SYNTHESIS AND INVESTIGATION OF COORDINATION COMPOUNDSOF Co(II) ION WITH 2-HYDROXY-1-NAPHTHALDEHYDE AND 1,2-PHENYLENEDIAMINE (N.A. Izatillayev, F.B. Eshkurbonov, P.J. Tojiyev, J.A.Bakirov, A.A. Ashurova, S.B. Eshkurbonov, R.I.Abdullaeva, A.Kh. Rakhimov, & N.Kh. Karshiyev , Trans.). (2026). Spectrum of Engineering and Management Sciences, 4(1), 89-95. https://doi.org/10.5281/zenodo.21466707