The Malaysian Journal of Analytical Sciences Vol 11 No 1 (2007): 105 – 109

 

 

FLUORESCENCE CHARACTERISTIC OF 2-CHLOROPYRAZINE:

EFFECT OF SOLVENTS AND CONCENTRATION OF Cu(II)

 

Z. Aiyub, Z. Abdullah, B. H. Yaakob and M.A. Abu Bakar

 

Chemical Synthesis and Modelling Research Group, Department of Chemistry,

Unversity of  Malaya, 50603, Kuala Lumpur

 

Abstract

2-Chloropyrazine showed the highest fluorescence peak at 328 nm when excited at 290 nm in ethyl acetate.   The intensity was reduced in chloroform, ethanol, acetone, dichloromethane, water and the lowest fluorescence intensity was observed in acetonitrile.   The fluorescence characteristic of 2-chloropyrazine with different  concentrations of copper (II) nitrate was studied as a function of the metal ion complex. The studies were  carried out in ethanol and ethyl acetate in the same concentration  and  the  maximum  fluorescence  was  observed  in  ethyl acetate. When excited at 287 nm in ethanol, the complex emitted intense fluorescence  at  two wavelengths around 304-308 nm and 569-572 nm while in ethyl acetate it fluoresced at 327-332 nm and 651-647 nm when excited at 290 nm.  The pattern of increase and decrease of fluorescence intensity  depends on the  concentration of Cu(II) added.   At a  concentration of  9.93 x 10^-5  M  of Cu (II),  fluorescence intensity decreased in both solvents.

 

Keywords: fluorescence, 2-chloropyrazine, copper(II) nitrate, metal effect, fluorescence intensity.

 

References

1.         S.G. Schulman and A.C. Capomacchia, Anal. Chim. Acta, 1972, 58, 91.

2.         S.G. Schulman, J. Pharm. Sci., 1971, 60, 371.

3.         H.C. Borresen, Acta Chem Scand., 1965, 17, 921.

4.         Y. Watanabe & K. Imai, Anal Biochem ., 1981, 116, 471.

5.         I. Saito & Z. Abdullah, Malays. J. Anal. Sci, 1996, 2(2), 373.

6.         Z. Abdullah, N. Mohd Tahir, M.R. Abas, A. Ariffin, Malays. J. Anal. Sci., 1995, 1(1), 167.

7.         Z. Abdullah, N.M. Waldron, ACGC Chem. Comm., 1996, 4, 67.

8.         Z. Abdullah, N. Mohd Tahir, M.R. Abas, B.K.Low, Malays. J. Anal. Sci., 1996, 4(1), 417.

9.         Z. Abdullah, N.M. Waldron, Kimika, 1997, 13(1), 1.

10.      Z. Abdullah and Z.Aiyub, Malays. J. Anal. Sci., 2005, 9(1&2), 319-324.

11.      Z. Abdullah, N. Mohd Tahir, M.R. Abas, Z.Aiyub, B.K. Low, Molecules, 2004, 9, 520.

12.      Z. Abdullah, M.A.A. Bakar, M.A.M. Shariffudin and Z.Aiyub, Jour. Ultra Chem . 2005, 2(1), 49-54.

13.      Z. Aiyub, Z. Abdullah, B. Hanan, Proceedings of Annual Fundamental Science Seminar 2006.

14.      E. U. Akkaya, M. E. Huston, and A. W. Czarnik (1990) J. Am. Chem. Soc. 112, 3590.

15.      I. Mori, Y. Fujita, M. Toyoda, M. Hamada, and M. Akagi (1992) Fresenius J. Anal. Chem. 343, 902.

16.      K. Rurack, U. Resch, M. Senoner and S. Dahne, Jour. of Fluo, Vol. 3, No. 3, 141-143, 1993.

17.      A. Janowski and N. Sadlej, J. Lumin. 3, 198, 1970.

18.      Zanariah Abdullah, Ernie Iryana Awang Din, Nadiah Rifhan Abd. Rani, Maizatul Akmam A. Bakar and Zaharah Aiyub, Proceedings of Annual Fundamental Science Seminar 2006.

19.      K. V. Wood, Y.A. Low and W.D. J.McElvacy, Biolum. Chemilumin.,(1989), 4, 289.

20.      I. Falment and M.Stool, Helv. Chim. Acta, (1967), 1754.

21.      R.H. Bradbury, D. Griffins and J. E. Rivett, Heterocycles , (1990), 31, 1647.

22.      S. A. Harouounian and J. A. Katzenellenbogen, Tetrahedron, (1995), 51(6), 1585.

23.      Stephen G. Schulman,  Fluorescence and Phosphorescence Spectroscopy: Physicochemical Principles  and  Practice, Pergamon Press, New York, 1977.