Synthesis and X-Ray Crystallographical Analysis of 5, 8-Dihydroxy-1, 4-Naphthoquinonne, Cobalt (II), Nickel (II) and Copper (II) Chelate Complexes.

The complexes of Co (II), Ni (II), Cu (II) and 5, 8-dihydroxy-1, 4-naphthoquinone were prepared in an effective way of low cost and high yield using simple inexpensive catalyst (urea hydrogen peroxide) and a base t-BuOK. The polymetallic chelates of naphthazarin with cobalt (II), nickel (II) and copper (II), {[(C10H6O4)3 (Co)2 4H2O] 3H2O, [(C10H6O4)3 (Ni)2 4H2O]1½H2O, [(C10H6O4)3 (Cu)2] 4H2O} have been crystallographically defined and analysed applying the diffractograms data on the systems involved. The X-ray data helped settle on the cubic P lattices of all the polymetal chelates in preference to cubic F cubic I. The study further included the calculations on the interplaner spacing (dÅ), density, unit cell (aÅ) in which it had been found that dÅ gets decreased with increasing value of n. The (aÅ) for polycobalt chelate was the highest followed by polycopper and polynickel chelates, and the density values on these polymetal chelates assumed the similar order. The molecular weights of these chelate complexes show aligns with their formula weights. [ABSTRACT FROM AUTHOR]