Standard Enthalpies of Formation for Solid Complexes of Chromium Chloride with L—α—Amino Acids

摘要

The solid complexes of Cr(AA)2Cl3·nH2O of CrCl3 with L-α-amino acids(AA=Val,Len,Thr,Met,Arg,Phe,Try and His)have been prepared in 95?EtOH medium,and characterized structurally by elemental analysis,chemical analysis,IR spectra and TG-DTG.The constant-volume combustion energies of the complexes have been determimed by RBC-Ⅱtype rotating-bomb calorimeter.The standard enthalpies of formation of the complexes have been calculated as well,hwich are (-2543.16±3.71)(Val),(-2561.32±4.06)(Leu),(-2284.02±2.95)(Thr),(-1418.77±4.60)(Met(,(-3218.91±4.67)(Arg),(-2643.90±5.02)(Phe),(-1707.18±3.23)(Try)and(-2838.05±3.45)(His)kJ/mol,respectively.