eng Ansari Education and Research Society Journal of Ultra Chemistry 0973-3450 2319-8036 June 2005 1 1 17 20 juc 859 article Maneesh Dave 1 Ashutosh Mishra 1 School School of Physics, Devi Ahilya Bai University, Khandwa Road, Indore - 452017 (INDIA) <p style="text-align: justify;">X-ray K-absorption spectra of some copper (II) complexes of newly synthesized mannich bases of biological interest have been studied using Seifert X-ray generator and Cauchois type bent crystal X-ray spectrogroph of 0.4m radius. The observed X-ray parameters, <em>e g.</em> chemical shift, shift of principal absorption maximum, edge-width, effective nuclear charge and percentage covalency have been used to explain the structure of the complexes, and these parameters are sensitive to the topological structure of coordinating iigands, so that they can be successfully used for with Randic index.</p> https://journalofchemistry.org/paper/859/ xanes Randic Index