ZINC-SALEN COMPLEX Synthesis And Characterization

1. ZINC-SALEN COMPLEX
Synthesis And Characterization
By Maitreyi Kaushik

2. Agenda
History and
Importance of
Coordination
Complexes
Brief discussion
Introduction
Coordination
Chemistry of Zinc
And
Salen ligand
Synthesis
Procedure
Reaction involved
Results and
Characterization
Colour
Stability
Solubility
FT-IR
1H-NMR
UV-Visible
TGA
Materials
Required
Names
Quantity

3. Coordination Complexes
Alfred Werner

4. Coordination Chemistry of Zinc
Colour ● Colourless
Nature of
Complexes
● Tetrahedral
● Octahedral
● Five and seven
coordinated
Electronic
Configuration
of Zn2+
● [Ar]3d10

5. Introduction to Salen Ligand
Tetradentate 2 N-atoms and 2 O-atoms
Complexation Leads to stabilization and increased solubility
Catalytic
Activity
Bulky group
Applications Food industry, Cancer treatment, Anti-virus agent

6. Materials
Required
● Zinc Acetate
○ 2 mmol or 0.44 g
● Methanol
○ 20 mL
● Salen ligand
○ 2 mmol or 0.54 g

7. Procedure
Zinc Acetate Solution
(Solution A)
2 mmol Zinc acetate was
taken and it was dissolved
in 10 mL hot methanol.
Ligand Solution
(Solution B)
10 mL methanolic solution
of the 2 mmol ligand was
prepared.
Reaction Mixture
Solution A was added to
Solution B dropwise. The
mixture was then kept for
reflux for 1 hour.
Crude Product
After 1 hour, the mixture
was concentrated and
cooled to obtain the final
product. The product was
filtered and washed with
water and methanol and
dried in air.

8. Reaction Involved

9. Results and Discussion
Colour of the
Product
Green
Stability
Constant
5.426 in aqueous
methanol solution
(25°C)
Tetra-
coordinated
Metal:ligand
is
2:2
Solubility
Soluble in DMSO

10. CHARACTERIZATION
FT-IR
UV-Visible
Thermogravi
metric
Analysis
1H-NMR

11. FT-IR
INSTRUMENTATION

12. Reference: Kazemi, Ali & Salavati-Niasari, Masoud & Khansari, Afsaneh. (2012). Solvent-less synthesis of zinc oxide
nanostructures from Zn(salen) as precursor and their optical properties. Particuology. 10.
10.1016/j.partic.2012.03.006.
600
460
3400 (br)
2944
1550
1600
FT-IR of Salen vs Zn(Salen)
4000 3000 2000 1000
Wavenumber cm-1
Salen
Zinc (Salen)

13. 1H-NMR

14. 1H-NMR Spectrum of Salen and Zn(Salen)
8.5 7.28- 6.82
3.9
Reference: Kazemi, Ali & Salavati-Niasari, Masoud & Khansari, Afsaneh. (2012). Solvent-less synthesis of zinc oxide
nanostructures from Zn(salen) as precursor and their optical properties. Particuology. 10. 10.1016/j.partic.2012.03.006.
13.23 (br s, 2H, OH)
6.9–7.4
8.58
4.0
Salen
Zinc (Salen) CDCl3
400 MHz

15. UV-Visible Spectrometer

16. UV-Visible Spectroscopy of Zn(Salen)
Reference: Nishal et al., Cogent Chemistry (2015), 1: 1079291

17. Thermogravimetric Analysis Apparatus

18. Thermogravimetric Analysis of Zn(Salen)
Reference: Nishal et al., Cogent Chemistry (2015), 1: 1079291