Novel thiadiazole-based Schiff base ligand (L) and their Co(II), Ni(II), Cu(II) and Zn(II) metal complexes have been prepared and characterized using elemental analysis, IR, 1 H-NMR, 13 C-NMR, UV-vis spectroscopy, EPR, thermal analysis, magnetic moment and conductometric measurements. Based
Using an iterative technique to obtain the exact solutions of the cubic Christoffel equation, the 21 elastic constants of copper sulphate pentahydrate have been determined at 25°C by the ultrasonic pulse echo method. The elastic constants, referred to the IRE recommended system of axes, are c11=5·65, c12=2·65, c13=3·21, c14=−0·33, c15=−0·08, c16=−0·39, c22=4·33, c23=3·47, c24=−0·07, c25=−0·21, c26=0·02, c33=5·69, c34=−0·44, c35=−0·21, c36=−0·16, c44=1·73, c45=0·09, c46=0·03, c55=1·22, c56=−0·26 and c66=1·00 in units of 1010 N m−2.
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