[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA
[2] CNRS, ICMCB, Pessac, France
[3] Univ Bordeaux, ICMCB, Pessac, France
[4] CNRS, CRPP, Pessac, France
[5] Natl High Magnet Field Lab, Tallahassee, FL 32310 USA
[6] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA