white crystalline precipitates were
observed
cool down the solution
5 g of KMnO4 in 50 mL of distilled water with continuous stirring
Give heat Solution ready
KMnO4 + 4(Hacac) → [Mn(acac)3] + 2H2O + Kacac + O2

12. sodium acetate trihydrate (2.6 g dissolved in a minimal amount of water) to the reaction mixture.
Heat the resulting mixture directly on a
hotplate for 10 minutes at about 70°C
cool at room temperature Collect the dark
brown precipitate using a Büchner funnel
Make another solution of 200 mg of KMnO4 in 10 mL of distil water, with continue stirring
add the solution dropwise to the mixture of
MnCl 2•4H2O and sodium acetate trihydrate.
stirring the mixture five minutes
1.0 g of MnCl2•4H2O and 2.6 g of sodium acetate trihydrate desolve in minimum ammount of
distil water
continuous stirring
Solution ready 4.0 mL of acetylacetone with
continued stirring.
4MnCl2 + 15HC5H7O2+ KMnO4+ 4NaC2H3O2  5Mn(C5H7O2)3 + KC2H3O2 +4NaCl

13. dark shiny crystals of Mn(acac)3 was filtered off.
dried in vacuum over fused CaCl2 for 15
minutes
Mn(acac)3 synthesized
1.7g acetylacetone and 0.4 g Mn(Cl)2 are mix in solution with continuous stirring.
A white crystalline precipitates were
observed
cool down the solution
0.1 g of KMnO4 in 50 mL of distilled water with continuous stirring
Give heat Solution ready
4MnCl2.4H2O + KMnO4 + 15(Hacac) → 5[Mn(acac)3] + 20H2O + 7HCl + KCl

14. dark shiny crystals of Mn(acac)3 was filtered off.
dried in vacuum over fused CaCl2 for 15
minutes
Mn(acac)3 synthesized
7.5g acetylacetone and 2g MnSO4 are mix in solution with continuous stirring.
A white crystalline precipitates were
observed
cool down the solution
Give heat Solution ready

15.  (i) the presence of strong absorption bands (peaks nos. 14, 15, and 16) at 1588, 1514.8, and
1384.6 cm-1 respectively (C–O, carboxylate),
 (ii) peak no. 23 at 753.5 cm-1,
 (iii) peak no. 26 at 565 cm-1 (Mn–O, stretching).

16. NMR data of Mn(acac)3

17.  the metallic content of Mn% in solid crystals of product was 14.7%, as confirmed
by EDXRF, whereas
 the organic carbon content was 50.21% as analyzed by the elemental
analysis showed the EDIX chart for produced crystals

18. Application
of
Mn(acac)3
Synthesis of
other Mn3+
salt
Organic
synthisis
polymersition
Polarographic
data
Electronics
davise as
cell
Voltammeteric
data

19. Mn(acac)3 is a useful starting material for the preparation of
other Mn(III) compounds.
Mn(acac)3 is 1 electron oxidant so its used to oxidize
phenols, β-dicarbonyl compounds, and thiols to the
corresponding radical. example

20. Mn(acac)3 has been used for the intramolecular oxidative coupling examples
Mn(acac)3 induces the oxidative cyclization of a phenolic oxime to give the
spiroisoxazoline in 50% yield

21. 2-naphthol is oxidized to 2,2-binaphthol in 69% yield in acetonitrile or carbon disulfide
Peroxy hemiacetals are prepared by oxidative addition of Mn(acac)3 to alkenes in the
presence of oxygen
Application

22. The Mn(acac)3 complex can be oxidized to [Mn(acac)3]+ and
reduced to [Mn(acac)3]− at a glassy carbon electrode.
Mn(III)(acac)3 + e− ↔ [Mn(II)(acac)3] −
E = −0.4 V
Mn(III)(acac)3 ↔ [Mn(IV)(acac)3] + + e−
E = 0.7 V
Half cell potential of Mn(acac)3 in different solvent
solvent Half cell potential
Tetrahydrofurane (THF) 1.22
Methanol (MeOH) 1.30
Dichloromethane (DCM) 1.30
Propylenecarbonate (PC) 1.45
Acetonitrile (CH3CN) 1.49
N,N-Dimethylformamide
(DMF)
1.2
Application

23. Mn(acac)3 creat free radical who starts polymerisation
The sensitivity of the half-wave potentials of Mn(acac)3 to'the addition of salts
necessitated a special technique in obtaining polarographic and voltammetric data.
Application

24. Other reaction using Mn(acac)3
Application

25.  Harmful if swallowed [Warning Acute toxicity, oral]
 Causes skin irritation [Warning Skin
corrosion/irritation]
 Causes serious eye irritation [Warning Serious eye
damage/eye irritation]