Synthesis, X-ray Crystal Structure and Solution Studies of Cu(II) Complexes of a Pyridine Containing Self-Assembling System

• Autorzy: Ranjbar M. , Taghavipur M. , Aghabozorg H. , Moghimi A. , Jalali F. , Shamsipur M.
• Języki publikacji: EN

Abstrakty

EN

The complexation of a novel pyridine containing self-assembling system LH2, ([pyda_H2] [pydc] (pyda = 2,6-pyridinediamine and pydc_H2 = 2,6-pyridinedicarboxylic acid), with copper(II) acetate leads to the formation of an anionic self-assemble coordination compound, [(pyda_H)]2[Cu(pydc)2]_H2O. The crystal system is monoclinic with a space group P21/n and contains four molecules per unit cell. The unit cell dimensions are: a = 8.2567(19) A, b = 13.097(31) A, c = 23.384(6) A and _ = 94.685(5)_. The four carboxylate groups of two dianions are oriented in a flattened tetrahedral arrangement and the two dianionic units are almost perpendicular to each other. The axial N-Cu-N angle shows 2.65_ deviation from linearity. The complexation reactions in aqueous solution were investigated by potentiometric pH titrations and the equilibrium constants for all major complexes formed are described. The results are presented in the form of distribution diagrams revealing the concentration of individual complex species as a function of pH. The results revealed that, at pH = 4-5, the major complex species in solution is [(pyda_H)]2[Cu(pydc)2].

Słowa kluczowe

EN

self-assembling system; crystal structure; Cu(II) complex; potentiometri pH titrations

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2002
• Tom: Vol. 76 / nr 6
• Strony: 785--794
• Opis fizyczny: Bibliogr. 12 poz., rys.

Twórcy

autor

Ranjbar M.

• Department of Chemistry, University of Tarbiat Moallem, Tehran, Iran

autor

Taghavipur M.

• Department of Chemistry, University of Tarbiat Moallem, Tehran, Iran

autor

Aghabozorg H.

• Department of Chemistry, University of Tarbiat Moallem, Tehran, Iran

autor

Moghimi A.

• Department of Chemistry, University of Imam Hossein, Tehran

autor

Jalali F.

• Department of Chemistry, University of Imam Hossein, Tehran

autor

Shamsipur M.

• Department of Chemistry, Razi University, Kermanshah, Iran

Bibliografia

• 1. Zafar A., Geib S.J., Hamuro Y., Carr AJ. and Hamilton A.D., Tetrahedron, 56, 8419 (2000).
• 2. Moghimi A., Ranjbar M., Aghabozorg H., Jalali F., Shamsipur M., Yap G.P.A. and Rahbamoohi H., J. Mol Struct., 605, 133 (2002).
• 3. Schmuck C„ Eur. J. Org. Chem., 2397 (1999).
• 4. MacDonald J.C., Dorrestein P.C., Pilley M.M., Foote M.M., Lundburg J.L., Henning R.W., Schultz A. J. and Manson J.L., J. Am. Chem. Soc., 122, 11692 (2000).
• 5. SAINT+. Software for data reduction for CCD detector system. Bruker X-ray Analytical Instruments, Madison, WI, 1995.
• 6. Sheldrick G.M., SHELXTL, V. 5.1530, Bruker AXS Inc., Madison, WI-53719, 1997, USA.
• 7. Schwarzenbach G. and Flaschka H., Complexometric Titrations, Methuen, London, 1969.
• 8. Martell A.E. and Motekaitis R.J., Determination and Use of Stability Constants, 2nd ed., VCH, NY, 1992.
• 9. Cingi M.B., Villa A.C., Guastini C. and Nardelli N., Gazz. Chim. Ital., 102, 1026 (1972).
• 10. Cingi M.B., Villa A.C., Guastini C. and Nardelli N., Gazz. Chim. Ital., 101, 825 (1971).
• 11. Nakamoto K., Infrared and Raman Spectra of Inorganic and Coordination Compounds , Part B, 5th ed., NY, 1997.
• 12. du Preez J.G.H. and van Brecht B.J.A.M., J. Chem. Soc., Dalton Trans., 253 (1989).