SYNTHESIS, CHARACTERIZATION, DEHYDRATION, SOLID-STATE CONDUCTANCE ANDBIOLOGICAL-ACTIVITY OF CHROMIUM(III) BENZOYLHYDRAZINE AZIDE SULFATE COMPLEXES

A series of chromium(III) benzoylhydrazine azide/sulphate complexes of the type Cr(BH)x(N3)y(SO4)3-y.6H2O where BH = benzoylhydrazine, C6H5C ONHNH2, and x, y = 1-3 have been prepared and characterized by element al analyses, weight loss, IR and electronic spectra, solution and soli d state conductance and magnetic susceptibility data. The complexes ar e paramagnetic and have octahedral stereochemistry with BH bonds to Cr (III) through >C=O and -NH2 groups. N3- and SO4-- groups are ionically associated. Dehydration studies show stepwise elimination of water mo lecules. The molar conductance values of some of the complexes are low . Solid state conductance between 1.4 x 10(-8) to 18.16 x 10(-8) (ohm cm)-1 varying with the number of N3- groups and frequency, indicates a semi-conducting nature of the complexes at room temperature. BH, NaN3 , K2SO4Cr2(SO4)3.24H2O and four of Cr(III) complexes were screened aga inst Synechococcus cedrorum, a unicellular non-nitrogen fixing, mesoph ilic blue green alga, and have shown significant inhibition of chlorop hyll - a, carotenoids, phycocyanin, carbohydrate, protein and biomass production. The following trends have been observed NaN3 < BH < K2SO4C r2(SO4)3.24H2O < Cr(BH)2(N3)21/2SO4.6H2O, Cr(BH3)3(N3)(SO6).6H2O < Cr( BH)3(N3)2.1/2SO4.6H2O < Cr(BH)3(N3)3.6H2O.