1. Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, Department of Chemistry, University of Southern Mississippi, Hattiesburg, Mississippi 39406, Bruker Daltonics, Billerica, Massachusetts 01821, and Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, c/Marcel·lí Domingo s/n, 43007 Tarragona, Spain