A Study of the Variable-Temperature Magnetic Susceptibility of Two Ti(III) Oxalate Complexes.
VERMONT UNIV BURLINGTON DEPT OF CHEMISTRY
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Variable-temperature magnetic susceptibility data have been obtained for polycrystalline samples of two TiIII oxalate complexes, Ti2C2O43 H2O6.4H2O and Ti2C2O43H2O5. The bridging oxalate dianion in the former complex a seven-coordinate dimer with D5h symmetry provides an effective path for magnetic exchange between the two TiIII ions as evidenced by a rather large intramolecular exchange parameter J -60cm. The partially dehydrated complex, by contrast, exhibits weak intradimer magnetic exchange interactions. Indeed, the variable-temperature magnetic susceptibility data for Ti2C2O43H2O5 were fit to a distorted-octahedral, single-ion, spin-orbit coupling magnetic model with delta ground term splitting 300cm and K orbital reduction factor 0.7 with gamma 155cm. Room-temperature optical spectra of Ti2C2O43H2O6.4H2O and Ti2C2O43H2O5 were recorded and the resulting band assignments are consistent with D5h and distorted octahedral ligand-field symmetries, respectively. Author
- Physical Chemistry