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Synthesis and spectroscopic properties of new bis-tetrazoles.

Pazik A, Skwierawska A - J Incl Phenom Macrocycl Chem (2012)

Bottom Line: Syntheses of N,N'-phenyltetrazole podands link with aliphatic chains containing oxygen, nitrogen and sulphur atoms, are described.The UV-Vis titrations were performed to estimate the stability constant values of the respective complexes with Cu(2+) ion.The structure of ligand 2 has been deduced by X-ray crystallography.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical Technology, Chemical Faculty, Gdansk University of Technology, 80-233 Gdańsk, Poland.

ABSTRACT
Syntheses of N,N'-phenyltetrazole podands link with aliphatic chains containing oxygen, nitrogen and sulphur atoms, are described. The complexing properties of these compounds towards metal cations (Fe(2+), Cu(2+), Zn(2+), Co(2+), Ni(2+)) were investigated by absorption and infrared spectroscopy. The UV-Vis titrations were performed to estimate the stability constant values of the respective complexes with Cu(2+) ion. Changes in UV-Vis absorption spectra and IR spectra of compound 6 under various concentrations of Cu(2+) ion in methanol suggest formation of very unstable complex. The structure of ligand 2 has been deduced by X-ray crystallography.

No MeSH data available.


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a Mid range FT-IR spectrum (film) of the ligand 2b ligand with FeCl2c ligand with FeCl3
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Fig9: a Mid range FT-IR spectrum (film) of the ligand 2b ligand with FeCl2c ligand with FeCl3

Mentions: In the preliminary experiments we investigate the spectroscopic characterization of the ligand 2 and its complex with ferrous(II) and ferrous(III) chloride. FT–IR Spectra of the ligand and the complexes have been taken within the range of 3500–500 cm−1. The spectra are depicted in Fig. 9. The range between 1700 and 500 cm−1 is particular interesting for us. The bands at 1508, 1473, 1454, 1129 cm−1 are due to combinations of bond stretching vibrations typical for coordinated tetrazole rings (Fig. 9a). The band at 1602 cm−1 is due to stretching vibration of the C=C bond from phenyl rings. The absorption of at 754 cm−1 is typical for bond angle deformation of the substitution tetrazole rings in the phenyl ring. After complexation up-shift of 40 cm−1 can be observed in the spectrum of the complexation attempt with iron(II) and small up-shift of 3 cm−1 for iron(III). The strong absorption at 1602 cm−1 is shifted to the 1642 cm−1. The coordination of the tetrazole N-atom to the iron(II) can be observed through strong force constants of the neighboring bonds from phenyl rings. No changes in the intensities of absorption characteristic for polyether chain can confirm our earlier hypothesis that it is not engaged in complex.Fig. 9


Synthesis and spectroscopic properties of new bis-tetrazoles.

Pazik A, Skwierawska A - J Incl Phenom Macrocycl Chem (2012)

a Mid range FT-IR spectrum (film) of the ligand 2b ligand with FeCl2c ligand with FeCl3
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3824287&req=5

Fig9: a Mid range FT-IR spectrum (film) of the ligand 2b ligand with FeCl2c ligand with FeCl3
Mentions: In the preliminary experiments we investigate the spectroscopic characterization of the ligand 2 and its complex with ferrous(II) and ferrous(III) chloride. FT–IR Spectra of the ligand and the complexes have been taken within the range of 3500–500 cm−1. The spectra are depicted in Fig. 9. The range between 1700 and 500 cm−1 is particular interesting for us. The bands at 1508, 1473, 1454, 1129 cm−1 are due to combinations of bond stretching vibrations typical for coordinated tetrazole rings (Fig. 9a). The band at 1602 cm−1 is due to stretching vibration of the C=C bond from phenyl rings. The absorption of at 754 cm−1 is typical for bond angle deformation of the substitution tetrazole rings in the phenyl ring. After complexation up-shift of 40 cm−1 can be observed in the spectrum of the complexation attempt with iron(II) and small up-shift of 3 cm−1 for iron(III). The strong absorption at 1602 cm−1 is shifted to the 1642 cm−1. The coordination of the tetrazole N-atom to the iron(II) can be observed through strong force constants of the neighboring bonds from phenyl rings. No changes in the intensities of absorption characteristic for polyether chain can confirm our earlier hypothesis that it is not engaged in complex.Fig. 9

Bottom Line: Syntheses of N,N'-phenyltetrazole podands link with aliphatic chains containing oxygen, nitrogen and sulphur atoms, are described.The UV-Vis titrations were performed to estimate the stability constant values of the respective complexes with Cu(2+) ion.The structure of ligand 2 has been deduced by X-ray crystallography.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical Technology, Chemical Faculty, Gdansk University of Technology, 80-233 Gdańsk, Poland.

ABSTRACT
Syntheses of N,N'-phenyltetrazole podands link with aliphatic chains containing oxygen, nitrogen and sulphur atoms, are described. The complexing properties of these compounds towards metal cations (Fe(2+), Cu(2+), Zn(2+), Co(2+), Ni(2+)) were investigated by absorption and infrared spectroscopy. The UV-Vis titrations were performed to estimate the stability constant values of the respective complexes with Cu(2+) ion. Changes in UV-Vis absorption spectra and IR spectra of compound 6 under various concentrations of Cu(2+) ion in methanol suggest formation of very unstable complex. The structure of ligand 2 has been deduced by X-ray crystallography.

No MeSH data available.


Related in: MedlinePlus