1. A. Yacouta-Nour, T. Maki and M. M. Mostafa,Spectrochim. Acta,44A, 1291 (1988).
2. A. G�l and �. Bek�ro?u,J. Chem. Soc. Dalton. Trans., 2537 (1983).
3. A. Kocak and �. Bek�ro?u,Synth. R Chem.,14, 753 (1984).
4. M. Kocak and �. Bek�ro?u,Synth. R Chem.,15, 479 (1985).
5. A. G�l, A. I. Okur, A. Cihan, N. Tan and �. Bek�ro?lu,J. Chem. Res. (S), 90 (1986).