| Abstract: Five new mixed ligand complexes of the type Cr(β-dik)Cl2py2,where β-dik = acetylacetone(acac),benzoylaceione(bzac), trifluoroacetylacetone(tfac), thenoyltrifluroacetone (tta), dibenzoyl-methane (dbm), py = pyridine, have been prepared. The electronic spectra from 300nm to 900nm were recorded and assignments of 4A2g←4A2g, were made. The ligand field parameter Dq value was calculated and compared with the values obtained by the rule of average environment Their IR spectra were measured from 400cm-1 to 2000cm-1. The assignment of stretching freguencies of C_O, C_C, Cr(Ⅲ)-Oand py ring vibration in there mixed ligand complexes were made.Two new coordination compounds Cr(pmbp)3 and Cr(pmbp)Cl2 (thf) also have been prepared,, According to molecular weight determination, it is revealed that the mixed complexes Cr(pmbp)Cl2 (thf) in the chloroform solution has oligomeric nature. According to thermo-analytical studies under atmosphere,it is revealed that the mixed liqand complexes decomposes by two steps.the first decomposition product may be polymerized Cr(pmbp)Cl(OH), the final product is Cr2O3. The Dq values of Cr(pmbp)Cl2 (thf) is between the corresponding values of Cr(pmbp)3 and CrCl3(thf)3, the IR stretching bands can be considered by overlap of corresponding bands for Cr(pmbp); and Cr(thf)3. |
