Transition metal complexes of various acetylacetone based ligands of the type ML [where M= Cu (II), Ni (II), Co (II); L= 3-(aryl)-pentane-2, 4-dione] have been synthesized. The structural features have been derived from their elemental analysis, magnetic susceptibility, molar conductance, IR, UV–Vis, 1H NMR, Mass and ESR spectral studies. Conductivity measurements reveal that all the complexes are non-electrolytic in nature. Spectroscopic ...